Open AccessNovel star‐block polymers: Three polyisobutylene‐ b ‐poly(methyl methacrylate) arms radiating from an aromatic core
Author(s) -
Keszler B.,
Fenyvesi Gy.,
Kennedy J. P.
Publication year - 2000
Publication title -
journal of polymer science part a: polymer chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.768
H-Index - 152
eISSN - 1099-0518
pISSN - 0887-624X
DOI - 10.1002/(sici)1099-0518(20000215)38:4<706::aid-pola5>3.0.co;2-d
Subject(s) - polymer chemistry , glass transition , thermogravimetric analysis , cationic polymerization , isobutylene , methyl methacrylate , materials science , differential scanning calorimetry , polymerization , radical polymerization , polymer , poly(methyl methacrylate) , chemistry , composite material , copolymer , organic chemistry , physics , thermodynamics
A series of novel three‐arm star blocks consisting of three polyisobutylene‐ b ‐poly(methyl methacrylate) (PIB‐ b ‐PMMA) diblocks radiating from a tricumyl core were synthesized, characterized, and tested. The synthetic strategy involved three steps: the synthesis of Cl t ‐tritelechelic PIB by living cationic isobutylene (IB) polymerization, the conversion of the Cl t termini to isobutyryl bromide groups, and the initiation of living radical methyl methacrylate (MMA) polymerization by the latter groups. The PIB and PMMA segment lengths (M n 's ) could be controlled by controlling the conditions of the living cationic and radical polymerizations of IB and MMA, respectively. Core destruction analysis directly proved the postulated three‐arm microarchitecture. The structures of the products were analyzed by 1 H NMR and Fourier transform infrared spectroscopies, and their thermal properties were analyzed by differential scanning calorimetry and thermogravimetric analysis. The presence of a low‐ and a high‐temperature glass transition (T g, PIB ∼ −63°C, T g, PMMA ∼ 120°C ) indicated a phase‐separated micromorphology. Stress/strain analysis showed a tensile strength of up to ∼ 22.9 MPa and an elongation of ∼ 200%. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 706–714, 2000