微米级碳酸钙对乙丙无规共聚聚丙烯性能的影响

考察了微米级碳酸钙对乙丙无规共聚聚丙烯物理性能、结晶性能及熔融性能的影响。结果表明:当乙丙无规共聚PP中分别添加质量分数为1%，2%的微米级碳酸钙时，其熔体流动速率、弯曲性能、维卡软化温度变化较小，冲击强度下降，拉伸性能明显提高，结晶度和晶型影响很小；当碳酸钙添加质量分数为2%时，其结晶峰温度由108.3 ℃升至111.9 ℃，结晶起始温度由112.7 ℃升至118.2 ℃，熔融焓由87.8 J/g降至78.3 J/g。

Effect of micron-sized calcium carbonate on properties of ethylene-propylene random copolymer polypropylene

The effects of micron-sized calcium carbonate on physical properties， crystallization and melting properties of ethylene-propylene random copolymer polypropylene were investigated. The results showed that the melt flow rate， flexural properties and Vicat softening temperature of the ethylene-propylene random copolymer polypropylene had little change； the impact strength had decreased and the tensile properties had increased significantly； the crystallinity and crystal form had insignificant change when the mass fraction of micron-sized calcium carbonate was 1% and 2%.When the mass fraction of calcium carbonate was 2%， the peak temperature of crystallization had increased from 108.3 ℃ to 111.9 ℃， the crystallization onset temperature had increased from 112.7 ℃ to 118.2 ℃， and the melting enthalpy had decreased from 87.8 J/g to 78.3 J/g.