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Special effect of epoxy resin E‐44 on compatibility and mechanical properties of poly(butylene terephthalate)/polyamide‐6 blends
Author(s) -
An Jun,
Ge Jinying,
Liu Youxi
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(19960613)60:11<1803::aid-app3>3.0.co;2-p
Subject(s) - epoxy , izod impact strength test , materials science , composite material , scanning electron microscope , polyamide , flexural strength , dynamic mechanical analysis , crystallinity , crystallization , gelcoat , ultimate tensile strength , polymer , chemical engineering , engineering
An attempt was made to modify the properties of poly(butylene terephthalate) (PBT) by blending it with polyamide‐6 (PA‐6). Since PBT and PA‐6 are incompatible, epoxy resin was used as a compatibilizer to form an alloy. Alloys of PBT and PA‐6 with varying amounts (0–12%) of epoxy resin E‐44 were prepared by melt blending. The notched Izod impact strength and flexural strength as a function of epoxy resin E‐44 content were studied. Ultimate mechanical properties showed significant improvement on addition of epoxy resin E‐44. The maximum increase of the notched Izod impact strength (≈600%) of PBT/PA‐6 blends is obtained at 3% (weight) epoxy resin E‐44 content. The impact fracture surfaces were studied using scanning electron microscopy (SEM): The SEM micrographs showed a noticeable change in the type of surface structure on adding epoxy resin E‐44. DMTA also showed improved compatibility between PBT and PA‐6 on adding epoxy resin E‐44. DSC studies showed that the presence of epoxy resin E‐44 hindered the crystallization of both PBT and PA‐6 in the alloys. Wide‐angle X‐ray diffraction (WAXD) showed no obvious difference on crystallinity of PBT and PA‐6 in the alloys with the presence of a small amount of epoxy resin E‐44. © 1996 John Wiley & Sons, Inc.