Article
Polymer Science
Saeed Dolatshah, Shervin Ahmadi, Amir Ershad-Langroudi, Hedieh Jashni
Summary: This study investigated the synergistic effect of different chain extenders and catalysts on the rheological behavior of PET, finding that a combination of PMDA and PENTA at 1.5% and 0.5% respectively resulted in the best rheological properties for modified PET. Additionally, DBTDL acted as an accelerator for chain extension reaction, improving the rheological properties of PET by increasing the chain extending rate. Thermal properties of modified PET were also studied using differential scanning calorimetry.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Chemistry, Medicinal
Ekaterina Bogdanova, Anna Millqvist Fureby, Vitaly Kocherbitov
Summary: The paper presents a DSC study on ice crystallization and melting in a sucrose-water system. It investigates the influence of cooling and heating rates on the thermal behavior of sucrose-water solutions and explores the reasons for the existence of two steps on DSC heating curves. The results show that diffusion of water can be a limiting factor for ice growth and melting in the sucrose-water system.
JOURNAL OF PHARMACEUTICAL SCIENCES
(2022)
Article
Thermodynamics
S. P. Magalhaes da Silva, Monica A. Silva, Jose M. Oliveira
Summary: This study investigated the non-isothermal cold crystallization behaviors of cork-polymer composites based on polylactic acid matrix. The results showed that cork powder residues act as a nucleating agent, accelerating the crystallization rate and reducing the half-time crystallization values. Additionally, the addition of cork was found to decrease the cold crystallization temperature of the PLA matrix.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Polymer Science
Shouang Wu, Bocheng Wang, Xiaoling Xu, Chonggang Wu, Tao Hu, Xuan Zheng, Xinghou Gong
Summary: The addition of S-MA compatibilizer had a positive impact on the dispersion and crystallization behavior of SBS in PLA blends. The study found that SBS exhibited both plasticization and dilution effects under different conditions, with the effects being enhanced with increasing S-MA content.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Alireza Bahramian
Summary: In this study, the environmental sustainability, mechanical durability, and thermal stability of PET-based nanocomposite films were evaluated compared to pure PET. The addition of different nanoparticles had significant effects on the properties of the samples, with the interaction of SiO2NPs with PET chains showing the most promising improvement in sample performance.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Engineering, Mechanical
Andreas Conrad, Annika Hodapp, Bernhard Hochstein, Norbert Willenbacher, Karl-Heinz Jacob
Summary: This study investigates the crystallization, melting and glass transition of Li- and Ca-12-hydroxystearate greases in relation to the pour point of the corresponding oils. The addition of thickeners increases the crystallization temperature and decreases the melting temperature of mineral oil-based greases. Thickeners also induce a small increase in the glass transition temperature of synthetic oils. The presence of thickeners changes the crystallization behavior from homogeneous to heterogeneous and acts as a crystallization nucleus. The pour point of the base oil does not accurately define the lowest application temperature for greases.
Article
Materials Science, Ceramics
Raphael Midea Cuccovia Vasconcelos Reis, Luciana Ghussn
Summary: A new generalized method for determining surface crystallization growth rates using a single DSC experiment has been proposed. The method is versatile, accurate, and convenient, with successful testing on different sample geometries.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Thermodynamics
Daniele Sonaglioni, Elpidio Tombari, Simone Capaccioli
Summary: Fast scanning calorimetry is a useful experimental technique that can suppress reorganization processes. This paper proposes a new method for estimating the dynamical thermal lag and provides a novel interpretation of heat flow losses due to the sample. The use of glass to liquid transition is also shown as a new method to reveal static thermal gradients.
THERMOCHIMICA ACTA
(2023)
Article
Thermodynamics
Valerio Di Lisio, Balthasar Braunewell, Cristina Macia-Castello, Margherita Simoni, Roberto Senesi, Felix Fernandez-Alonso, Daniele Cangialosi
Summary: This work presents a new sample-preparation methodology using fast scanning calorimetry (FSC) to investigate volatile materials. The protocol involves embedding the specimen in an inert silicone-oil-based matrix and gold sputtering for full encapsulation and isolation. The methodology is tested on carbon-based materials - resorcinol, corannulene, and perylene, revealing new thermodynamic stability and meta-stability regimes, such as glassy states, cold crystallization, and solid-to-solid transformations.
THERMOCHIMICA ACTA
(2023)
Article
Polymer Science
Mohamed H. Darweesh, Safaa H. El-Taweel, Bernhard Stoll
Summary: The thermal and mechanical properties of binary blends of polypropylene (PP) with a statistical copolymer (VM) were investigated. The two components were found to be miscible in the melt. DSC testing showed that the crystallization temperature of PP decreased with increasing VM content. The measurement of viscoelastic properties revealed a three-phase model, with VM mainly located in the mobile amorphous phase and PP in the rigid amorphous phase.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Engineering, Environmental
Hajo Bitter, Susanne Lackner
Summary: Differential scanning calorimetry (DSC) can be used to quantify microplastics, with improved detection accuracy and limits achieved through defined pre-heating and cooling steps. The method is shown to be feasible for environmental samples, with quantification limits and accuracy demonstrated for various polymers such as PE, PET, PP, and PA6.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Medicinal
Tamaki Miyazaki, Ryo Mizoguchi, Keisuke Ueda, Taeko Shinozaki, Mie Kamoto, Yoshihiro Takeda, Satoshi Sakuma, Naoya Ito, Michiko Momo, Kohsaku Kawakami
Summary: High inter-laboratory reproducibility is crucial for collaborative experiments among multiple laboratories. In this study, we aimed to establish a protocol for isothermal storage tests to ensure consistent data quality from all participating laboratories. Sharing a detailed protocol similar to the experimental section of general papers was not sufficient for achieving high inter-laboratory reproducibility. By investigating the causes of data variations among laboratories, we gradually refined the protocol to improve reproducibility. Specific instructions on sample temperature control during transfer contributed to reducing variability. Our findings also revealed differences in the physical stabilities of amorphous drugs when prepared in differently shaped aluminum pans designed for various differential scanning calorimeters.
JOURNAL OF PHARMACEUTICAL SCIENCES
(2023)
Article
Biochemistry & Molecular Biology
Jolanta Tomaszewska-Gras, Mahbuba Islam, Liliana Grzeca, Anna Kaczmarek, Emilia Fornal
Summary: This study aimed to describe the thermal properties of selected cultivars of flaxseed oil using the DSC technique. Findings revealed characteristics of crystallization and melting profiles, as well as the influence of temperature and heating rate on the stability of flaxseed oil during thermal oxidation. Negative correlations were observed between unsaturated fatty acid content and thermal properties.
Article
Construction & Building Technology
Panos Apostolidis, Michael Elwardany, Adrian Andriescu, David J. Mensching, Jack Youtcheff
Summary: The contribution of thermodynamics of mixing to glass transition in polymer-modified asphalt binders was studied quantitatively using a differential scanning calorimeter with an epoxy system. The miscibility of the binders was determined by measuring the heat capacity (Cp) and glass transition temperature (Tg) based on entropic changes. The enthalpy of mixing was also examined to ensure complete crosslinking of the binders. The results showed that the positive deviations of Tg from the ideal mixing rule indicated the presence of repulsive forces between the asphalt and epoxy components.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Youngkwan Yoon, Jin Young Koo, Hee Cheul Choi
Summary: The synthesis of helical crystals from achiral molecules is crucial due to their unique applications in various fields depending on chirality. Surprisingly, many examples of helical crystals of achiral molecules have been obtained without specific synthetic strategies. This study proposes the application of Eshelby twist to noncovalent molecular crystals by introducing screw dislocations, and successfully synthesizes helical tube crystals of achiral titanyl phthalocyanine through vapor-phase crystal growth. The presence of screw dislocation induces crystal twisting along the growth direction to release strain.
Review
Materials Science, Composites
Khadidja Arabeche, Fatiha Abdelmalek, Laurent Delbreilh, Latefa Zair, Abdelkader Berrayah
Summary: Biodegradable poly(butylene succinate) (PBS)/Alfa fiber biocomposites were prepared via compression molding and characterized by scanning electron microscopy, rheological analysis, and thermal behavior investigation. The presence of Alfa fibers as nucleating agents facilitated the crystallization of PBS matrix, resulting in improved dynamic behavior and complex viscosity of the biocomposites. The change in Cole-Cole curve indicated a modification in the microstructure of PBS with the addition of fibers, which can be attributed to the homogeneous dispersion of fibers and strong interfacial interactions between the constituents.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2022)
Article
Pharmacology & Pharmacy
Stephane Roulon, Ian Soulairol, Valerie Lavastre, Nicolas Payre, Maxime Cazes, Laurent Delbreilh, Jean Alie
Summary: This research aimed to identify important parameters for 3D printing of oral formulations and evaluate the physical form of drugs and mechanical properties of filaments through investigating different formulation storage conditions.
Article
Engineering, Multidisciplinary
B. Vieille, E. Ernault, N. Delpouve, J-D. Pujols Gonzalez, A. Esposito, E. Dargent, L. Le Pluart, L. Delbreilh
Summary: This study investigates the influence of structural changes induced by annealing on the mechanical properties of PPS and the fracture mechanics of Carbon/PPS laminated composites. The research found that optimum annealing conditions contribute to increased axial stiffness and trans-laminar toughness, leading to slower crack propagation during failure.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Polymer Science
Nicolas Delpouve, Hajar Faraj, Clement Demarest, Eric Dontzoff, Marie-Rose Garda, Laurent Delbreilh, Benjamin Berton, Eric Dargent
Summary: The immersion in water was found to have an impact on the morphology and thermomechanical properties of a biocomposite made of PLA modified with an ethylene acrylate toughening agent and reinforced with miscanthus fibers, weakening the mechanical properties. The cracking of the fiber/matrix interface was identified as the main driver of water-induced degradation. Additionally, the study examined the influence of PLA stereoregularity, crystallinity, and annealing on the biocomposite properties.
Correction
Polymer Science
Khadidja Arabeche, Laurent Delbreilh, Eric Baer
JOURNAL OF POLYMER RESEARCH
(2022)
Article
Engineering, Industrial
M. P. Sealy, K. L. M. Avegnona, A. P. Garrettb, L. Delbreilhc, S. Bapata, A. P. Malshe
Summary: Emerging cell-cultured meat utilizes advances in stem cell biology and tissue engineering to manufacture animal-derived food. This research demonstrates that bioprinted soy-based polymers as edible scaffold material exhibit stable thermomechanical and chemical properties when subjected to high-temperature exposure during cooking. This study provides a foundation for high-temperature edible mechanics in the photolithographic manufacturing of cell-cultured meat and establishes new opportunities for tuning food properties.
CIRP ANNALS-MANUFACTURING TECHNOLOGY
(2022)
Article
Polymer Science
Steven Araujo, Chloe Sainlaud, Nicolas Delpouve, Emmanuel Richaud, Laurent Delbreilh, Eric Dargent
Summary: This study investigates the degradation of polylactide (PLA) under UV exposure. The results show that UV exposure leads to a reduction in PLA chain length, a decrease in glass transition temperature, and a decrease in the activation energy needed for thermal degradation. Furthermore, UV-induced degradation also affects the cooperative rearranging region (CRR) size and the kinetic fragility of PLA.
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2022)
Article
Polymer Science
Bidur Rijal, Laurent Delbreilh, Cyrille Sollogoub, Eric Baer, Allisson Saiter-Fourcin
Summary: This work investigates the influence of layer thicknesses on glass transition and molecular mobility in PC and PETg multilayered films, revealing the differences in their structural and dynamical properties. The study also highlights the different behaviors of PETg and PC, suggesting the formation of immiscible structures.
Proceedings Paper
Polymer Science
Blandine Quelennec, Nicolas Delpouve, Laurent Delbreilh, Romain Delannoy, Emmanuel Richaud
Summary: This study investigates the structural relaxation of an epoxy resin based on bisphenol A diglycidyl ether polymer and a hardener using fast scanning calorimetry. The relaxation behavior at various distances from the glass transition temperature is explored through annealing experiments, and the relaxation data is analyzed using the TNM model.
MACROMOLECULAR SYMPOSIA
(2022)
Proceedings Paper
Polymer Science
Romain Delannoy, Emmanuel Richaud, Vincent Tognetti, Blandine Quelennec, Laurent Delbreilh, Nicolas Delpouve
Summary: This study investigates the changes in macromolecular mobility during the thermal oxidation of epoxy-amine thermoset networks. Three epoxy-amine systems cured with DGEBA and three similar aliphatic hardeners (EDA, DETA, and TETA) were aged at 160 degrees C and characterized by dynamic mechanical analysis (DMA). The results show a split of the single initial alpha relaxation peak with aging, indicating preferred chain scissions at certain oxidizable sites in the network. A beta relaxation at around -60 degrees C remains relatively unchanged with aging, while another sub-glass transition around 30 degrees C decreases. The implications of this work on mechanical fracture properties and segmental mobility of radical chemical functions involved in bimolecular oxidation reactions need further confirmation.
MACROMOLECULAR SYMPOSIA
(2022)
Article
Materials Science, Ceramics
Clement Fosse, Antonella Esposito, Shanmugam Thiyagarajan, Michelina Soccio, Nadia Lotti, Eric Dargent, Laurent Delbreilh
Summary: This work investigates the impact of molecular groups in polyester backbones on molecular dynamics, comparing furan-based polyesters with terephthalic counterparts. The study reveals that increasing the length of the glycolic subunit reduces the cooperativity in both types of polyesters. However, there is no direct correlation between the fragility index and cooperativity in furan-based polyesters with different glycolic subunit lengths.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Engineering, Environmental
Clement Fosse, Antonella Esposito, Pierre Lemechko, Yoga Sugama Salim, Valerio Causin, Valerie Gaucher, Stephane Bruzaud, Kumar Sudesh, Laurent Delbreilh, Eric Dargent
Summary: Two series of poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBHV) and poly (3-hydroxybutyrate-co-3-hydroxyhex-anoate) (PHBHHx) with different comonomer units were compared. The chemical composition affects the molecular mobility, crystallization aptitude, and microstructures in quenched and cold-crystallized samples. The presence of propyl side-groups has a larger influence on T-g shift compared to ethyl side-groups. Cold-crystallization broadens the glass transition, while heating amorphous copolymers disrupts crystallization. The comonomer units play a role in crystallization kinetics and result in different microstructures.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Mechanics
Mehrdad Negahban, Wenlong Li, Jean-Marc Saiter, Laurent Delbreilh, Kyle Strabala, Zheng Li
Summary: We propose a model to characterize the dilatational response of glassy polymers, incorporating thermal expansion, elastic back-stress, and viscosity. We evaluate the model using experiments on polycarbonate, considering elastic, thermal, and viscous properties. The model is examined under different thermal and mechanical loadings, crossing the glass transition.
JOURNAL OF RHEOLOGY
(2023)
Article
Polymer Science
Aurelie Bourdet, Clement Fosse, Marie-Rose Garda, Shanmugam Thiyagarajan, Laurent Delbreilh, Antonella Esposito, Eric Dargent
Summary: Different position isomers of furandicarboxylic acid (FDCA) can be obtained from biomass and used for the synthesis of polyethylene furanoate (PEF). The crystallization behavior of PEF can be tunable by partially replacing 2,5-FDCA with its position isomer. The use of Fast Scanning Calorimetry (FSC) is recommended for accurate characterization of PEF's microstructure and thermal stability.
Article
Chemistry, Physical
C. Le Bras, C. Fosse, L. Delbreilh, M. Gervais, M. Ayad, A. Soumaila Sounakoye, L. Berthe, S. Valadon, B. Fayolle
Summary: This study investigates the mechanical behavior of polycarbonate and polydimethylsiloxane (Sylgard184) under laser shock conditions. The results show that Sylgard184 exhibits glassy behavior under laser shock conditions, while polycarbonate does not show significant changes in behavior. Dielectric relaxation spectroscopy (DRS) measurements further characterize the flow behavior of the polymer chains under extreme conditions.
