Article
Polymer Science
Mohammad Yasir, Andreas F. M. Kilbinger
Summary: Norbornene and cyclohexene show different polymerization behaviors using Grubbs' catalysts due to their varying ring strain energy levels; a sequence-selective cascade polymerization of a monomer containing both rings resulted in polymers with moderate molecular weight dispersities and good control over molecular weight.
Review
Polymer Science
Jiaxi Xu, Nikos Hadjichristidis
Summary: The incorporation of heteroatom-containing weak bonds along polymer backbones has become a popular tool to accelerate degradation. Many methods have been reported for the synthesis of degradable heteroatom-containing polymers based on step-growth polymerization and chain-growth ring-opening polymerization. Ring-opening metathesis polymerization has emerged as an approach for the synthesis of various types of degradable polymers. This review covers the synthesis of different heteroatom-containing degradable polymers via ring-opening metathesis polymerization and their degradation mechanisms under different conditions.
PROGRESS IN POLYMER SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Phong K. Quach, Jesse H. Hsu, Ivan Keresztes, Brett P. Fors, Tristan H. Lambert
Summary: The ring-opening metathesis polymerization of cyclopropenes using hydrazonium initiators was investigated. The initiators, formed by condensing 2,3-diazabicyclo[2.2.2]octane and an aldehyde, polymerize cyclopropene monomers through a sequence of [3+2] cycloaddition and cycloreversion reactions. The study showed that the monomer to initiator ratio had a positive correlation with the degree of polymerization.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Yujin Cha, JiHyeon Hwang, Luis Ramos, Huina Lin, Tianyu Zhu, Chuanbing Tang
Summary: The synthesis of cyclic cobaltocenium and its application in the synthesis of high-performance copolymers have been reported.
Article
Polymer Science
Sebla Onbulak, Marc A. Hillmyer
Summary: The synthesis of sequence-controlled poly(ethylene-co-styrene) copolymers is challenging due to limitations in catalytic olefin polymerizations. An alternative method using ROMP of cyclic olefins followed by hydrogenation can generate ethylene copolymers with regioregularity. Investigating the ROMP of low-strain cyclododecenes provided useful information for mechanistic aspects of polymerization.
Article
Chemistry, Multidisciplinary
Ki-Young Yoon, Jinkyung Noh, Quan Gan, Julian P. Edwards, Robert Tuba, Tae-Lim Choi, Robert H. Grubbs
Summary: The study presents a continuous circular process for the scalable synthesis of pure cyclic polymers. This process utilizes silica-supported ruthenium catalysts and newly designed glassware to enable polymerization, polymer separation, and catalyst recovery in situ. The process minimizes manual labor, maximizes catalyst security, and guarantees the purity of cyclic polymers.
Article
Chemistry, Multidisciplinary
Dmitry S. Belov, Logesh Mathivathanan, Melanie J. Beazley, William Blake Martin, Konstantin V. Bukhryakov
Summary: The study explores the capability of an iron-based catalyst in performing ring-opening metathesis polymerization of olefins, demonstrating that the use of in situ prepared heteroleptic iron catalysts significantly enhances polymerization rate and selectivity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Polymer Science
Huiqun Wang, Sebla Onbulak, Steven Weigand, Frank S. Bates, Marc A. Hillmyer
Summary: The researchers synthesized a series of polyethylene-graft-aPP graft copolymers and found that increasing aPP content led to decreased melting temperatures and glass transition temperatures of PE, as well as decreased crystallinity. Additionally, the linear viscoelastic behavior of the PE-g-aPP graft copolymers exhibited greatly enhanced dynamic modulus and complex viscosity, with the effect increasing as side chain number and/or length increased.
Review
Chemistry, Applied
Nina Guy, Olivia Giani, Sebastien Blanquer, Julien Pinaud, Jean-Jacques Robin
Summary: Photopolymerization is gaining interest in both industrial and academic fields due to its high reaction kinetics, low emissions of organic solvents, and reduced shrinking stress. This method has mainly been developed for radical polymerization of vinyl monomers and to a lesser extent for ring-opening polymerization (ROP). With the emergence of new initiating systems, the photopolymerization of various cyclic monomers has expanded beyond epoxides, which were the first monomers polymerized by cationic ring-opening polymerization (CROP).
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Polymer Science
Chia-Jung Lin, Yi-Hao Lin, Tai-Chin Chiang, Chin-Yang Yu
Summary: Well-defined norbornene-based homopolymers and block copolymers with low polydispersity index and close to theoretical molecular weight were synthesized using the third-generation Grubbs' initiator. These polymers exhibit aggregation-induced emission characteristics and high emission in solid and aggregate states. They show strong sensing ability for aniline in the aggregated state with a detection limit of 5 x 10-6 M.
Article
Polymer Science
Mohammad Yasir, Manvendra Singh, Andreas F. M. Kilbinger
Summary: A mechanistically unique and efficient method for preparing heterotelechelic polymers through ring-opening metathesis polymerization using a single functionalization agent is reported. This method offers simplicity and efficiency, as different functionalization agents can be synthesized from inexpensive commercial starting materials to achieve the synthesis of heterotelechelic polymers.
Article
Chemistry, Multidisciplinary
Zhen Yu, Meng Wang, Xu-Man Chen, Shuai Huang, Hong Yang
Summary: The novel macrobicyclic olefin system shows good selectivity and high stereoselectivity in ROMP, with sacrificial cleavage of the silyloxide bridge providing clean-structured, non-auxiliaried polymers.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Hongyuan Bai, Li Han, Xuefei Wang, Hong Yan, Haitao Leng, Siwei Chen, Hongwei Ma
Summary: In this study, a strategy to synthesize unique C7 and C8 skeleton polymers through living anionic polymerization was proposed. The polymerization behavior of two diene monomers with high ring strain substituents was investigated. It was found that the content of C4 and C7/C8 skeleton structures in the chain can be controlled by adjusting the mode of monomer additions.
Article
Polymer Science
Deniz Coban, Olga Gridina, Matthias Karg, Andre H. Groeschel
Summary: This study describes design rules for controlling the morphology of multicompartment micelles (MCMs) in water and proposes a method to predict the final MCM shape based on the molar ratio of PEO to PMA.
Article
Polymer Science
Honggang Mei, Bingjie Zhao, Huaming Wang, Sixun Zheng
Summary: The preparation of crosslinked PDCPD nanoparticles via ROMP-induced self-assembly approach was reported in this communication. The morphology of the obtained nanoparticles varied from spherical, cylindrical to planar depending on the molecular weights of Macro-CTAs, the concentrations of DCPD and the natures of solvents. The ROMPISA method provides a new and efficient approach to prepare crosslinked polymer nanoparticles.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
