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Formation of Crystallosolvates from Mixtures of Poly(L-lactide) and Diphenyl Ether

✍ Scribed by Hajime Nakajima; Isao Wataoka; Hitomi Ohara; Yoshiharu Kimura

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
427 KB
Volume
210
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Poly(L‐lactide) (PLLA) was mixed homogeneously with diphenyl ether (DE) at high temperature in a range of PLLA/DE compositions from 100/0 to 100/75 in wt.‐%. Cooling of the mixtures yielded white solid products without migration of the liquid DE. Their melting temperature was lowered from 173 to 123 °C as the DE content increased. At an optimum PLLA/DE composition of 100/60, a unique crystallosolvate consisting of large spherulite of PLLA, as detected using polarized optical microscopy, was exclusively generated in powder form. Wide and small angle X‐ray scattering revealed that the PLLA chains form a lamellar structure with a highly ordered crystalline state (α‐form) and that the lamellar spacing is extraordinarily thick, reaching 34 nm. It was therefore suggested that DE partitions into the amorphous layers sandwiched between the crystalline layers and that the specific solvation interaction between DE and PLLA may stabilize the crystallosolvates.

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