Poly(ethylene terephthalate)/polypropylene reactive blends through isocyanate functional group

Abstract

ABSTRACT:To evaluate the compatibilization effects of an isocyanate group on poly-(ethylene terephthalate)/polypropylene (PET/PP) blends through a reactive blend, PP grafted with 2-hydroxyethyl methacrylate-isophorone diisocyanate (PP-g-HI) was prepared and blended with PET. In view of the blend morphology, the presence of PP-g-HI reduced the particle size of the dispersed phase by the reduced interfacial tension between the PP and PET phases, indicating the in situ copolymer (PP-g-PET) generated during the melt blending. The DSC thermograms for the cooling run indicated that the PET crystallization in the PP-g-HI rich phase was affected by the chemical reactions of PET and PP-g-HI. The improved mechanical properties for the PET/PP-g-HI blends were shown in the measurement of the tensile and flexural properties. In addition, the water absorption test indicated that the PET/PP-g-HI blend was more effective than the PET/PP blend in improving the water resistance of PET. The positive properties of PET/PP-g-HI blends stemmed from the improved compatibilization of the PET/PP blend.

An investigation on the role of GMA grafting degree on the efficiency of PET/PP-g-GMA reactive blending: morphology and mechanical properties

“…Among reactive monomers grafted onto polyolefin backbone are maleic anhydride (MAH) [20,21], glycidyl methacrylate (GMA) [22][23][24], oxazolines, and isocyanates [25]. Previous studies elucidated that bifunctional GMA monomer shows more tendency towards PP chains with respect to MAH because of unsaturated groups in GMA, meanwhile an epoxy ring capable of being opened with hydroxyl, carbonyl, and amine functional groups [26,27].…”

Compatibilization of polypropylene/recycled polyethylene terephthalate blends with maleic anhydride grafted polypropylene in the presence of diallyl phthalate

“…Appropriate compatibilization is necessary to reduce the interfacial tension, achieve good adhesion, and stabilize the domain structure. There are multiple types of compatibilizers applied in PP/PET blends [2,4,7,9,[14][15][16][17][18][19][20][21][22][23][24][25][26][27]. PP grafted with maleic anhydride (PP-g-MAH) is the most common because of its improved polarity and reactivity [14,[24][25][26][27].…”

Study of PET/PP/TiO2 microfibrillar‐structured composites, part 1: Preparation, morphology, and dynamic mechanical analysis of fibrillized blends

“…In the second cooling run, the crystallization peak of the PET disappears upon addition of compatibilizer. A similar result was also found by Bae for PET/PP‐ g ‐HI blend 30. It was suggested that the in situ generated PP‐ g ‐PET copolymer that locates in the PET phase may act as a polymeric diluent to retard the crystallization of the PET and level off the heat of crystallization of the PET.…”