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FENG Zhiliu, DONG Lisong, ZHANG Bolan, FANG Zheng, YANG Yongkuan. INVESTIGATION OF PP-EPR DIBLOCK COPOLYMER AS COMPATIBILIZER FOR PP/EPT BLEND*[J]. Chinese Journal of Polymer Science,
;1985, 3(3): 216-225.
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Blending isotactic polypropylene (PP) with ethylene-propylene terpolymer (EPT) is one of thesimplest and most effective ways for toughening PP. In order to further improve the toughness ofPP/EPT blend and to enhance the stability of the dispersed rubber phase, a diblock copolymer com-posed of PP and ethylene-propylene rubber blocks (PP-EPR) was added into the blend, as it is con-sidered that "forced compatibility" of the two components will be effected through the two chemi-cally bonded blocks, while two-phase structure still remains.Experimental results indicate that PP-EPR is an effective compatibilizer for PP/EPT blend.It not only increases the toughness of the blend,but also decreases the loss of tensile strengths usually accompanying the toughening of plastics with an elastomer,which is very well explained by the mor-phological structure changes when an appropriate amount of PP-EPR was added into the blend.
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