Мақола

Interfacial effects produced by crystallization of polypropylene with polypropylene‐<i>g</i>‐maleic anhydride compatibilitzers

J.J. DuvallDepartment of Macromolecular Science and Center of Applied Polymer Science, Case Western Reserve University, Cleveland, Ohio 44106C. SellittiDepartment of Macromolecular Science and Center of Applied Polymer Science, Case Western Reserve University, Cleveland, Ohio 44106Charles L. MyersA. HiltnerDepartment of Macromolecular Science and Center of Applied Polymer Science, Case Western Reserve University, Cleveland, Ohio 44106E. BaerDepartment of Macromolecular Science and Center of Applied Polymer Science, Case Western Reserve University, Cleveland, Ohio 44106

1994en

ABI

Аннотация

Abstract Two anydride‐grafted isotactic polypropylene (PP) compatibilizers, HAC or high‐anydride compatibilizer (2.7 wt % grafted maleic anhydride) and LAC or low‐anydride compatibilizer (0.2 wt % anydride), were compared in PP‐rich blends with polyamide‐66 (25 wt %). A previous article demonstrated that LAC imparted a much higher fracture strain than did HAC at similar anydride concentrations. The present study shows that LAC is capable of cocrystallization with PP. HAC does not cocrystallize, but crystallizes as a second phase in binary PP/HAC blends studied by DSC and hot‐stage microscopy. A cocrystallization model is proposed to explain the higher fracture strain of PP/LAC/PA blends. A. separate phase crystallization model is proposed for PP/HAC/PA blends. The models are supported by peel tests, which demonstrate greater adhesion of PP with LAC than with HAC. © 1994 John Wiley & Sons, Inc.

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DOI: 10.1002/app.1994.070520208

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