废胶粉/聚丙烯接枝物共混材料的制备与性能

采用熔融接枝法分别制备了高强度和高熔体流动速率的聚丙烯接枝马来酸酐共聚物,以改善聚丙烯与胶粉间的界面相容性,提高废胶粉/聚丙烯接枝物共混材料的力学性能和流动性.力学性能测试结果表明,随着废胶粉用量的增加,废胶粉/聚丙烯接枝物共混材料的拉伸性能下降,扯断伸长率和缺口冲击强度均增大,熔体流动速率减小,流动性变差.由热重分析...

Preparation and properties of waste rubber powder/polypropylene grafting material blends

Polypropylene grafted maleic anhydride copolymers with high strength and high melt flow rate were prepared by melt grafting method to improve the interfacial compatibility between polypropylene and waste rubber powder, and improve the mechanical properties and fluidity of waste rubber powder/polypropylene grafted copolymer blends. The results showed that with increase of the amount of waste rubber powder, the tensile properties of waste rubber powder/polypropylene grafted copolymer blends decreased, elongation at break and notched impact strength increased, melt flow rate decreased and fluidity became worse. Thermogravimetric analysis characterized that thermal stability of the blends increased and degradation rate decreased with increasing waste rubber powder amount. Rheological property test showed that when waste rubber powder amount was constant, with increase of the angular frequency, complex viscosity of the blends decreased, and loss modulus and storage modulus tended to increase. When the angular frequency was constant, the complex viscosity, storage modulus and loss modulus of the blends increased with increase of waste rubber powder amount. It could be seen from the section morphology of the blends that the more amount of waste rubber powder, the better compatibility of the blends. The tensile strength was more than 8.35 MPa, maximum elongation at break was 81%, melt flow rate was more than 2.74 g/10 min, and the maximum notched impact strength reached 15.6 kJ/m2.