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Control of crystalline modifications of poly( p ‐xylylene) by copolymerization
Author(s) -
Smarsly Bernd,
BrinkSpalink Friedel,
Schäfer Oliver,
Schmidt Claudia,
Greiner Andreas,
Ruland Wilhelm,
Wendorff Joachim H.
Publication year - 1999
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/(sici)1521-3935(19990401)200:4<714::aid-macp714>3.0.co;2-6
Subject(s) - copolymer , xylylene , polymer chemistry , polymerization , chemical modification , materials science , crystal structure , chemistry , polymer , crystallography , organic chemistry
Poly( p ‐xylylene) (PPX), phenylethyl‐substituted PPX (PEPPX) and copolymers of both were synthesized by base‐induced dehydrohalogenation of corresponding 4‐chloromethyltoluenes. Analysis of the crystal structure of PEPPX by X‐ray diffractometry reveals close resemblance of its unit cell with the unit cell of PPX in its α ‐modification. The crystalline morphology of as‐polymerized PPX can be described as a mixed modification consisting of α ‐ and β ‐crystals. However, copolymers of PPX and PEPPX show predominantly the α ‐crystals, even at very low ratio of PEPPX moieties in the copolymer. Conversion of the α ‐modification to the β ‐modification cannot be accomplished by annealing of copolymers above 200°C, which is in contrast to PPX homopolymers.