Article
Polymer Science
KaitlinR. Albanese, Yoichi Okayama, Parker T. Morris, Matthias Gerst, Rohini Gupta, Joshua C. Speros, Craig J. Hawker, Chungryong Choi, Javier Read de Alaniz, Christopher M. Bates
Summary: We report a strategy to create degradable poly(acrylate) pressure-sensitive adhesives (PSAs) using 1,2-dithiolanes as drop-in replacements for traditional acrylate comonomers. The resulting PSA materials have comparable thermal and viscoelastic properties to nondegradable analogues, but can undergo reversible transformation between high and low molecular weights through oxidative repolymerization and reductive degradation. This simple and versatile chemistry could play a pivotal role in improving the sustainability of contemporary adhesives.
Article
Polymer Science
Akhil Dev, Alexander Roesler, Helmut Schlaad
Summary: The acyclic monoterpene beta-myrcene is polymerized by anionic polymerization using sec-butyllithium as the initiator and DL-limonene as a solvent at room temperature. The polymerization process is living, producing polymyrcenes with narrow molar mass distribution and high content of 1,4 units, as well as block copolymers.
Article
Polymer Science
Min Su, Yu-Jing Sheng, Yu-Jiao Chen, Tao Li, Quan-Xi Shi, Hang Xiao, Meng-Qin Pu, Hongli Bao, Wen-Ming Wan
Summary: A versatile living polymerization method is reported, which allows the precise synthesis of narrow distributed polystyrenes through the introduction of a well-established all-in-one covalent-anionic-radical Barbier strategy, using a wide variety of organohalides as initiators under mild conditions.
Article
Polymer Science
Raita Goseki, Shogo Miyai, Satoshi Uchida, Takashi Ishizone
Summary: The study evaluated the polymerizability of novel exomethylene monomers based on an adamantyl skeleton under anionic, cationic, and radical conditions. It was found that 2-methyleneadamantane (MAd) formed dimeric compounds predominantly due to beta-hydrogen elimination, while 2-allylideneadamantane (AAd) polymerized successfully under all conditions, with anionic polymerization producing high-quality polymer with a specific microstructure.
Article
Polymer Science
Naganath Patil, Yves Gnanou, Xiaoshuang Feng
Summary: By adding Lewis acid such as triethylborane (TEB), the copolymerization of o-phthalaldehyde (OPA) with various epoxides has been successfully carried out under ambient conditions, resulting in the formation of polyacetals. The role and effect of TEB, its amount, and the feeding ratio of OPA to epoxides during their copolymerizations were investigated. The successful copolymerization was further extended to the synthesis of polyether-b-polyacetal block copolymers with different structure and properties.
Article
Polymer Science
Tian Zhang, Eamonn D. Conrad, Derek P. Gates
Summary: The living anionic polymerization of phosphaalkene has been used to synthesize a series of PMP homopolymers and PMP/S block copolymers. The samples showed monodispersity, narrow dispersities, and specific transition temperatures in their DSC chromatograms.
Article
Chemistry, Organic
Max Born, Thomas C. Fessard, Lucas Goettemann, Jakob Plank, Thomas M. Klapoetke
Summary: This study presents a new method for the synthesis of poly(3-azidooxetane), which offers increased yield and improved safety compared to its precursor, 3-azidooxetane. The thermal behavior, energetic performance, plasticizer compatibility, and curing of poly(3-azidooxetane) were thoroughly investigated, and it was found to be a suitable substitute for GAP, with potentially more environmentally friendly properties.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Christoph Hahn, Moritz Rauschenbach, Holger Frey
Summary: We report the first anionic polymerization of 1-vinylcyclohexene (VCH). The obtained polymers have well-controlled molecular weights and narrow molecular weight distributions. The microstructure of the resulting P(VCH) can be altered by the addition of a modifier (THF), resulting in increased 3,4-microstructure and elevated glass-transition temperature.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Raita Goseki, Taro Koizumi, Reina Kurakake, Satoshi Uchida, Takashi Ishizone
Summary: Anionic polymerizations of 4-chlorostyrene, 4-bromostyrene, and 4-iodostyrene were successfully carried out at low temperatures using sec-butyllithium or oligo(alpha-methylstyryl)lithium as initiators. The choice of initiators and conditions allowed for control of the molecular weight distribution and molecular weights of the resulting polymers. The addition of cesium phenoxide as an additive led to the production of polymers with narrow molecular weight distributions and predictable molecular weights.
Article
Polymer Science
Shivani P. Wadgaonkar, Manfred Wagner, Axel H. E. Mueller, Holger Frey
Summary: A silicon-containing functional monomer, 4-allyldimethylsilylstyrene (4ADSS), was synthesized through a Grignard reaction. The anionic polymerization and polymerization via the styrene vinyl bond of 4ADSS were studied, leading to the synthesis of P4ADSS samples with high molecular weight. The copolymerization of 4ADSS with styrene resulted in gradient copolymers with a wide range of molecular weights.
Article
Polymer Science
Yujiro Hiraki, Masaya Terasaki, Kaoru Adachi
Summary: In this study, well controlled living anionic polymerization of vinyl monomers was achieved using the BnTMS/t-BuOK initiator system with appropriate additives, leading to the synthesis of a block copolymer.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Min Su, Meng-Qin Pu, Hang Xiao, Yu-Jiao Chen, Wen-Ming Wan
Summary: This article reports a universal polymerization method that utilizes super-Grignard reagents (R2Mg·LiCl) to achieve low D and reactive hydrogen compatibility, enabling successful polymerization of various monomers with high conversion and low D under mild conditions. The method is adaptable to different initiators, polymerization temperatures, and feed ratios, making it attractive for a wide range of polymer synthesis applications.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yu-Sheng Liu, Eva Harth
Summary: The introduction of m-xylyl substituents to alpha-diimine Pd-II catalyst promotes living ethylene polymerization, leading to high molecular weight polyethylene with low branching. The m-xylyl groups effectively block the axial sites of the catalytic center, preventing chain-transfer and easy accessibility of polar monomers, resulting in a living polymerization. Incorporating different acrylate block sequences can significantly modify the mechanical and chemical properties of block copolymers to be a hard plastic, elastomer, or semi-amorphous polymer.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Polymer Science
Cynthia G. Flores-Hernandez, Maria de los Angeles Cornejo-Villegas, Abigail Moreno-Martell, Alicia Del Real
Summary: The study aimed to obtain a new biodegradable graft polymer through two chemical processes, FTIR and TGA analysis confirmed its structure and thermal properties, with strong impact on fungal growth.
Article
Polymer Science
Daisuke Tanioka, Kaoru Adachi
Summary: The chain-growth polymerization of a 1,1-diphenylethylene (DPE) derivative was achieved using addition-isomerization anionic polymerization. The addition of a carbanion to the monomer resulted in the generation of a sterically hindered DPE anion, which subsequently underwent isomerization by abstraction of the methyl proton on a phenyl group to form a less hindered benzyl anion. Other DPE derivatives without both o-methyl and o-methoxy groups were unable to polymerize.
Article
Physics, Multidisciplinary
Rugang Geng, Ram C. Subedi, Hoang M. Luong, Minh T. Pham, Weichuan Huang, Xiaoguang Li, Kunlun Hong, Ming Shao, Kai Xiao, Lawrence A. Hornak, Tho D. Nguyen
PHYSICAL REVIEW LETTERS
(2018)
Article
Polymer Science
Wei Lu, Andrew Goodwin, Yangyang Wang, Panchao Yin, Weiyu Wang, Jiahua Zhu, Ting Wu, Xinyi Lu, Bin Hu, Kunlun Hong, Nam-Goo Kang, Jimmy Mays
Article
Polymer Science
Hong-Hai Zhang, Yu-Xing Zhu, Weiyu Wang, Jiahua Zhu, Peter V. Bonnesen, Kunlun Hong
Article
Nanoscience & Nanotechnology
Maria Cecilia Evora, Xinyi Lu, Nitilaksha Hiremath, Nam-Goo Kang, Kunlun Hong, Roberto Uribe, Gajanan Bhat, Jimmy Mays
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2018)
Article
Polymer Science
Naresh C. Osti, Eugene Mamontov, Luke Daemen, James F. Browning, Jong Keum, Hoi Chun Ho, Jihua Chen, Kunlun Hong, Souleymane O. Diallo
JOURNAL OF APPLIED POLYMER SCIENCE
(2019)
Article
Materials Science, Multidisciplinary
Chuanxu Ma, Zhongcan Xiao, Jingsong Huang, Liangbo Liang, Wenchang Lu, Kunlun Hong, Bobby G. Sumpter, J. Bernholc, An-Ping Li
PHYSICAL REVIEW MATERIALS
(2019)
Review
Polymer Science
Weiyu Wang, Wei Lu, Andrew Goodwin, Huiqun Wang, Panchao Yin, Nam-Goo Kang, Kunlun Hong, Jimmy W. Mays
PROGRESS IN POLYMER SCIENCE
(2019)
Article
Polymer Science
Keith D. Hendren, Sarita A. Hough, Kenneth Knott, Wei Lu, Paul A. Deck, E. Johan Foster
Summary: Cellulose nanocrystals (CNCs) were functionalized with various loadings of metallocene catalyst and subjected to in situ polymerization with ethene and 1-hexene to produce linear low-density polyethene (LLDPE) polymer matrix composites (PMCs). Analytical techniques revealed properties and mechanical behaviors of the resulting PMCs, showing an overall increase in storage modulus with increasing CNC content and significant differences in Young's modulus and elongation at break between different CNC loadings. The study suggests that incorporating smart CNCs into ethane-based polymers through this method may lead to enhanced mechanical properties.
POLYMER INTERNATIONAL
(2021)
Article
Polymer Science
Huiqun Wang, Weiyu Wang, Wei Lu, Masashi Osa, Nam-Goo Kang, Kunlun Hong, Jimmy Mays
Summary: This study investigates the relationship between chain flexibility and microstructure of linear PBFs with narrow molecular weight distribution. The research reveals that PBF has the highest characteristic ratio among all reported polydienes, and no previous studies have correlated chain flexibility with the microstructure of PBF.
Article
Polymer Science
Tianyu Li, Hui Li, Huiqun Wang, Wei Lu, Masashi Osa, Yangyang Wang, Jimmy Mays, Kunlun Hong
Summary: The relationship between chain microstructure and glass transition temperature (T-g) is complex for poly(alkyl methacrylate)s and poly(alkyl acrylate)s. As the side chain length increases, chain flexibilities and T(g) decrease, reflecting increased hindrances to rotation about backbone bonds. The differences in T-g between poly(n-alkyl acrylate)s and poly(n-alkyl methacrylate)s may be attributed to their differences in tacticity.
Article
Biochemistry & Molecular Biology
Maria Varghese, Farihah Haque, Wei Lu, Mark W. Grinstaff
Summary: Polysaccharides play an important role in biomedical applications, but their preparation faces challenges. This study presents a synthetic strategy to regioselectively functionalize polysaccharides using post-polymerization modification reactions. This new method provides a new approach for obtaining functional polysaccharide mimetics for biomedical applications.
Article
Multidisciplinary Sciences
Ruiqing Xiao, Jialiu Zeng, Eric M. Bressler, Wei Lu, Mark W. Grinstaff
Summary: This study presents the synthesis of (1 -> 6)-beta-glucose-branched poly-amido-saccharides as glycan-mimetics and demonstrates macrophage stimulation and polarization.
NATURE COMMUNICATIONS
(2022)
Article
Polymer Science
Zipeng Xu, Ruikun Sun, Wei Lu, Shalin Patil, Jimmy Mays, Kenneth S. Schweizer, Shiwang Cheng
Summary: Understanding the nonequilibrium dynamics of topologically entangled polymers under strong external deformation has been a grand challenge in polymer science for more than half a century. This article presents new experimental and theoretical developments to investigate the steady-state shear viscosity of entangled polymer melts at high Rouse Weissenberg numbers. The results reveal shear-thinning behavior and a dynamic scaling model is proposed to explain this behavior.
Article
Materials Science, Multidisciplinary
Tucker L. Murrey, Kunping Guo, Justin T. Mulvey, Owen A. Lee, Camila Cendra, Zaira I. Bedolla-Valdez, Alberto Salleo, Jean-Francois Moulin, Kunlun Hong, Adam J. Moule
JOURNAL OF MATERIALS CHEMISTRY C
(2019)
Article
Multidisciplinary Sciences
Zhongcan Xiao, Chuanxu Ma, Jingsong Huang, Liangbo Liang, Wenchang Lu, Kunlun Hong, Bobby G. Sumpter, An-Ping Li, Jerzy Bernholc
ADVANCED THEORY AND SIMULATIONS
(2019)