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A New Crystal Form, Polymorphism, and Multi‐Morphology in Biodegradable Poly(3‐hydroxypropionate)
Author(s) -
Zhu Bo,
He Yong,
Asakawa Naoki,
Yoshie Naoko,
Nishida Haruo,
Inoue Yoshio
Publication year - 2005
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200400634
Subject(s) - crystallization , polymorphism (computer science) , morphology (biology) , fusion , melting temperature , materials science , crystal (programming language) , kinetics , melting point , chemical engineering , enthalpy of fusion , crystallography , polymer chemistry , chemistry , composite material , organic chemistry , biology , biochemistry , physics , genetics , linguistics , philosophy , quantum mechanics , computer science , genotype , engineering , gene , programming language
Summary: A new crystal morphology ( δ form) of poly(3‐hydroxypropionate) (PHP) is found in cast and melt‐crystallized PHPs with low molecular weight, in which the PHP chains possibly adopt a 2 1 helix rather than the trans conformation found in the β or γ form. The fusion temperature‐ and the crystallization temperature‐dependent polymorphism are responsible for the dual morphologies and the unique growth kinetics of spherulites in the melt‐crystallized PHPs.a) A dual‐morphology developed at 70 °C in PHP films after melting at 117 °C and b) that formed during cooling at a rate of 1 °C · min −1 from 130 °C.
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