Research on novel compatibilizer and evaluation of interfacial adhesiveness
Since polypropylene (PP) has no polar group in the molecule, its interfacial adhesiveness between resin and fiber decreases. Therefore, the compatibilizer is important. Maleic acid modified PP (MAPP) is known as a general compatibilizerfor PP.However, due to low crystalline of MAPP, it affects crystalline and mechanical properties of the matrix PP.ICC usediPP-PAA copolymer (Fig.1) in which polyacrylic acid (PAA) was introduced at both ends of isotactic polypropylene (iPP) as a novel compatibilizer.The iPP-PAA block copolymer retains the crystalline of iPP. The presence of an ionic group (PAA) in the block chain allows a wide range of bonds to functional groups on the fiber surface. Therefore, it is expected that interfacial adhesiveness will be improved without impairing the crystalline of the matrix PP.The microdroplet test is one of the evaluations of interfacial adhesiveness. This test is a method of measuringthe interfacial shear strength by molding a resin bead into a single fiber and pulling out the fiber from the resin bead (Fig.2).
