Effect of triblock-copolymeric compatibilizing addidives on improving the mechanical properties of silica flour-filled polypropylene composites
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Central Metallurgical R&D Institute (CMRDI)
Publication date: 2008-01-01
Physicochem. Probl. Miner. Process. 2008;42(1):165–176
Minerals are introduced during the compounding processes into the polymeric host matrix in most thermoplastics industries to accomplish a variety of modified physical characteristics to the new-born composites. The introduction of well-dispersed silica flour particulates; tailored with respect to grade and fineness; into the virgin polypropylene matrix has shown an extreme improvement in the per- formance characteristics of the end-product. This could be attributed to the relatively low thermal ex- pansion coefficient of silica. In this study, purified silica flour was blended with polypropylene to produce the finished masterbatch formulation for plastics industry. The flour was added during com- pounding stage with different loading levels from 1.5% to 15% by volume. Results showed substan- tial improving in many physical properties, i.e., increase in Young’s modulus, impact strength, and yield stress measures. Moreover, silica addition resulted drop in all strain measures of the end prod- ucts with various loading levels. On the other-hand, the addition of styrene-ethylene/butylene-styrene block SEBS and its grafted maleic anhydride surface compatibilizers was extra added during the blend digestion process to enhance silica/ PP wettability. After the addition of SEBS compatible re- agent, results did not show improving in both Young’s modulus and yield strength measures. Yet, remarkable improvement in impact strength and strain characters was noticed.