College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, No. 16 Xuelin Road, Hangzhou 310036, China.
Carbohydr Polym. 2013 Feb 15;92(2):1921-7. doi: 10.1016/j.carbpol.2012.11.058. Epub 2012 Nov 28.
The eco-friendly poly(propylene carbonate) (PPC)/cellulose acetate butyrate (CAB) blends were prepared by melt-blending in a batch mixer for the first time. PPC and CAB were partially miscible because of the drastically shifted glass transition temperatures of both PPC and CAB, which originated from the specific interactions between carbonyl groups and hydroxyl groups. The incorporation of CAB into PPC matrix enhanced not only tensile strength and modulus of PPC dramatically, but also improved heat resistance and thermal stability of PPC significantly. The tensile strength and the modulus of PPC/CAB=50/50 blend are 27.7 MPa and 1.24 GPa, which are 21 times and 28 times higher than those of the unmodified PPC, respectively. Moreover, the elongation at break of PPC/CAB=50/50 blend is as high as 117%. In addition, the obtained blends exhibited good transparency, which is very important for the package materials. The results in this work pave new possibility for the massive application of eco-friendly polymer materials.
采用间歇式混炼机熔融共混的方法首次制备了环保型聚碳酸丙烯酯（PPC）/醋酸丁酸纤维素（CAB）共混物。PPC 和 CAB 部分相容，这是由于 PPC 和 CAB 的玻璃化转变温度大幅偏移所致，这源于羰基和羟基之间的特殊相互作用。CAB 的加入不仅显著提高了 PPC 的拉伸强度和模量，而且显著提高了 PPC 的耐热性和热稳定性。PPC/CAB=50/50 共混物的拉伸强度和模量分别为 27.7 MPa 和 1.24 GPa，分别是未改性 PPC 的 21 倍和 28 倍。此外，PPC/CAB=50/50 共混物的断裂伸长率高达 117%。此外，所得到的共混物表现出良好的透明度，这对于包装材料非常重要。这项工作的结果为环保聚合物材料的大规模应用开辟了新的可能性。
