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The effect of terminal alkyl chains on hyperbranched polyesters based on 2,2‐bis(hydroxymethyl)propionic acid
Author(s) -
Malmström Eva,
Johansson Mats,
Hult Anders
Publication year - 1996
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.1996.021971012
Subject(s) - hydroxymethyl , polyester , alkyl , polymer chemistry , terminal (telecommunication) , chemistry , organic chemistry , telecommunications , computer science
A hyperbranched hydroxyfunctional polyester based on 2,2‐bis(hydroxymethyl)propionic acid as AB 2 ‐monomer and a tetrafunctional polyol as core was end‐capped with five different alkylacyl chlorides. Alkyl chain lengths ranging from three to sixteen carbons were used. Short alkyl chains (3–6 carbons) decrease the glass transition temperature from around 30°C for the hydroxyterminated polyester to temperatures well below zero. With a sufficiently long alkyl chain (12–16 carbons) the polymers tend to crystallize. The polyesters with C 16 ‐chains as terminal groups exhibit several different crystalline phases as revealed by differential scanning calorimetry. From X‐ray data it was possible to suggest that the crystallization for the C 16 ‐terminated samples occurs in a non‐interpenetrating fashion for the larger sample and in an interpenetrating way for the smaller polymers.