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Blends of poly(ethylene terephthalate) with co[poly(ethylene terephthalate‐ p ‐oxybenzoate)]. II. Composition effect on the rate of crystallization
Author(s) -
Ou ChengFang,
Lin ChenChong
Publication year - 1995
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/app.1995.070560910
Subject(s) - copolyester , crystallization , ethylene , materials science , polymer chemistry , poly ethylene , moiety , chemical engineering , composite material , organic chemistry , chemistry , polyester , engineering , catalysis
Abstract Poly(ethylene terephthalate) (PET) was blended with four different kinds of co[poly(ethylene terephthalate‐ p ‐oxybenzoate)] copolyesters, designated P28, P46, P64, and P82, with the level of copolyester varing from 1 to 15 wt %. All samples were prepared by melt‐mixing in a Brabender Plasticorder for 8 min. The crystallization behavior of samples were then studied via DSC. The results indicate that these four copolyesters accelerate the crystallization rate of PET in a manner similar to that of a nucleating agent. The acceleration of the PET crystallization rate was most pronounced in the PET/P28 blends with a maximum level at 10 wt % of P28, and in the PET/P28 blends, at 5 wt % of P82. The melting endotherm onset temperatures and the melting peak widths for the blends are comparable with those of neat PET. These results imply that the stability of PET crystalline phase in the blends does not change by blending. The observed changes in crystallization behavior, however, are explained by the effect of the physical state of the copolyester during PET crystallization as well as the content of the p ‐oxybenzoate (POB) moiety in corporated into the blends. © 1995 John Wiley & Sons, Inc.