Article
Chemistry, Multidisciplinary
Jie Liu, Nan Zheng, Xin Min, Junhai Liu, Zhizhou Li, Xiaohui Ji
Summary: A novel two-step synthesis strategy based on a liquid neodymium phosphate ester catalyst was used to successfully synthesize diene-styrene di-block copolymers with high cis-1,4 unit content, overcoming the issue of traditional catalysts' insufficient activity. Characterization analysis confirmed that these materials exhibit good mechanical properties in harsh low temperature environments.
Article
Polymer Science
Xiangning Meng, Yingchun Li, Najla AlMasoud, Wensheng Wang, Taghrid S. Alomar, Jie Li, Xinming Ye, Hassan Algadi, Ilwoo Seok, Handong Li, Ben Bin Xu, Na Lu, Zeinhom M. El-Bahy, Zhanhu Guo
Summary: For the first time, styrene-butadiene-glycidyl methacrylate (SBG) was incorporated into the recovered acrylonitrile-butadiene-styrene (rABS) and recycled high impact polystyrene (rHIPS) system by melt blending to increase effectiveness. The epoxy groups in SBG react with the butadiene aging groups in rABS/rHIPS, resulting in the formation of ester groups, which repairs broken molecular chains, improves phase compatibility, and enhances mechanical properties of the blends. Adding SBG significantly improves the molecular weight, impact strength, tensile strength, flexural strength, storage modulus, loss modulus, and complex viscosity of the blends. When SBG content is 8 wt%, the notch impact strength of the blends increases by 108% compared to rABS/rHIPS. Furthermore, the interface between the polybutadiene (PB) phase and styrene-acrylonitrile copolymer (SAN) phase becomes less distinct, improving the compatibility and enabling high-value recovery of rABS/rHIPS.
Article
Polymer Science
Kai Zhang, Yanli Dou, Yang Jiang, Zhen Zhang, Shihui Li, Dongmei Cui
Summary: The copolymerization of ethylene and butadiene using various scandium complexes led to the successful preparation of high molecular weight and structurally regular E/BD copolymers, showing excellent mechanical and physical properties surpassing traditional rubbers.
Article
Materials Science, Multidisciplinary
Can Xu, Chuxuan Chen, Jing Jiang, Changwen Zhao, Yuhong Ma, Wantai Yang
Summary: This study reports a strategy to prepare monodisperse styrene-maleic anhydride-isoprene terpolymer microspheres via self-stabilized precipitation polymerization. The prepared microspheres have uniform particle sizes and narrow size distributions. The copolymerization proceeds in an alternating way between the electron donor and electron acceptor monomers, and isoprene is incorporated into the polymer chain through 1,4 addition. The gel fraction of microspheres varies with the feeding ratio of isoprene. The Diels-Alder reaction between maleic anhydride and isoprene can be effectively inhibited by adjusting the amount of initiator or polymerization temperature.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Polymer Science
Qianqian Yue, Yongfei Peng, Xingjian Liu, Aihua He, Huarong Nie
Summary: The addition of metal deactivators can effectively suppress the aging of TBIR, prolong its lifespan, and have no negative effects on its physical and processing properties. These research findings are of great importance for improving the stability and aging resistance of polymers.
Article
Thermodynamics
Hussam Cirmad, Seha Tirkes, Umit Tayfun
Summary: The study focused on loading expandable graphite (EG) into acrylonitrile-butadiene-styrene (ABS) terpolymer and analyzing the performance of the composites through various tests. Results showed that with an increase in EG content, certain mechanical properties of ABS improved, while elongation and impact strength exhibited a decreasing trend. The 15% and 20% EG-containing ABS composites were identified as the most suitable candidates among the prepared composites.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Polymer Science
Wen-jie Zheng, Ji-fu Bi, Ri-xin Cong, Feng Wang, Heng Liu, Yan-ming Hu, Xue-quan Zhang
Summary: Copolymerization of butadiene/isoprene and ternary copolymerization of butadiene/isoprene/myrcene were successfully conducted with a specific catalyst system. The resulting copolymers showed a random structure, as confirmed by the reactivity ratios and C-13-NMR analysis. Comparing different models, it was found that the Markov model was more suitable for simulating the copolymer sequence distribution.
ACTA POLYMERICA SINICA
(2021)
Article
Polymer Science
Qi-yuan Wang, Jian-ming Huang, Shi-hui Li, Dong-mei Cui
Summary: By utilizing rare-earth metal catalysts, stereoselective (co)polymerization of IP-OTBS can produce polar group functionalized conjugated diene rubbers, contributing to the enhancement of mechanical properties of green tires.
ACTA POLYMERICA SINICA
(2022)
Article
Anatomy & Morphology
Hao Zhang, Shanliang Zheng, Lina Zheng, Feng Liu, Yudian Song, Meng-Jiao Wang
Summary: This study focused on the improvement of performance of silica-filled SBR/BR blends using silane coupling agents, with experiments and SEM observations used to investigate microstructure changes during stretching.
MICROSCOPY RESEARCH AND TECHNIQUE
(2021)
Article
Polymer Science
Helena Svajdlenkova, Ondrej Sausa, Sergey V. Adichtchev, Nikolay V. Surovtsev, Vladimir N. Novikov, Josef Bartos
Summary: This study investigates the reorientation dynamics of TEMPO in cis-1,4-PIP10k and explores the correlation between TEMPO dynamics and free volume expansion. The findings suggest a close relationship between the characteristic ESR temperatures and characteristic PALS temperatures, providing insights into the factors influencing spin probe reorientation mobility in polymer systems.
Article
Chemistry, Inorganic & Nuclear
Suting Xu, Yanchen Huo, Xiang Hu, Fei Wang, Li Pan, Xiaochao Shi
Summary: In this study, rare-earth metal complexes bearing tetrahydrofluorenyl ligands were synthesized and characterized. These complexes showed excellent catalytic activity for the polymerization of styrene and butadiene, resulting in diblock copolymers with highly syndiotactic polystyrene block and a 1,4-specific PBD block. The study also revealed the significant difference in reactivity ratios between butadiene and styrene, supporting the block structure of the copolymers. Morphology and mechanical properties of the selected diblock copolymer were investigated.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Lijia Liu, Feng Wang, Chunyu Zhang, Heng Liu, Guangfeng Wu, Xuequan Zhang
Summary: A series of high thermal stability alpha-diimine nickel and cobalt complexes were revealed in this study, suitable for high-temperature polymerization of 1,3-butadiene. Increasing temperature can enhance the yield but decrease the molecular weight and cis-1,4- content of the resultant polymers.
MOLECULAR CATALYSIS
(2022)
Article
Polymer Science
Qingtao Niu, Junying Zhang, Aihua He
Summary: In this study, copolymerizations of isoprene and butadiene were conducted using different alkylaluminium-activated Ziegler-Natta catalysts. The use of AlEt3 resulted in higher activity and stereoselectivity, while AlOct(3) showed a higher Bd monomer reactivity ratio. The discrepancy between theoretical copolymer composition and experimental data mainly occurred in the initial polymerization stage.
POLYMER INTERNATIONAL
(2021)
Article
Microbiology
Natsuhei Suzuki, Daito Suda, Nguyen Thi Thuy Ngan, Namiko Gibu, Nguyen Lan Huong, To Kim Anh, Daisuke Kasai
Summary: The gram-positive rubber-degrading bacterium Nocardia farcinica NBRC 15,532 can utilize poly(cis-1,4-isoprene) as a carbon and energy source and produce metabolites. Two ALDH genes (NF2_RS14000 and NF2_RS14385) may be involved in the degradation of oligo-isoprene aldehydes.
Article
Chemistry, Multidisciplinary
Rika Fukushima, Olivier Tardif, Shojiro Kaita, Yasuo Wakatsuki, Yukihiro Kojima, Nobuaki Koga
Summary: This paper reports a computational study on the specific 1,4-cis polymerization of butadiene catalyzed by cationic gadolinium metallocene. A novel mechanism involving the cationic Gd catalyst is proposed to explain the selective polymerization.
CHEMISTRY-AN ASIAN JOURNAL
(2022)
