醋酸纤维素/聚碳酸亚丙酯复合膜的制备与性能

Preparation and Characterization of Cellulose Acetate/Polypropylene Carbonate Complex Films

通过溶液共混法制备了醋酸纤维素(CA)/聚碳酸亚丙酯(PPC)复合膜,研究了其透光性、力学性能、热稳定性和降解性能。结果表明:CA的加入会导致复合膜透明性降低,但因CA与PPC具有较好的相容性,其力学性能、热稳定性、亲水性和自然降解能力显著提高。当添加15%CA时,复合膜的拉伸强度最大,为24. 2 MPa,与纯PPC相比,提高了137%。同时,复合膜保持良好的韧性和延展性,其断裂伸长率可达624%。随着CA添加量的增加,复合膜热稳定性、亲水性和降解性大幅提高。当添加30%CA时,复合膜热失重温度T5%和Tmax分别为261. 6和290. 2℃,比纯PPC提高了约40℃;与水的接触角为71. 7°,比纯PPC降低了22. 2°;降解90 d后,复合膜的质量保持率仅为36. 3%。

The complex films of cellulose acetate （CA） and polypropylene carbonate （PPC） were prepared by solution blending, and the properties of light transmission, mechanical property, thermal stability and degradation were studied. Results indicated that the light transmission of the CA/PPC complex film decreased with the addition of CA, while the mechanical property, thermal stability, hydrophilic property and the ability of natural degradation obviously increased because of their partial compatibility of CA and PPC. When adding 15% CA, the maximum tensile strength of the complex films was achieved. The tensile strength was 24. 2 MPa, improved by 137% as compared to pure PPC. Furthermore, the complex film maintained a good ductility because of its high elongation at break of 624%. With increasing CA content, the thermal stability, hydrophilic property and degradation were substantially improved. When adding 30% CA, the T5% and Tmax were 261 ℃ and 290. 2 ℃ respectively, which was about 40 ℃ higher than that of pure PPC. In addition, the contact angle of the film was reduced by 22.2° , only 71.7°; the retention of film weight was only 36. 3% after 90 days of degradation.