Phase relationships of rigid rod polymer/flexible coil polymer/solvent ternary systems | Zendy

Hwang WF. | Zendy; Wiff D. R. | Zendy; Verschoore C. | Zendy

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Phase relationships of rigid rod polymer/flexible coil polymer/solvent ternary systems

Author(s) -

Hwang WF.,

Wiff D. R.,

Verschoore C.

Publication year - 1983

Publication title -

polymer engineering and science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.503

H-Index - 111

eISSN - 1548-2634

pISSN - 0032-3888

DOI - 10.1002/pen.760231408

Subject(s) - materials science , polymer , ternary operation , phase (matter) , polymer chemistry , solvent , phenylene , chemical engineering , composite material , organic chemistry , chemistry , computer science , engineering , programming language

Phase diagrams of two types of rigid rod polymer/flexible coil polymer/methanesulfonic acid (MSA) ternary systems were determined by polarized optical microscopy at ambient conditions. The rigid rod polymer is a wholly aromatic high temperature resistant (no measurable T g ) poly ( p ‐phenylenebenzobisthiazole) (PPBT). One of the flexible coil polymers is a wholly aromatic high temperature resistant poly (2,5′(6′) benzimidazole) (ABPBI), the other is a thermoplastic poly[2,2′ ‐(1–4‐phenylene)‐6,6′ ‐bis (3‐phenyl‐quinoxaline)] (PPQ) with T g of 359°C. The solvent is methane‐sulfonic acid (MSA). The experimentally determined critical concentration points, C cr , are in excellent agreement with Flory's recent theory. Total phase segregation between the polymer pair in ternary solution was predicted and observed at C > C cr . Different decomposition mechanisms of phase separation were observed as a function of concentration.

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