Article
Materials Science, Composites
Wan Faiza, Amin Firouzi, Muhammad Remanul Islam, Gulam Sumdani, Abu Taher
Summary: In this study, degradation of epoxy-based composites reinforced with fish scale particles was investigated using two enzymes, and significant deterioration of the properties of the composites was observed. The presence of enzymes led to reductions in flexural strength, crystalline temperature, and weight of the composites. Fish scale proved to be a potential filler for tuning mechanical properties of polymers and facilitating polymer degradation.
POLYMER COMPOSITES
(2021)
Article
Polymer Science
Guilhem Coste, Claire Negrell, Sylvain Caillol
Summary: Polyurethane (PU) foams, with their unique physical properties and easy blowing characteristics, are widely used materials. In recent years, greener alternatives to isocyanates have been explored. One promising approach is the production of polyhydroxyurethanes (PHU), although this typically requires the use of external blowing agents. This study focuses on the synthesis of PHU foams using in situ reactions to produce NIPU foams with a chemical blowing agent.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Maria Chiara Mistretta, Luigi Botta, Francesco Paolo La Mantia, Antonino Di Fiore, Marco Cascone
Summary: Biodegradable polymer-based nanocomposite films show potential advantages in agricultural applications, with added nanofillers increasing rigidity and tear strength of the films without compromising ductility.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2021)
Article
Polymer Science
Christian Hopmann, Sebastian Kammer, Martin Facklam
Summary: The use of water-loaded silica as blowing agent can result in premature foaming, large cell formation, reduced rubber matrix resistance, and affected cross-linking reactions. In addition, water can reduce the cross-linking density of EPDM and NBR, shorten the incubation time of the CBS retarder in the cross-linking system of NBR, but is not sufficient to fix the foamed cells.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Physics, Fluids & Plasmas
Tousif Ahmed, Bing Han, Michael Sulecki, Marigrace Ferrill, Zubaer M. Hossain
Summary: This paper explores the scaling laws governing the time-evolution behavior of solvent-mediated strength at the interface between two identical thermoplastic polymers below the glass-transition temperature. The evolution of strength, stiffness, and toughness is controlled by pure diffusion and can be treated as a Gaussian process. The kinetics of the evolution processes is well captured by the dissolution of polymer particles, with dissolution rate being shape dependent and governed by the surface-to-volume ratio.
Article
Materials Science, Characterization & Testing
Bilen Emek Abali, Mert Yucel Yardimci, Michele Zecchini, Gilda Daisse, Flavio H. Marchesini, Geert De Schutter, Roman Wan-Wendner
Summary: During curing of thermosetting polymers, crosslinking leads to hardening or stiffening of the material. Daily temperature variations can alter the curing process and potentially result in lower stiffness. Rheometer measurements have been used to model the mechanical response dependency on the degree of cure.
Article
Polymer Science
Paolo Trucillo, Fabrizio Errichiello, Ernesto Di Maio
Summary: This paper investigates the effect of CO2, N-2, and He as blowing agents on PPSU foam. The experimental results show that CO2 has the highest diffusivity, followed by N-2, and He has the lowest. Scanning electron microscopy analysis reveals the highest cell number density for CO2.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Jing Tian, Xiaoliang Cheng, Baohua Guo, Jun Xu
Summary: This study established a laboratory test method for evaluating the film-blowing processability of biodegradable materials and proposed key indicators. The generalizability of these indicators was verified, and the optimal formulation for PHBHHx was successfully validated. Finally, a quantitative relation between material formulation, key indicators, and film-blowing processability was developed to guide blown film processing and formulation design.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Natanel Jarach, Hanna Dodiuk, Samuel Kenig, Shlomo Magdassi
Summary: This study introduces fully recyclable Reversible Covalent Bond-Containing Polymers (RCBPs) as a sustainable alternative to traditional polymers and plastics. It achieves low-temperature multiple printing and complete reversibility using polymers with reversible photopolymerization reactions and a microwave.
ADVANCED MATERIALS
(2023)
Article
Construction & Building Technology
D. Snoeck, W. Goethals, J. Hovind, P. Trtik, T. Van Mullem, P. Van den Heede, N. De Belie
Summary: This study used neutron tomography to study and visualize water release kinetics over time, focusing on two different types of SAPs and their impact on autogenous shrinkage. Per-voxel analysis using piecewise-constant functions provided insights into the time window of internal curing.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Michael J. Minkler, Xinyu Hou, Nima Alizadeh, Maria L. Auad, Anton K. Schindler, Lauren E. Beckingham, Bryan S. Beckingham
Summary: The curing behavior and physical properties of an epoxy-based system for an injectable wellbore sealant were investigated. The material behavior is dependent on curing temperature and comonomer content, with increasing temperature or DGEBA content affecting the curing rate, pre-curing solution viscosity, and post-curing glass transition temperature.
Article
Chemistry, Applied
Xuwei Huang, Jingrui Wang, Jian Wang, Qingmin Li
Summary: The research found that the core group and molecular length of curing agents impact the reactivity of epoxy resins, with the SDA-cured epoxy model showing the best elastic behavior under mechanical stress. The glass transition temperatures of all crosslinked epoxies are close and exhibit low permeability, with the SDA-crosslinked epoxy model showing the most significant effects.
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Biochemistry & Molecular Biology
Zhaorui Xu, Guilong Wang, Zhaozhi Wang, Aimin Zhang, Guoqun Zhao
Summary: This study developed two microcellular foaming routes with different charging orders of mixed blowing agents to investigate their effects on the foaming behavior of plant-derived thermoplastic polyester elastomer (TPEE). The results showed that TPEE foams prepared by the N2 firstly charging process (N2-F-process) exhibited less shrinkage and higher creep recovery ratio compared to those prepared by the CO2 firstly charging process (CO2-F-process). The N2-F-process also led to enhanced strength and resilience of the TPEE foams, making it a promising technique for developing high-performance polymeric foams.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Construction & Building Technology
Norhaliza Hamzah, Hamidah Mohd Saman, Mohammad Hajmohammadian Baghban, Abdul Rahman Mohd Sam, Iman Faridmehr, Muhd Norhasri Muhd Sidek, Omrane Benjeddou, Ghasan Fahim Huseien
Summary: Self-cured concrete, by adding a water-filled internal curing agent, can slowly release water to mitigate water loss and enhance water retention compared to conventional concrete. Various materials have been studied as curing agents, improving the physical, mechanical, and microstructure properties of self-curing cement-based materials, as well as reducing cracking and shrinkage.
Article
Chemistry, Applied
Kun Huang, Xuetong Fan, Richard Ashby, Helen Ngo
Summary: The study investigated the structure-activity relationship of antibacterial bio-based epoxy polymers made from phenolic branched fatty acids by preparing curing agents from phenolic BCFAs and polyamines. The bio-epoxy polymers, especially phenol-BCFA (EDA) and creosote BCFA (EDA), demonstrated significant antimicrobial activity against a broad range of bacteria, indicating their potential as inherently antibacterial materials. The study also highlighted the importance of amphiphilicity in contributing to the antimicrobial activity of the bio-epoxy polymers.
PROGRESS IN ORGANIC COATINGS
(2021)
