Article
Polymer Science
Sudan Zhou, Maolin Guo, Yujuan Jin, Jianjian Sun, Huafeng Tian, Jing Hu
Summary: This study modified poly(lactic acid) (PLA) by melt blending it with epoxy-terminated hyperbranched polymer (EHBP) to improve its toughness and strength. The results showed that the epoxy groups within EHBP reacted with carboxyl and hydroxyl groups of PLA, creating chemical micro-crosslinking, and intermolecular hydrogen bonds were also formed between EHBP and PLA. The combination of these factors led to improved mechanical properties of PLA. The best modification effect was achieved when 2.5 phr of EHBP was added.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Matthew W. Halloran, Jim A. Nicell, Richard L. Leask, Milan Maric
Summary: This study focused on designing rubber toughening agents using trans-beta-farnesene as a building block to enhance the impact strength of PLA blends. Ternary blends showed significant improvements in impact strength and elongation at break, and their phase morphologies were evaluated using SEM.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Engineering, Environmental
Xiaolong Han, Yujuan Jin, Bohua Wang, Huafeng Tian, Yunxuan Weng
Summary: The addition of EHBP improved the compatibility of PPC and PBS, while enhancing the mechanical properties of the blends, demonstrating a significant toughening effect.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2022)
Article
Polymer Science
Jie Zhang, Hui-Ting Tian, Yu-Ting Zhang, Chun-Pu Hu, Zhi-Ping Zhang
Summary: An isocyanate-terminated hyperbranched polymer (HBI) was successfully synthesized by reacting hyperbranched polyester with isophorone diisocyanate. The molecular weight changes during the synthesis were monitored using gel permeation chromatography (GPC), and the structure and composition of IPDI were characterized by H-1 and C-13 nuclear magnetic resonance (NMR) spectroscopy. The structure of HBI was confirmed using various NMR techniques, and it was further reacted with methoxypolyethylene glycols (MPEG) to obtain a water-dispersible polyisocyanate with hyperbranched structure.
JOURNAL OF POLYMER RESEARCH
(2021)
Article
Polymer Science
Jiajun Zhou, Mao Li, Jiadong Wu, Chongyin Zhang, Zidong He, Yan Xiao, Gangsheng Tong, Xinyuan Zhu
Summary: A new kind of hyperbranched semi-aromatic poly(ester-imide)s with hydroxyl terminated groups has been successfully synthesized by a simple one-pot melting polymerization method, possessing low glass transition temperature and high thermostability, as well as abundant terminal hydroxyl functional groups.
Article
Biochemistry & Molecular Biology
Wenjun He, Lin Ye, Phil Coates, Fin Caton-Rose, Xiaowen Zhao
Summary: The addition of poly(lactide-co-caprolactone) (PLCL) segments into poly(L-lactic acid) (PLLA)/poly(D-lactic acid) (PDLA) chains resulted in the development of a fully biodegradable and flexible PLLA/D-PLCL block polymer with long-chain branches and a stereocomplex (SC) crystalline structure. The PLLA/D-PLCL films showed increased complex viscosity/storage modulus, lower tan delta values in the terminal region, and strain-hardening behavior compared to neat PLLA. Through biaxial drawing, the uniformity and non-preferred orientation of the PLLA/D-PLCL films were improved. By introducing PDLA, the phase structure transformed from a sea-island structure to a co-continuous network structure, leading to enhanced tensile strength and elongation at break.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Applied
Michal Chmielarek, Natalia Stopa
Summary: Propellants are widely used in various industries, especially in the armaments and space industries. The authors propose using HTPB derivatives as the main binder components to retain the basic parameters and compatibility of the propellant. The use of an isocyanate-free binder system opens up possibilities for new isocyanate-sensitive components.
CENTRAL EUROPEAN JOURNAL OF ENERGETIC MATERIALS
(2023)
Article
Polymer Science
Charles J. McCutcheon, Boran Zhao, Christopher J. Ellison, Frank S. Bates
Summary: Adding PEO-PBO diblock copolymer significantly reduces the crystallization time and increases the ductility of PLLA blends without affecting the modulus. The block copolymer particles facilitate stress-induced cavitation and uniform crazing, leading to a 7-15 fold increase in tensile toughness of the blends.
Article
Polymer Science
Fabien Salort, Steven K. Henning
Summary: Liquid poly(butadienes) with terminal silane function can enhance traction indicators and mitigate the negative hysteresis effect, forming a higher-molecular-weight structure by interacting with the silane coupling agent-modified surface of dispersed silica particles. This impacts the viscoelastic and mechanical properties of the elastomer phase positively.
RUBBER CHEMISTRY AND TECHNOLOGY
(2021)
Article
Polymer Science
Tao Zhang, Jingyu Shuai, Wenshuo Zhang, Huihui Liu, Ziru Gao, Qing Zhu, Xinghai Liu, Luyao Zhang, Houbin Li
Summary: A hyperbranched glycidol (HPG) was successfully synthesized and used as a cross-linking agent in polyurethane elastomers, resulting in improved mechanical properties. The HPG-based polyurethane elastomers exhibited high tensile strength and elongation at break, with slight effects on thermal stability and glass transition temperature.
Article
Engineering, Environmental
Xiaojie Chen, Ruanquan Zhang, Yixuan Mao, Liling Zhong, Peiyao Lin, Qizhe Deng, Botuo Zheng, Hang Shen, Zhiming Feng, Huagui Zhang
Summary: In this study, a series of dynamically cross-linked polysulfide elastomers were synthesized using inverse vulcanization, and they were blended with PLA to enhance its toughness and achieve good interfacial compatibilization. The composition of the elastomers played a decisive role in determining the toughening efficiency, and an optimized composition (PLA-S(50)O(25)A(25)) was obtained with excellent toughness and antibacterial effects. This study opens up new possibilities for PLA modification with sustainable dynamically-crosslinked elastomers, providing a balance between stiffness, toughness, and antibacterial activity.
CHEMICAL ENGINEERING JOURNAL
(2023)
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
Materials Science, Multidisciplinary
Shengjie Du, Shengyi Chen, Zekai Zhang, Zhicheng Ye, Huanv Mao, Huiting Yang, Cheng Lian, Chunyan Bao
Summary: In this study, a hydroxyl-terminated poly(amine-ester) hyperbranched polymer (HPAE-OHs) was used as a green, effective and economic corrosion inhibitor for mild steel. The results showed that HPAE-OHs can efficiently inhibit the corrosion of mild steel with a corrosion inhibition efficiency of 94.9% at a dosage of 100 mg/L.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Biotechnology & Applied Microbiology
Moslem Ahmadian, Mansoor Anbia
Summary: A low-cost and facile strategy has been developed to produce spherical micrometer sized SBA-15 with excellent diazinon adsorption properties. The adsorption behavior conforms to the Langmuir isotherm and pseudo second-order model, exhibiting good thermodynamic properties and cycle stability.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Engineering, Environmental
Xiaolong Han, Yujuan Jin, Jian Huang, Huafeng Tian, Maolin Guo
Summary: Hyperbranched polymer with flexible long chains was synthesized and used to toughen poly(3-hydroxybutyrate-co-3-hydroxyvalerate). The blends showed decreased crystallinity, increased impact strength, and elongation at break compared to the pure polymer.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2022)
