4.7 Article

Sequence of enthalpy relaxation, homogeneous crystal nucleation and crystal growth in glassy polyamide 6

Journal

EUROPEAN POLYMER JOURNAL
Volume 53, Issue -, Pages 100-108

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2014.01.012

Keywords

Polyamide 6; Enthalpy relaxation; Crystal nucleation; Crystal growth

Funding

  1. Deutsche Forschungsgemeinschaft (DFG) [AN 212/9]

Ask authors/readers for more resources

The sequence of densification/enthalpy relaxation, crystal nucleation and crystal growth in glassy polyamide 6 has been quantified using fast scanning chip calorimetry. The melt was vitrified by fast cooling, and then the glass was annealed as a function of temperature and time, covering a time scale of six orders of magnitude, required to separate the individual relaxation/ordering processes. During annealing of the glass, there is first observed enthalpy relaxation, and only after its completion there is detected crystal nucleation followed by crystal growth. A homogeneous nucleation mechanism is suggested. In such case, the characteristic relaxation time of the glass to attain metastability, that is, of its densification, has been shown theoretically (Gutzow and Schmelzer, 2013) to be as a rule much shorter than the characteristic time of nucleus formation. (C) 2014 Elsevier Ltd. All rights reserved.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

Article Chemistry, Physical

Crystal nucleation in Au49Ag5.5Pd2.3Cu26.9Si16.3 glass and undercooled melt

Luojia Zhang, Evgeny Zhuravlev, Jun Yi, Qijie Zhai, Christoph Schick, Yulai Gao, Bingge Zhao

Summary: Crystal nucleation is a crucial step in the crystallization of metallic glasses. However, the nucleation kinetics can deviate from the classical nucleation theory as the undercooling increases. This study examines the nucleation kinetics in glass and undercooled melt using nanocalorimetry. By varying the cooling rate, the processes of crystallization, homogeneous nucleation, and heterogeneous nucleation are distinguished. The critical cooling rates for suppressing crystallization and nucleation are estimated, and a well-identified amorphous phase is produced for nucleation studies. The underlying kinetic mechanism is revealed through the analysis of crystallization heat and overall heat using the Johnson-Mehl-Avrami method.

JOURNAL OF ALLOYS AND COMPOUNDS (2023)

Article Materials Science, Ceramics

Differential scanning calorimetry investigation of crystallization kinetics and glass-forming ability of sulfonamides

Semen E. Lapuk, Marat A. Ziganshin, Radik A. Larionov, Timur A. Mukhametzyanov, Christoph Schick, Alexander V. Gerasimov

Summary: Robust determination of parameters governing the stability of amorphous drugs is crucial in modern pharmaceutics. The kinetic stability of these systems greatly impacts their practical applications. This study determined the critical cooling rates and kinetic parameters of cold crystallization for four slowly crystallizing sulfonamides. The Nakamura crystallization model demonstrated good prognostic ability by determining the stability time profile of drug systems prone to crystallization from non-isothermal thermokinetic data.

JOURNAL OF NON-CRYSTALLINE SOLIDS (2023)

Article Thermodynamics

Vapor Pressure Measurements for Acetanilide and Its Derivatives by Fast Scanning Calorimetry

Aleksey V. Buzyurov, Ruslan N. Nagrimanov, Timur A. Mukhametzyanov, Marat A. Ziganshin, Boris N. Solomonov, Christoph Schick

Summary: The vapor pressures and enthalpies of sublimation/vaporization/fusion were measured for acetanilide and eight derivatives. The obtained vapor pressures resolved contradictions in the literature and confirmed previous values for certain compounds. Sublimation and vaporization enthalpies were determined and mostly agreed with literature values. Fusion enthalpies of certain compounds were determined using different methods and showed consistency with literature values.

JOURNAL OF CHEMICAL AND ENGINEERING DATA (2023)

Article Polymer Science

Vitrification of the Entire Amorphous Phase during Crystallization of Poly(butylene terephthalate) near the Glass-Transition Temperature

Akihiko Toda, Yoshitomo Furushima, Christoph Schick

Summary: In this study, the isothermal crystallization kinetics of poly(butylene terephthalate) at low temperatures near the glass transition was investigated using chip-sensor fast scanning calorimetry. The Avrami analysis showed that the Avrami index decreased from 4 to less than 2 in the low-temperature peak of the crystallization rate, resulting in significantly low crystallinity near the glass-transition temperature. This phenomenon was attributed to the inhibition of crystal growth by the rigid amorphous fraction (RAF) that is constrained by crystals, as proposed by Schawe for other crystalline polymers. The transformation of the mobile amorphous fraction (MAF) into RAF with the progress of crystallization was confirmed near the glass-transition temperature, leading to the rigidification of all amorphous fractions.

MACROMOLECULES (2023)

Article Medicine, Research & Experimental

Kinetic Stability and Glass-Forming Ability of Thermally Labile Quinolone Antibiotics

Semen E. Lapuk, Timur A. Mukhametzyanov, Christoph Schick, Alexander Gerasimov

Summary: The application of drugs in the amorphous state is being actively researched in pharmaceutical science to enhance their bioavailability. In this study, the kinetic stability and glass-forming ability of thermally labile quinolone antibiotics were investigated using fast scanning calorimetry. The critical cooling rates for preventing crystallization of oxolinic acid, pipemidic acid, and sparfloxacin were determined to be 10,000, 40, and 80 K·s-1 respectively, indicating their strong glass-forming ability. The Nakamura model was found suitable for describing the crystallization process of the amorphous forms of the quinolone antibiotics using a combination of nonisothermal and isothermal kinetic approaches.

MOLECULAR PHARMACEUTICS (2023)

Article Chemistry, Multidisciplinary

Mesoscopic Effects of Interfacial Thermal Conductance during Fast Pre-Melting and Melting of Metal Microparticles

Alexander Minakov, Christoph Schick

Summary: This article studies the influence of various mesoscopic effects on interfacial thermal conductance (ITC) during fast melting processes and the contributions to ITC in pre-melting and melting processes of metal microparticles. The gained knowledge is useful for understanding and optimizing technological processes involving fast melting, such as laser additive manufacturing.

APPLIED SCIENCES-BASEL (2023)

Article Chemistry, Multidisciplinary

New Polymorph of Indomethacin: Screening by Solid-State Guest Exchange and Characterization Using Fast Scanning Calorimetry

Karina V. Gataullina, Aleksey V. Buzyurov, Alexander V. Gerasimov, Askar K. Gatiatulin, Marat A. Ziganshin, Christoph Schick, Valery V. Gorbatchuk

Summary: Solid-state guest exchange is an efficient method for preparing highly metastable polymorphs of indomethacin. This method allows the preparation of metastable forms with low first melting points, and the characterization of indomethacin polymorphs was performed using fast scanning calorimetry.

CRYSTAL GROWTH & DESIGN (2023)

Article Physics, Multidisciplinary

Effects of Structural Relaxation of Glass-Forming Melts on the Overall Crystallization Kinetics in Cooling and Heating

Juern W. P. Schmelzer, Timur V. Tropin, Christoph Schick

Summary: In the theoretical treatment of crystallization, it is commonly assumed that liquid relaxation processes are faster than crystal nucleation and growth. However, near and below the glass transition temperature, this assumption is often not valid. Deviations from the metastable equilibrium state of the liquid must be considered when determining the kinetic coefficients, thermodynamic driving force, and surface tension of the crystal phase. These factors can greatly influence the overall crystallization process.

ENTROPY (2023)

Article Polymer Science

Determination of mass fractions in polypropylene/polyethylene blends using fast scanning calorimetry

Yoshitomo Furushima, Nobuhiro Hirota, Masaru Nakada, Akihiro Masuda, Kazuma Okada, Masatoshi Ohkura, Christoph Schick

Summary: Fast scanning calorimetry (FSC) allows rapid cooling of samples from the melt at rates of several thousand Kelvin per second. By fast cooling at rates of 5000 K s(-1), a perfect amorphous state for polypropylene (PP) can be achieved. In this study, a novel method combining FSC and differential scanning calorimetry was proposed to determine the PP/PE mixing ratio with a standard deviation of 1.4 mass%. The proposed method takes into account the thermal behavior of polyolefin blend components. It is expected to provide a convenient way to analyze the composition of recycled polyolefins without the need for high-temperature solvents or calibration curves.

JOURNAL OF APPLIED POLYMER SCIENCE (2023)

Article Polymer Science

Crystal Domains and Crystallization Kinetics of Poly(butylene terephthalate)

Akihiko Toda, Yoshitomo Furushima, Christoph Schick

Summary: The relationship between the changes in the crystallization kinetics and the crystal domains of poly(butylene terephthalate) was investigated under isothermal conditions. The Avrami exponent n characterizing the nucleation and growth kinetics of the crystal domains exhibited a continuous change within the target temperature range, indicating a change in the nucleation mode for spherical domains. The morphology of the crystal domains responsible for this change was identified, with a continuous change in the size of spherulites observed. The formation of 10 nm scale granular nodules with high nuclei density at low temperatures was also observed.

MACROMOLECULES (2023)

Article Polymer Science

Poly (butylene succinate): Low-temperature nucleation and crystallization, complex morphology and absence of lamellar thickening

Rene Androsch, Katalee Jariyavidyanont, Andreas Janke, Christoph Schick

Summary: In this study, the melt-crystallization process of PBS under different melt-supercooling conditions was analyzed using X-ray scattering techniques, microscopy, and fast scanning chip calorimetry. It was found that lamellar thickening is not the main mechanism of isothermal secondary crystallization, and low-temperature crystallization leads to the presence of crystal defects.

POLYMER (2023)

Article Chemistry, Physical

Determination of Cooperativity Length in a Glass-Forming Polymer

Yeong Zen Chua, Reiner Zorn, Juern W. P. Schmelzer, Christoph Schick, Olaf Holderer, Michaela Zamponi

Summary: To understand the properties of glass-forming liquids, the concept of cooperativity length is widely used. Experimental methods of determining this quantity are crucial for the understanding of both thermodynamic and kinetic properties. In this study, the cooperative length and cooperativity number were determined using AC calorimetry and QENS, and the results depended on whether temperature fluctuations were considered. The comparison between the two methods indicated that considering temperature fluctuations is important, and the cooperativity length can be derived from thermodynamic considerations.

ACS PHYSICAL CHEMISTRY AU (2023)

Article Chemistry, Physical

Some aspects of the glass transition of polyvinylpyrrolidone depending on the molecular mass

Semen Lapuk, Marina Ponomareva, Marat Ziganshin, Radik Larionov, Timur Mukhametzyanov, Christoph Schick, Ivan Lounev, Alexander Gerasimov

Summary: In this study, the glass transition of the biocompatible polymer polyvinylpyrrolidone was investigated using differential scanning calorimetry, fast scanning calorimetry, and broadband dielectric spectroscopy. The dependence of the difference in isobaric specific heat capacities between the liquid and glass on the dynamic glass transition temperature, volume, and number of particles in the cooperatively rearranging regions was determined. A linear relationship between the shift factor from the Frenkel-Kobeko-Reiner equation and the molecular mass of polyvinylpyrrolidone was established. These findings contribute to the selection of optimal excipients for the development of solid dispersions based on amorphous polymers.

PHYSICAL CHEMISTRY CHEMICAL PHYSICS (2023)

Article Thermodynamics

Nucleation and crystallization of deeply supercooled benzocaine, a rapidly crystallizing organic compound: A Fast scanning calorimetry investigation

Timur A. Mukhametzyanov, Ruslan A. Andrianov, Dmitrii N. Bolmatenkov, Mikhail I. Yagofarov, Boris N. Solomonov, Christoph Schick

Summary: The nucleation and crystallization of the rapidly crystallizing organic compound benzocaine show different behaviors under different supercooling conditions, and the temperature transition of nucleation and crystallization is sharp and sample-dependent.

THERMOCHIMICA ACTA (2023)

Article Polymer Science

Crystal Domains and Crystallization Kinetics of Poly(butylene terephthalate)

Akihiko Toda, Yoshitomo Furushima, Christoph Schick

Summary: The relationship between changes in crystallization kinetics and crystal domains of poly(butylene terephthalate) was investigated under isothermal conditions. The study found that the nucleation and growth kinetics of the crystal domains exhibited a continuous change within a certain temperature range. This change corresponded to the nucleation mode for spherical domains, such as spherulites and nodules, which depended on whether nucleation occurred from foreign heterogeneities or from the homogeneous melt. The morphology of the crystal domains, specifically the size and formation of spherulites and granular nodules, was identified as a factor contributing to the changes in crystallization kinetics.

MACROMOLECULES (2023)

Article Polymer Science

Addressable and stable physically unclonable functions based on cross-linked poly(2-vinylpyridine)

Mustafa Kalay, Abidin Esidir, Mahmut Ruzi, N. Burak Kiremitler, Mustafa Serdar Onses

Summary: This study proposes stable and addressable polymer PUFs, utilizing a cross-linkable polymer system, which demonstrates high stochastic characteristics and low-cost production. The performance of the polymer features is evaluated through various analyses, and direct image authentication is achieved using feature matching algorithms.

EUROPEAN POLYMER JOURNAL (2024)

Article Polymer Science

Low migration and high performance thioxanthone based photoinitiators

Jingyu Jin, Guoqiang Lu, Jun Nie, Xiaoqun Zhu

Summary: Photopolymerization technology is limited in the fields of food packaging and biomedicine due to the high migration of small molecules from photoinitiators. In this study, a polymerizable 2-vinyl thioxanthone (ETX) was synthesized to improve the migration stability of photoinitiators. Macromolecular photoinitiators (PPI1, PPI2) were also prepared to further reduce migration. The results showed that the ETX/TEOA system had higher initiation performance and PPI2 displayed favorable initiation ability. Additionally, the migration of ETX, PPI1, and PPI2 in photocured film was significantly reduced. These low-migration photoinitiators have potential applications in the fields of food packaging and biological materials.

EUROPEAN POLYMER JOURNAL (2024)

Article Polymer Science

Photoinitiators with low migration capability based on benzophenone

Weijie Li, Jun Nie, Yingying Zhao, Xiaoqun Zhu

Summary: This study focuses on the development of high-performance, low-migration photoinitiators. A polymerizable photoinitiator (VBP) was synthesized by introducing an ethylene group into benzophenone, and three different molecular weight single-component photoinitiators (PVBN1-3) were synthesized based on VBP. The results show that these new photoinitiators have stronger absorption ability compared to benzophenone and significantly reduce the migration of initiators and co-initiators, addressing the safety concerns caused by migration.

EUROPEAN POLYMER JOURNAL (2024)

Article Polymer Science

Covalent Introduction of Plasma-Treated carbon nanotubes into polyimide nanocomposites at Ultra-Low content

Seira Morimune-Moriya, Yuki Iwahashi, Mitsuru Nakamura, Daisuke Ogawa, Keiji Nakamura

Summary: This study investigates the effect of plasma treatment on carbon nanotubes (CNTs) and the structure/properties of polyimide (PI) nanocomposites with ultra-low content of CNTs. The results show that plasma treatment introduces isocyanate groups on the surface of CNTs and enhances the interfacial interaction between PI and treated CNTs. This leads to a significant improvement in the mechanical properties of the nanocomposites, with even a small addition of treated CNTs showing a substantial increase in Young's modulus, tensile strength and toughness.

EUROPEAN POLYMER JOURNAL (2024)

Article Polymer Science

Hydroxyethyl cellulose-based stretchable, antifreeze, ion-conductive hydrogel sensor

Yuanlong Li, Chaojie Chen, Guoqing Cui, Li Liu, Chao Zhou, Guangfeng Wu

Summary: In this study, a novel ion-conducting hydrogel was fabricated using a straightforward approach. The hydrogel showed excellent tensile properties and high toughness due to physical interactions and covalent binding. Additionally, the introduction of hydroxyethyl cellulose and lithium chloride improved the biocompatibility, mechanical properties, electrical conductivity, and frost resistance of the hydrogel, demonstrating its potential for cold climate applications.

EUROPEAN POLYMER JOURNAL (2024)

Article Polymer Science

How does the precursor backbone length affect the grafting efficiency and kinetics for bottlebrush polystyrenes prepared by graft-onto Strategy?

Dengwei Yan, Jinxian Yang, Xuejun Pan, Xiaozheng Duan, Lianwei Li, Mo Zhu

Summary: The influence of backbone length on grafting efficiency during the graft-onto reaction process was investigated. It was found that the polydispersity effect of backbone length does not affect the final grafting efficiency, indicating that the local dynamics of chain segments dominate the graft-onto process.

EUROPEAN POLYMER JOURNAL (2024)

Article Polymer Science

Catalyst-free epoxy vitrimers from rosin: Highly mechanical performance, fast self-healing, and facile recycling

Zhaoyi Luo, Xianjie Pan, Fanqi Liu, Quanxi Yi, Yanning Zeng, Yunhua Chen, Chaoyang Wang

Summary: This study provides a method to prepare high-performance epoxy materials with good malleability and thermal stability. The materials have self-healing and welding capabilities, thanks to the addition of specific chemical bonds and network structures. They exhibit mechanical properties comparable to commercial epoxy resins and show great potential for sustainable industrial development.

EUROPEAN POLYMER JOURNAL (2024)

Article Polymer Science

Novel triazine-based sulfur-containing polyamides: Preparation, adsorption efficiency and mechanism for mercury ions

Chaoji Xiong, Hao Wang, Lihua Deng, Kun Liang, Chunhua Wu, Wei Wu, Qian Chen

Summary: In this study, four polyamides were synthesized and their adsorption performances for Hg2+ in aqueous systems were investigated. The polyamides exhibited high adsorption capacities and excellent reusability, with the involvement of sulfur, nitrogen, and oxygen in the chemical adsorption process of Hg2+.

EUROPEAN POLYMER JOURNAL (2024)

Article Polymer Science

Combining isosorbide and lignin-related benzoic acids for high-Tg polymethacrylates

Siim Laanesoo, Olivier Bonjour, Rauno Sedrik, Iris Tamsalu, Patric Jannasch, Lauri Vares

Summary: The insertion of rigid aliphatic or aromatic building blocks in polymer structures is an effective way to synthesize high -Tg polymer materials. In this study, a series of isosorbide-2-aryl carboxylate-5-methacrylate monomers (ArIMAs) were synthesized by functionalizing isosorbide 5-methacrylate with various aromatic lignin-inspired esters. These monomers were polymerized to obtain high molecular-weight poly(aryl carboxylate isosorbide methacrylates) (PArIMAs). The resulting polymers showed high glass transition temperatures and thermal stability, making them suitable for use as high-performance plastics and coatings.

EUROPEAN POLYMER JOURNAL (2024)

Article Polymer Science

Influence of tannic acid post-treatment on the degradation and drug release behavior of Schiff base crosslinked konjac glucomannan/chitosan hydrogel

Yuqian Wu, Weijie Xu, Jianliang Li, Zhangfeng Zhong, Liqing Huang, Shengke Li, Huaping Tan

Summary: This study investigates the improvement of degradation and drug release characteristics of dynamic Schiff base-mediated natural polysaccharide hydrogels using tannic acid (TA), leading to enhanced stability and functionality.

EUROPEAN POLYMER JOURNAL (2024)

Article Polymer Science

Antimicrobial and anti-freezing conductive hydrogels driven by quaternary ammonium chitosan salt for flexible strain sensors

Xi Zhang, Xiangli Kong, Xin Zhou, Yiyan Gao, Yibo Sun, Guanghui Gao, Wei Liu, Kai Shi

Summary: Conductive hydrogels have great development prospects in flexible strain sensors, but long-term direct contact with human skin can cause bacterial infection. A hydrogel with antibacterial, biocompatibility, and toughness was designed and manufactured using a freeze-thaw method. The hydrogel maintains tensile properties and fatigue resistance at low temperatures and is resistant to bacteria. Therefore, hydrogel sensors can be used to monitor human movements.

EUROPEAN POLYMER JOURNAL (2024)

Article Polymer Science

Polyacrylamide quaternary ammonium salts based on stable adsorption in soil and its application on the control of soil-borne fungal disease

Wei Zhang, Jiangang Yu, Mingyang Wu, Rui Li, Anqiang Zhang, Yaling Lin

Summary: In this study, polyacrylamide containing quaternary ammonium salts (PAM-X) were synthesized and found to effectively inhibit soil-borne pathogenic fungi while maintaining the balance of microbial population in soil. PAM-X also showed low toxicity to earthworms and fish, providing a new method for the prevention and control of soil-borne fungal diseases.

EUROPEAN POLYMER JOURNAL (2024)

Article Polymer Science

Hygroscopic photothermal sorbents for atmospheric water harvesting: From preparation to applications

Jiawen He, Haojie Yu, Li Wang, Jian Yang, Yanhui Zhang, Wenbing Huang, Chenguang Ouyang

Summary: This review discusses the use of polymeric hydrogels for atmospheric water harvesting (AWH), including the mechanism of water sorption, fabrication methods, and strategies for optimizing the structure of hydrogels. The extended applications of hygroscopic photothermal hydrogels, such as agricultural irrigation and dehumidification, are also explored. The challenges and prospects of using polymeric hydrogels for AWH are summarized.

EUROPEAN POLYMER JOURNAL (2024)

Article Polymer Science

Plant-Inspired conductive hydrogels with long-lasting stability and low temperature tolerance for flexible sensors and signal transmission carriers

Ying Du, Shuaishuai Lu, Yuanna Sun, Qingshan Li, Xinhai He

Summary: This study introduces a method to improve the performance of hydrogels by incorporating proline, resulting in hydrogels with excellent stretchability, high conductivity, and long-term stability. The hydrogel remains flexible and conductive even at ultra-low temperatures.

EUROPEAN POLYMER JOURNAL (2024)