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The changes of transesterification level in PET/PEN blends with the addition of PET–PEN copolymer
Author(s) -
Ida ShinIchiro,
Yamamoto Hiroko,
Ito Masayoshi
Publication year - 2009
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.29884
Subject(s) - copolymer , transesterification , materials science , polymer chemistry , ethylene , poly ethylene , chemical engineering , chemistry , composite material , catalysis , organic chemistry , polymer , engineering
Abstract The extent of transesterification in poly(ethylene terephthalate) (PET)/poly(ethylene‐2,6‐naphthalate) (PEN) blends with the addition of PET–PEN copolymers was examined by DSC and 1 H‐NMR measurements to evaluate the factor affecting the reaction level at a given temperature and time. Both block (P(ET‐ block ‐EN)) and random (P(ET‐ ran ‐EN)) copolymers were used as the copolymers. At a given treatment temperature and time, the level was increased by the addition of P(ET‐ block ‐EN) into PET/PEN blends. On the other hand, a reverse change was observed when P(ET‐ ran ‐EN) was mixed with PET/PEN blends. During the treatment, an inhomogeneous phase of the blends changed into the homogeneous one; however, the change showed little effect on the reaction level. The effects of molecular weight on the reaction level were also examined. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009