Impact-modified nylon 6/polypropylene blends: 1. Morphology-property relationships
1995; Elsevier BV; Volume: 36; Issue: 24 Linguagem: Inglês
10.1016/0032-3861(95)96828-v
ISSN1873-2291
AutoresA. González‐Montiel, H. Keskkula, Donald R. Paul,
Tópico(s)Polymer Science and PVC
ResumoTwo types of elastomers grafted with maleic anhydride (MA), an ethylene—propylene random copolymer (EPR) and a styrene—ethylene/butylene—styrene triblock copolymer (SEBS) were found to function both as impact modifiers and compatibilizers for nylon 6/polypropylene blends. The maleic anhydride grafted to the rubber reacts with the amine end-groups of the polyamide, forming a rubber-nylon 6 graft copolymer that locates at the interface between nylon 6 and polypropylene (PP) and thus acts as a compatibilizer. The SEBS-g-MA material appears to be the most effective compatibilizer. The two rubbers were equally effective for increasing room temperature toughness by dispersing in the nylon 6 phase of the blends. Lower ductile-brittle transition temperatures are obtained when EPR-g-MA rubber is used, owing to its lower Tg and lower modulus at low temperatures compared to SEBS-g-MA rubber. Blend parameters such as rubber content, nylon 6/PP ratio and molecular weight of the components strongly influence the morphology and toughness of the blends. Low ductile—brittle transition temperatures were obtained for blends in which any combination of the above parameters yielded a morphology where nylon 6 was the matrix phase with polypropylene and rubber finely dispersed in it, provided the component molecular weights were high enough to provide adequate intrinsic ductility.
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