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Effect of nano ribbons formed by the amide segment on the solvent resistivity of segmented block copolymers based on polystyrene
Author(s) -
Ekambaram Vakees,
Jayaselan Suresh,
Muthu Kayalvizhi,
Sekar Karthik,
Arun Araichimani
Publication year - 2018
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.24582
Subject(s) - materials science , copolymer , amide , crystallinity , polymer chemistry , polystyrene , polymer , polyamide , amorphous solid , solvent , condensation polymer , diamine , chemical engineering , composite material , crystallography , organic chemistry , chemistry , engineering
A segmented block copolymer is synthesized using dihydroxy terminated polystyrene (PSt) ( M W = 2,500 g/mol) and crystallizable amide segments. PSt length in the copolymer is varied from 2,500 to 10,000 g/mol using dimethylterephthalate (T). Amide segment is synthesized in situ using diamine‐diamide 6 X 6 ( X = A or T) (synthesized by dimethylterepthalate [T], adipic acid [A], and hexamethylenediamine [6]) and T. This work is to modify the high T g amorphous PSt to a semicrystalline copolymers (‐(PSt‐T) y ‐6X6‐T‐)‐ n ). These copolymers have a very high inherent viscosity and depending on the amide concentration, the melting temperature of the polymers was ranged between 129°C and 248°C. The crystallinity of the amide segments is up to 75%. The AFM analysis showed the presence of crystalline ribbons with a high aspect ratio. All the polymers show single stage decomposition temperature centered around 420°C. The solvent resistivity of these materials is very high even at a low concentration of (5 wt%) amide content. POLYM. ENG. SCI., 58:361–368, 2018. © 2017 Society of Plastics Engineers