Polyisobutylene containing organic/inorganic hybrid block copolymers and their crystalline behavior

Abstract

Block copolymer comprising of polyisobutylene (PIB) soft segment and poly(3‐(3,5,7,9,11,13,15‐heptaisobutyl‐pentacyclo[9.5.1.13,9.15,15.17,13]‐octasiloxane‐1‐yl)propyl methacrylate) (PMAPOSS) hard segment was synthesized by combination of living carbocationic and reversible addition‐fragmentation chain transfer (RAFT) polymerizations. Block copolymers were characterized by 1H and 29Si NMR spectroscopy, FT‐IR study, energy dispersive X‐ray spectroscopy (EDX), and gel permeation chromatography (GPC). The EDX, combined with scanning electron microscopy (SEM) was employed for determination of elemental composition. Thermal transition and degradation behaviors were confirmed by differential scanning calorimetry (DSC) and thermo gravimetric analysis (TGA), respectively. Although both the PIB and MAPOSS homopolymers are amorphous in nature, in their block copolymers the PMAPOSS domain showed crystalline behavior, as confirmed from wide‐angle X‐ray scattering (WAXS) technique, DSC studies and polarized optical microscopy (POM). Interestingly, crystalline melting temperatures (Tm) can be tuned by changing the PIB to PMAPOSS block length ratios. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 1125–1133

Block Copolymer Synthesis by the Combination of Living Cationic Polymerization and Other Polymerization Methods

“…Self-healing gel was constructed from side-chain primary amine leucine pendant with PIB. The diblock copolymer P(H 2 N-Leu-HEMA)- b -IB) ( P14 ) was synthesized using PIB based di-functionalized cross-linker (HOC-PIB-CHO) without aiding any external stimuli ( Haldar et al, 2015b ). They show well defined crosslinking and are self-healing, thus finding a wide range of applications in organ repair and pH-triggered delivery.…”

High‐density polyethylene/expanded graphite nanocomposites produced by polymerization‐filling technique using an industrial heterogeneous catalyst

“…Within the PE family, the high‐density polyethylene (HDPE) stands out for its high tensile strength, which results from its crystalline structure, high molecular weight, and low branch content. In addition, some improvements in the mechanical properties, stiffness, thermal stability, chemical resistance, high barrier properties, and flame retardancy have been achieved with the use of organic and inorganic nanomaterials as fillers into the polymer matrix …”

Utilising alternative modifications of α-olefin end groups to synthesise amphiphilic block copolymers

“…1 Therefore, materials that incorporate PIB such as PIB macromonomers, 2,3 polymer networks, amphiphilic polymer co-networks (APCN) [4][5][6][7][8] and block copolymers continue to attract much attention. [9][10][11][12] PIB based block copolymers, which are copolymers that contains at least one discreet block of pure IB, can typically be synthesised via four generic synthetic approaches; sequential monomer addition, site transformation of the PIB end group, macromolecular coupling of homopolymers and dual-site initiators. Sequential monomer addition can be achieved by direct addition of a second monomer following the living cationic polymerisation (LCP) of IB, a living PIB end group will initiate and subsequently polymerise said second monomer to furnish a block copolymer.…”