The Effect of Rubber Type and Rubber Functionality on the Morphological and Mechanical Properties of Rubber-toughened Polyamide 6/Polypropylene Nanocomposites
ABSTRACT:
Rubber toughened polyamide 6/polypropylene (PA6/PP)nanocomposites containing 4wt% of organophilic modified montmorilonite (OMMT) were produced by melt compounding followed by injection moulding.
Four different types of elastomer were incorporated into the blends as a toughener, i.e., ethylene-octene elastomer (POE), ethylene-propylene elastomer (EPR), maleated POE (POEgMAH) and maleated EPR (EPRgMAH). The influences of maleating on the interfacial adhesion and mechanical properties of the nanocomposites were investigated in term of mechanical testing, the X-ray diffraction (XRD) and scanning electron microscope (SEM) observation.
The results showed that modulus and strength of the nanocomposites was not significantly affected by types of elastomer and their functionality. However, the toughness of the nanocomposites toughened by maleated elastomer was higher than the unmaleated elastomer. The SEM observation revealed that rubber functionality reduces the elastomer particle size in the PA6/PP matrix due to the in situ formation of graft copolymer between maleated elastomer and PA6 during melt processing.
XRD revealed that the type of elastomer and functionality did not affect the dispersion of the organoclay in the system.
Introduction:
Blending polyamide 6 (PA6) with polypropylene (PP) leads to materials with improved chemical and moisture resistance, dimension stability and reduced cost. However, to achieve these advantages, some form of compatibilization is generally required.1–5
Successful approaches involved the addition of PP grafted with maleic anhydride (PPgMAH) as a third component to the blend. It is well recognized that during melt mixing process, these functionalized polymers may become in situ grafted with PA6 in a reaction involving succinic anhydride groups on maleic anhydride with amine end-groups of PA6, giving rise to strong links between the two phases.1,2 However,
a low notched impact strength is a common feature of these blends. Thus considerable effort is being devoted to increase the impact toughness by adding an elastomer into the blends.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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