Research On The Preparation And Structural Behavior Of Nylon6/ABS Blend

Preparation of polymers blends is one of the important ways to achievehigh-performance polymer material. In this paper, Nylon6 and ABS are blended and then theblends are modified separately with ABS-g-MAH and SMA as the compatibilizer. Therelationships between the blend’s morphological structure and properties are studiedsystematically. Relatively deeper exploration and analysis to the high performance andtheoretical research are made, which lay theoretical foundation for the development andapplication of high-performance nylon blends. Besides the blends’structure and mechanicalproperties, behaviors of rheological, melt and crystallization are also studied. The main workis as follows:Study on the mechanical properties of Nylon6 and its blends:Blends’impact strength first increased and then decreased with increasing thecompatibilizer concentration. When the addition of ABS-g-MAH was 20% or the addition ofSMA was 1.5%, the maximum impact strength was obtained. Both the tensile strength andelogation at break first increased and then decreased. The tensile strength reached themaximum value as the addition of ABS-g-MAH was 5% or the addition of SMA was 1.5%.Study on the rheological properties of Nylon6 and its blends:It was found that the Nylon6 and its blends were all pseudoplastic fluid, which presented"shear thinning phenomenon". Non-newtonian index of Nylon6 blends decreased as theincreasing addition of compatibiliazer. The apparent visconsity of blends increased with thecontent of compatibilizer, under the same shearing rate. While the apparent visconsity showeda remarkble decrease when the content of ABS-g-MAH was over 30% or the content of SMAwas over 3%. As the increasing content of compatibilizer, the flow activation energy firstincreased and then decreased. The value of the flow activation energy was not big, whichmeant that the blends were not sensitive to the temperature. Study on the melting and crystallization behavior of Nylon6 and its blends:Research indicated that because of the compatibilizer, new crystal form was obtained andthe crystalline changed fromγ-Phase intoβ-Phase. ABS had little effect on the Nylon6’scrystal form. Furthermore, the sphaerocrystal structure of Nylon6 was damaged, which wascaused by the compatibilizer’s heterogeneous nucleation and the reaction between Nylon6 andthe compatibilizer, resulting in the change of Nylon6’s crystal habit. Besides, double meltingpeaks were observed in all the melting peaks of Nylon6 and its blends. The crystallizationkinetics of Nylon6 and its blends were studied in the classic crystallization kinetics theory. Itwas demonstrated by the results that the Avrami equation well described the isothermalcrystallization process of the composites. The Mo method was suitable for the non- isothermalcrystallization kinetics theory of the composites, rather than the Ozawa equation and theAvrami equation modified by Jeziorny. Based on the experiments, all the crystallizationkinetics parameters of the composites were obtained by fitting experimental spectrum data.