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Studies on blends of polyethylene terephthalate with bisphenol‐a‐polycarbonate and polypropylene
Author(s) -
Halder R. S.,
Deopura B. L.,
Misra A.
Publication year - 1989
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760292406
Subject(s) - materials science , polypropylene , polycarbonate , polyethylene terephthalate , composite material , crystallinity , izod impact strength test , ultimate tensile strength , polymer blend , flexural strength , ternary operation , polyethylene , phase (matter) , polymer , copolymer , chemistry , organic chemistry , computer science , programming language
Moldability and mechanical properties of polyethylene terephthalate (PET) under normal molding conditions were found to improve significantly when it was blended with bisphenol‐A‐polycarbonate (PC) and polypropylene (PP) to form ternary polymer blend systems. DSC results of these blends revealed that the PET and PC components formed a miscible blend while PP being incompatible with them, formed a separate phase. PP was also found to form a sleeve around the PET‐PC miscible phase and, thereby, showed a skin‐core type of morphology. Variations of mechanical properties with varying amounts of PP was measured keeping the ratio of PET and PC constant. Tensile and flexural properties of the blends decrease with the amount of PP. Notched impact strength increases up to a certain level of PP and then decreases, while the unnotched values decrease gradually. The effect of annealing on the mechanical properties of these blends have been discussed on the basis of the increased crystallinity of some of the components.