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Blends of poly(ethylene terephthalate) with Co[poly(ethylene terephthalate‐ p ‐oxybenzoate)]. III. Crystallization behavior observed by polarized light microscopy
Author(s) -
Ou ChengFang,
Lin ChenChong
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19960829)61:9<1447::aid-app3>3.0.co;2-j
Subject(s) - copolyester , ethylene , materials science , nucleation , crystallization , polarized light microscopy , optical microscope , poly ethylene , polymer chemistry , morphology (biology) , chemical engineering , composite material , polyester , scanning electron microscope , chemistry , organic chemistry , optics , physics , biology , engineering , genetics , catalysis
Poly(ethylene terephthalate) (PET) has been melt‐mixed at 293°C with two types of co[poly(ethylene terephthalate‐ p ‐oxybenzoate) (POB‐PET) copolyester, designated as P28 and P82, at the level of 10 wt %. The different p ‐acetoxybenzoic acid/PET mole ratios are 20/80 in P28 and 80/20 in P82. The blends were heated to 305°C and then cooled to 25°C at rate of 10°C/min. The crystalline morphology of these blends in the range from 25°C to 305°C is monitored by polarized light microscopy. Morphologic observations revealed a quicker appearance of crystalline in the blends upon the addition of 10 wt % copolyester as a nucleating agent. It is found that P28, which contains fewer POB units, is much more advantageous to the nucleation process than P82, which contains more POB units. According to the optical photomicrographs, sufficient uniformity of distribution of copolyester domains in the PET matrix is reached after 8 min blending. © 1996 John Wiley & Sons, Inc.