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Phase behavior and crystallization in blends of a low molecular weight polyethylene-block-poly(ethylene oxide) diblock copolymer and poly(hydroxyether of bisphenol A)

journal contribution
posted on 2006-12-01, 00:00 authored by Qipeng Guo
The phase behavior, morphology and crystallization in blends of a low-molecular-weight (Mn = 1400) double-crystalline polyethylene-block-poly(ethylene oxide) (PE-PEO) diblock copolymer with poly(hydroxyether of bisphenol A) (PH) were investigated by differential scanning calorimetry, transmission electron microscopy and small-angle X-ray scattering. The symmetric PE-PEO diblock copolymer consists of a PH-miscible PEO block and a PH-immiscible PE block. However, PH only exhibits partial miscibility with the PEO block of the copolymer in the PH/PE-PEO blends; both macrophase and microphase separations took place. There existed two macrophases in the PH/PE-PEO blends, i.e., a PH-rich phase and a PE-PEO copolymer-rich phase. The PE block of the copolymer in the blends exhibited fractionated crystallization behavior by homogeneous nucleation. There appeared three crystallization exotherms related to the crystallization of the PE block within three different microenvironments in the PH/PE-PEO blends.

History

Journal

Thermochimica acta

Volume

451

Issue

1-2

Pagination

168 - 173

Publisher

Elsevier BV

Location

Amsterdam, Netherlands

ISSN

0040-6031

eISSN

1872-762X

Language

eng

Notes

Available online 14 September 2007.

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2006, Elsevier B.V.