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Preparation of Block Copolymers with a Single T g Based on Segments of Poly(oxy‐2,6‐dimethyl‐1,4‐phenylene) and Polycarbonate of Bisphenol A
Author(s) -
Penco Maurizio,
Sartore Luciana,
Della Sciucca Stefania,
Di Landro Luca,
Mendichi Raniero,
Samperi Filippo
Publication year - 2006
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200600151
Subject(s) - copolymer , polymer chemistry , polycarbonate , materials science , thermal stability , rheometry , glass transition , polymer , phenylene , condensation polymer , bisphenol a , chemistry , organic chemistry , composite material , epoxy
Summary: The synthesis and the properties of block copolymers based on PPO and PC segments are reported. Copolymers that have a multi‐block structure are synthesized by a polycondensation reaction that employs oligomeric PPO and PC diol terminated with phosgene or bischloroformate of bisphenol A. In the reaction scheme two steps are involved: first, the reaction of one of the oligomeric diols (PPO or PC) with the bischloroformate or phosgene; second, the oligomeric bischloroformate is reacted with the other diol. The molecular characteristics of the prepared samples are studied by SEC, 1 H and 13 C NMR, and FT‐IR spectroscopy. The thermal and rheological properties and the thermal stability have also been investigated by means of DSC, rotational rheometry, and TGA, respectively. Polymers that have a single glass transition temperature are obtained if low‐molecular‐weight segments are used. From a rheological point of view, these materials show a remarkably lower melt viscosity compared with a PPO homopolymer that has a comparable average molecular weight.Rheometric curves of PPO‐ b ‐PC (3) compared with a commercial PPO.