Preparation and Performances of High-Toughness Transparent Polypropylene
The crystallization behaviors,mechanical properties,low-temperature toughness,light transmittance,and haze of polypropylene(PP)with different grades(PPB-MT25-S,SM198,J-570S,RP346R,UT8012M)were investigated.Additionally,the influences of olefin block copolymers(OBC),styrene-ethylene/butylene-styrene block copolymer(SEBS),polyolefin elastomer(POE),and acrylic-based elastomer(PBE)on the properties of PP whose grade was PPB-MT25-S(PP-B)were examined.The results reveal that PP-B initiates to crystallize at 128℃,whose tensile strength and Izod notched impact strength(23℃)are respectively 23.9 MPa and 12.6 kJ/m2.Its Izod notched impact strength at-5℃is 3.94 kJ/m2,the light transmittance is higher than 80%,and the haze is 40.00%.PP-B exhibits excellent comprehensive performances.Utilizing PP-B as the matrix,various toughening agents(OBC,SEBS,POE,and PBE)were incorporated.Among them,the SEBS-toughened PP material(PP-B/SEBS)demonstrates a tensile strength of 24 MPa and an elongation at break of 257%.The Izod notched impact strength(23℃)of PP-B/SEBS is 16.4 kJ/m2,and its Izod notched impact strength(-5℃)is 2.53 kJ/m2.PP-B/SEBS exhibits excellent mechanical properties and low-temperature toughness.Furthermore,the rigidity-toughness balance factor of PP-B/SEBS is 1.76,indicating a high level of rigidity-toughness balance.PP-B/SEBS also exhibits a superior light-admitting quality with a light transmittance of 84.4%and a haze of 23.87%.
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