Synthesis and properties of bromide‐ functionalized poly(isobutylene‐co‐p‐ methylstyrene) random copolymer

Abstract

Poly(isobutylene-co-p-methylstyrene) (IB/p-MS) random copolymer is a new generation of polyisobutylene-based elastomers. The cationic copolymerization of IB with p-MS was thoroughly examined by using 2-chloro-2,4,4-trimethylpentane/ ethylaluminiumsesquichloride/electron donor as initiating system. IB/p-MS random copolymers with high molecular weight were obtained at elevated temperature through the addition of ethyl acetate; the reaction proceeded in a mildly exothermic manner. Although the reactivity ratios of comonomer pairs differ by close to an order of magnitude, p-MS was uniformly distributed in the chains. IB/p-MS random copolymer can be brominated by adding molecular bromine into the copolymer solution, thereby yielding a completely saturated polymer backbone with a chemically reactive site. The types and selection of appropriate vulcanization systems for bromide-functionalized IB/p-MS random copolymers are also discussed.

Cationic Copolymerization of Isobutylene with 4-Vinylbenzenecyclobutylene: Characteristics and Mechanisms

“…The living polymerization of IB has been realized, and researchers have also proposed living-polymerization mechanisms [1][2][3][4][5][6][7][8][9][10][11]. Copolymers with different structures and functions are obtained by the copolymerization of IB and other monomers [12][13][14][15][16]. Obtaining a functionalized copolymer by introducing a specific monomer during IB polymerization is an important research direction.…”

“…Therefore, 4-VBCB can be introduced into cationic copolymerization with IB. The vulcanization of the copolymer of IB and 4-VBCB has significant advantages over the vulcanization of other IB-based copolymers, such as IB-isoprene rubber and brominated IB-co-p-methylstyrene [14]. The crosslinking Similar to styrene, 4-VBCB is cationically polymerizable.…”

“…Therefore, 4-VBCB can be introduced into cationic copolymerization with IB. The vulcanization of the copolymer of IB and 4-VBCB has significant advantages over the vulcanization of other IB-based copolymers, such as IB-isoprene rubber and brominated IB-co-p-methylstyrene [14]. The crosslinking of 4-VBCB involves only heat and does not need the addition of a vulcanizing agent and an accelerator, such as sulfur, zinc oxide, xanthates, and quinoid chemical reagents, which are harmful to the human body and difficult to remove from the rubber matrix completely [21].…”

Characteristics and Mechanism of Vinyl Ether Cationic Polymerization in Aqueous Media Initiated by Alcohol/B(C6F5)3/Et2O

“…Chlorinated solvents seriously damage the environment, and their applications should be limited [9,10]. Under the advocacy of green chemistry, the use of environmentally benign solvents in cationic polymerization has been extensively studied, such as using fewer toxic solvents (e.g., toluene or n -hexane) [11,12,13], supercritical CO 2 [14,15], and ionic liquids [16,17,18,19,20]. Water is one of the most ideal polymerization solvents.…”

Synthesis of random copolymer of isobutylene with p-methylstyrene by cationic polymerization in ionic liquids

“…Poly(isobutylene-co-p-methylstyrene) (IB/p-MeSt) random copolymer is a new generation of PIB-based elastomer that contains several percentages of "reactive" p-MeSt. IB/p-MeSt random copolymer also has many properties, which are superior to the traditional butyl rubber (5,6). IB/p-MeSt random copolymer can only be synthesized by cationic polymerization.…”