Rrsearch Of Phase Morphology And Properties In Immiscible-polymer Blend

Nowadays, much attention has been paid to ploymer blends with a co-continuousstructure, since most of polymer is immiscible on thermodynamics with “sea-island”phase morphology. As phase structure is transformed from “sea-island” toco-continuous structure, it is possible to improve its properties such as heat-resistance,corrosion resistance, flame-retartdant, anti-aging and so on. It provides a newapproach to promot properties of immiscible blends. The co-continuous morpholygiesare mainly formed closed to phase inversion point. Thus, OMMT was used as filler toreduce phase inversion point in this work.First, a melting blending method was used to prepare acrylonitrile-butadiene-styrene (ABS)/polyamide6(PA6) blends with OMMT filler. The effect of OMMTdispersion on the morphology evolution of ABS/PA6blends was studied by SEM,XRD and TEM. It was found that OMMT network were preferential dispersion in thePA6phase. The addition of OMMT leads to a phase transition from a sea-islandstructure to a co-continuous one. With an increase in OMMT loading (ΦOMMT), thePA6content (ΦPA6) required for the formation of the co-continuous structuredecreases, and a smaller domain size is observed. The results verified that there existsa quantitative relation between ΦOMMTand ΦPA6.The eigenvalue of ΦPA6and ΦOMMT,n, remains approximately8for this given system. It can offer useful reference tomolding the least OMMT loading required on PA6content during co-continuousstructure formated.Second, the influence of dispersion on phrase structure evolution of of blends wasstudies by dynamic rheological method. it could be considered as a critical content forformation of OMMT stereo network when it appeared modulus plateau in low freqregion. Addtion of PA6is a very effective method to reduce the critical content ofOMMT. The strorage modulus had no significant increase with content rising, while it is more difficult to processing since complex visicosity of blends rised sharply. Theformation of OMMT network can effciently improved as barrier character to theevolution of fammable volatiles and the ingress of oxygen to the condensed phase.Therefore, fame retardancy of the nanocomposites is signifcantly improved. Thecooperation effect of flame retardancy in blends was driven by additive of PA6.Furthermore, we studied the influence on interfacial interaction between GF andABS/PA6during the process of GF-PA6network formed. The work of adhesionbetween GF and polymer was caluculated based on the data of the contact angle andinterfacial shear strength, which was used to estimate the interfacial interaction. Theresult shows preferential aggregation of PA6on surface of GF was attributed tointerfacial relationship. PA6was considered as binder beneficial for building aGF-PA6network in polymer matrix during annealing. While GF-PA6network wasdestoried by orientation of GF along the direction of molding field. It is a key problemto find a blance of two opposite effects on GF-PA6network during annealingprocedure.