Article
Polymer Science
Tingwei He, Tao Liu, Junyao Huang, Xueli Wang, Yong He, Bomou Ma
Summary: A novel poly(ester amide)s (PEAs) was synthesized through melt polymerization, and the effects of polymerization temperature and time on its crystallization, thermal stability and amide transesterification were thoroughly investigated. The prepared PEAs were found to be semi-crystalline with melting point around 154-165 degrees C and decomposition temperature around 377-392 degrees C. The chemical structure of PEAs synthesized under different conditions was confirmed by H-1 NMR, C-13 NMR, and DEPT spectra, showing the occurrence of amide transesterification during the melt polymerization process.
JOURNAL OF POLYMER RESEARCH
(2021)
Article
Polymer Science
David M. Guptill, Bhavani Shankar Chinta, Trinadh Kaicharla, Shu Xu, Thomas R. Hoye
Summary: Poly(ester-amide)s (PEAs) were prepared by reacting MVL-derived diamidodiols with diacid chlorides in solution, resulting in materials with plastic properties. The stiffness of the materials can be tuned by choosing appropriate precursors. NMR studies were used to detect the degradation products of these materials.
Article
Polymer Science
Hiroaki Nobuoka, Rikyu Miyake, Jaeyeong Choi, Hiroaki Yoshida, Nalinthip Chanthaset, Hiroharu Ajiro
Summary: This research aims to create a library of ester-free trimetylene carbonate derivatives, with a focus on introducing cycloalkyl groups into the side chain to produce more versatile and high-performance polymers. The study found that different cycloalkyl groups can enhance the thermal properties of the polymer, with larger rings leading to an increase in glass transition temperature.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Chemistry, Applied
Annesha Kar, Muzamil Ahmad Rather, Manabendra Mandal, Niranjan Karak
Summary: Poly(ester amide urethane) resins were synthesized to overcome the shortcomings of poly(ester amide) and impart new features. The synthesized material showed excellent elongation, toughness, thermal stability, and chemical resistance. Aging tests proved their enhanced tensile strength parameters, making them suitable for outdoor applications. They also demonstrated good biodegradability and cytocompatibility.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Construction & Building Technology
Ahmed A. Nasr, Songgui Chen, Yang Wang, Feng Jin, Liu-Chao Qiu
Summary: A comprehensive research study was conducted to evaluate the compressive strength of a new underwater concrete type. The study found that the compressive strength of the concrete was compatible with the washout measurement outcomes, and the optimum slump flow should not exceed a certain value.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Materials Science, Biomaterials
Jianhua Zhang, Junfei Hu, Baoshu Chen, Tianbao Zhao, Zhipeng Gu
Summary: The PAA/PEA hybrid hydrogel dressing exhibits good antioxidant properties which can promote wound healing, support cell proliferation, and angiogenesis. Experimental results on mouse skin wounds demonstrate that the hybrid hydrogel scaffolds significantly accelerate the wound healing process, showing superior healing effects.
REGENERATIVE BIOMATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Hao Zhang, Fei Xie, Zhang Zhao, Noor Ul Afsar, Fangmeng Sheng, Liang Ge, Xingya Li, Xiwang Zhang, Tongwen Xu
Summary: Tuning the crosslinking density of interfacial-polymerized nanofiltration membranes can meet the demand of various applications. The properties of NF membranes can be tuned by choosing monomers with different structures and reactivities. PEA membranes with tunable crosslinked structures provide new possibilities for the development of task-specific separation membranes.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Green & Sustainable Science & Technology
Jinpeng Li, Hong Xu, Lichuan Chen, Boyi Li, Dan Liang, Shicong Ren, Shilei Zhang, Jun Wang
Summary: This study investigated the mechanical behavior of shallow unsaturated expansive soils under different saturation degrees through uniaxial tensile, unconfined compression, and direct shear tests. The results showed that the saturation degree has a significant influence on the soil's mechanical behavior, with the strength parameters initially increasing and then decreasing as the saturation degree increases.
Article
Construction & Building Technology
Shuzhen Zheng, Wenxiu Qiao, Jianfeng Ma, Yinwen Li, Shoufang Xu, Qianping Ran
Summary: Using organic/inorganic nanocomposites to optimize the microstructures of cement hydration products can improve the mechanical properties of cement-based materials. A novel nanohybrid material modified by a self-healing polymer was synthesized and used as a cement paste improvement agent. This material effectively improves the flexural strength of cement-based materials without negatively affecting their compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Alexander Funtan, Philipp Michael, Simon Rost, Juergen Omeis, Klaus Lienert, Wolfgang H. Binder
Summary: This study introduces an inline-monitoring system for assessing polymer degradation using optical detection systems. By embedding trifluoroacetyl functionalized stilbene molecules in crosslinked poly(ester imide)s (PEIs), chemosensors are able to track the release of alcoholic byproducts, allowing for direct spectroscopy monitoring of sensor activation. Fluorescence spectroscopy provides an easy detection tool for inline thermal monitoring of PEI degradation.
ADVANCED MATERIALS
(2021)
Article
Polymer Science
Ryoji Kudo, Tadashi Tsukamoto, Shiduko Nakajo, Atsuhiro Fujimori, Yoshiyuki Oishi, Yuji Shibasaki
Summary: High-molecular-weight hyperbranched polyether-b-amides (hb-PEBA) were prepared using NH2-terminated poly(ethylene oxide) (PEO) and COOH-terminated three-armed N-methylbenzamide pentamers (TMA-3MAB(5)) as macromonomers. The films showed improved mechanical properties and shape memory, confirming the effectiveness of the synthesis method.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Green & Sustainable Science & Technology
Jie Li, Hao Zhou, Wenwen Chen, Zhongfan Chen
Summary: A new type of interlocking hollow block using recycled aggregates concrete was proposed to improve construction efficiency, with mechanical properties studied and experimentally validated. Modifying coefficients and considering the positive contribution of connecting keys can accurately predict the compressive strength of masonry.
Article
Chemistry, Inorganic & Nuclear
Tengfei Jiang, Yihan Zhang, Jiaqi Zhang, Huaiguo Xue, Jingqi Tian
Summary: Oxygen vacancies in oxide semiconductors can alter their physical and chemical properties, making them suitable for photocatalytic applications such as water splitting, carbon dioxide reduction, and organic synthesis. However, the role of oxygen vacancies in photocatalytic organic synthesis remains unclear. In this study, oxygen vacancies were constructed on CuFe2O4 nanoparticles, resulting in the highly efficient and selective photocatalytic synthesis of an unsaturated amide. The enriched surface oxygen vacancies were found to enhance charge separation efficiency and optimize the reaction pathway, as confirmed by experimental and theoretical analyses.
INORGANIC CHEMISTRY
(2023)
Article
Polymer Science
Thi Phuong Thu Nguyen, Nadine Barroca-Aubry, Ludovic Costa, Yann Bourdreux, Gilles Doisneau, Philippe Roger
Summary: This study reports for the first time the controlled synthesis of PPFPMA through Cu(0)-mediated RDRP method, investigating influencing factors and finding the optimal conditions to successfully synthesize low dispersity PPFPMA with controlled polymerization features.
Article
Chemistry, Applied
Laura Boetje, Xiaohong Lan, Fitrilia Silvianti, Jur van Dijken, Michael Polhuis, Katja Loos
Summary: This study presents a series of starch esters synthesized through transesterification reactions catalyzed by TBD in DMSO. By purging the reaction flask with nitrogen, the degree of substitution was increased. Long-chain fatty acids exhibited the most significant increase in DS, while starch esters from unsaturated fatty acids showed lower Tg and higher hydrophobicity compared to pristine starch.
CARBOHYDRATE POLYMERS
(2022)
