Article
Polymer Science
Mingkun Chen, Zhiguo Jiang, Zhaobin Qiu
Summary: The research conducted a two stage method of transesterification/esterification and polycondensation to synthesize three biobased poly(hexamethylene 2,5-furandicarboxylate-co-adipate) copolyesters with low hexamethylene adipate (HA) units. The copolyesters exhibited good thermal stability, with thermal properties decreasing as the content of HA units increased. Increased HA units resulted in higher elongation at break and a relatively high melting point temperature for the copolyesters.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Polymer Science
Pavel A. Mikhailov, Kirill V. Zuev, Valery G. Kulichikhin
Summary: A series of new wholly aromatic (co)polyesters based on m-substituted bifunctional comonomers-4'-hydroxybiphenyl-3-carboxylic (3HBCA) and 3-hydroxybenzoic (3HBA) acids were synthesized with high compositional homogeneity. Thermal analysis showed that the copolyesters have high thermal stability and an increase in the content of biphenyl units leads to a significant increase in the glass transition temperature. Rheological measurements indicated anisotropic properties in melts of copolyesters with a high content of 3HBCA units. However, polarization optical microscopy did not confirm the transition to the liquid crystal state for these polyesters.
Article
Chemistry, Multidisciplinary
Fiaz Hussain, Jaemin Jeong, Sangwon Park, Soo-Jung Kang, Waheed Qamar Khan, Jinhwan Kim
Summary: In this study, two series of biobased novel copolyesters were synthesized and characterized, with results showing that isosorbide significantly improves the glass transition temperature of the copolyesters. The synthesized copolyesters exhibit high T-g and wide processing window, making them suitable for versatile industrial applications, especially in biomedical, packaging, and optical fields.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Polymer Science
Peng Wei, Longlong Li, Li Wang, Jinfei Yan, Nan Zeng, Longxin Li, Nan Sun, Lu Bai, Helong Li, Yifeng Zhang
Summary: In this study, a series of high performance biobased liquid crystal copolyesters were designed and prepared using a melt polymerization method. These copolyesters exhibited low melting temperatures, controllable crystallinity, broad temperature range of liquid crystal phase, good thermal stability, and excellent melt processing ability. Compared to PEEK materials, the copolyesters showed better mechanical properties, hydrophilicity, and biocompatibility, making them prospective for load-bearing bone repair applications.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Maria Nunez, Sebastian Munoz-Guerra, Antxon Martinez de Ilarduya
Summary: This study investigates the enzymatic synthesis of poly(butylene-co-epsilon-caprolactone) copolyesters for the first time, demonstrating high thermal stability and semicrystalline properties. The use of Candida antarctica lipase B resulted in copolyesters free from toxic metallic catalysts, making them potential candidates for biomedical applications.
Article
Chemistry, Analytical
Peng Wei, Jinfei Yan, Longlong Li, Hejuan Lou, Yifeng Zhang, Keqian Hao, Yumin Xia, Yanping Wang, Yimin Wang
Summary: In this study, the thermal degradation and pyrolysis behavior of three wholly aromatic phosphorus-containing thermotropic liquid crystal copolyesters were investigated. The copolyesters exhibited better thermal stability and flame retardancy with higher content of DOPO-HQ. The findings of this research provide guidance for the processing and application of these copolyesters.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Polymer Science
Pavel A. Mikhaylov, Kirill V. Zuev, Marina P. Filatova, Boris Kh. Strelets, Valery G. Kulichikhin
Summary: A series of novel copolyesters based on PET and HBCA were synthesized through melt polycondensation, showing increased heat resistance and ordered structure for improved performance.
Article
Polymer Science
Ting Shen, Kaicheng Deng, Yuewei Chen, Yong He, Yang Zhu, Junting Xu, Jun Ling
Summary: Controlling the monomer sequence allows for predictable structure-property relationships in versatile polymeric materials. In this study, a series of thermoplastic elastomers with tailored thermal, mechanical, rheological, and degradable properties were synthesized through a facile synthesis method. The properties, including melting temperature, tensile strength, ductility, viscosity, and enzymatic degradability, were found to be governed by the block length of the multiblock copolymers.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Polymer Science
Maryam Safari, Itziar Otaegi, Nora Aramburu, Gonzalo Guerrica-Echevarria, Antxon Martinez de Ilarduya, Haritz Sardon, Alejandro J. Mueller
Summary: Isodimorphic behavior is determined by partial inclusion of comonomer segments within the crystalline structure, with isodimorphic random copolymers able to crystallize regardless of composition and exhibiting coexistence of two crystalline phases in the pseudo-eutectic region. The crystallization conditions determine the crystalline phase of the copolymer in the pseudo-eutectic region where both crystalline phases can coexist.
Article
Engineering, Environmental
Shuanpu Cai, Zhengzai Cheng, Lesly Dasilva Wandji Djouonkep, Linfeng Wang, Huan Wang, Mario Gauthier
Summary: A series of novel bio-sourced aliphatic-aromatic copolyesters were successfully synthesized and characterized in this study. The copolyesters exhibited good degradation performance, mechanical properties, and low ecotoxicity.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Chemistry, Multidisciplinary
Peng Wei, Hejuan Lou, Wei Wang, Shaonan Geng, Yanping Wang, Yumin Xia, Yimin Wang, Mingli Jiao
Summary: Wholly aromatic phosphorus-containing thermotropic liquid crystal polymers were successfully synthesised via one pot melt polymerisation method in this study. The copolyesters showed high thermal stability, good liquid crystal behaviour, and excellent processing ability, making them promising for potential use in the safety protection field.
Article
Polymer Science
Mohamed Yousfi, Cedric Samuel, Tarek Dadouche, Rosica Mincheva, Marie-France Lacrampe
Summary: Highly biobased poly(butylene succinate-co-terephthalate) (PBST) with processing temperatures close to those of commodity polymers (160-180 degrees C) and long-chain branched architectures (LCB) are synthesized. Two different strategies, a two-step synthesis route and a one-step synthesis strategy, are proposed. The rheological properties, including melt strength properties, are investigated. The effectiveness of these strategies in improving the melt strength and eliminating extrusion defects/instabilities in PBSTs is demonstrated, allowing the potential expansion of industrial applications in packaging and sustainable applications.
EXPRESS POLYMER LETTERS
(2023)
Article
Polymer Science
Zhoufeng Wang, Junwei Hu, Bolin Wang, Yingying Liu, Xiubo Long
Summary: A series of novel aromatic copolyesters were synthesized by interfacial polymerization, with molecular weights ranging from 1.06-1.80 x 10(4) g/mol to 2.01-6.17 x 10(4) g/mol. Density functional theory calculations revealed similar reactivity between BPB and BPA, with reaction activation energies of 8.23 kcal/mol and 59.30 kcal/mol for BPB with TPC and IPC, and PR with IPC and TPC, respectively. The copolymers exhibited improved solubility and glass transition temperature (T-g) due to the ethyl side group of BPB and the pendant group of PR, with T-g ranging from 125.1-195.3 degrees C and T-max remaining above 525.72 degrees C. The copolyesters showed high optical transmittance at 450 nm (T-450) of 69.29%-99.41%, and had tensile strength and Young's modulus in the range of 46.79-58.59 MPa and 1.39-1.86 GPa, respectively. These aromatic copolyesters demonstrated excellent mechanical and processability properties, with significant potential as high-performance plastics.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Huan Wang, Zhengzai Cheng, Lesly Dasilva Wandji Djouonkep, Chupeng Lan, Linfeng Wang, Shuanpu Cai, Ling Ding, Mario Gauthier
Summary: A series of aliphatic-aromatic polyesters were successfully synthesized in this study, which possess the advantages of being renewable, degradable, and abundant. The properties of the copolyesters can be adjusted by varying the length of the carbon chains of the dicarboxylic acid moieties. Thermal analysis showed that these copolyesters exhibit good thermal stability, mechanical properties, and biodegradability. The investigation of eco-toxicity demonstrated their low toxicity in natural habitats, contributing to carbon neutrality and sustainable development of bio-based plastics.
Article
Chemistry, Inorganic & Nuclear
Manzar Zahra, Habib Ullah, Mohsin Javed, Shahid Iqbal, Jigar Ali, Hamad Alrbyawi, Samia, Norah Alwadai, Beriham Ibrahim Basha, Amir Waseem, Sadaf Sarfraz, Adnan Amjad, Nasser S. Awwad, Hala A. Ibrahium, H. H. Somaily
Summary: The synthesis of polyurethane/zinc oxide (PU/ZnO) nanocomposites was successfully achieved in this study. SEM, FTIR spectroscopy, and XRD were used to confirm the structure and particle size of ZnO. The results showed that the nanoparticles were uniformly dispersed on the polymer surface, leading to improved material properties and thermal stability.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)