Wang Youyong, Song Yongming, Du Jun, Xi Zhenhao, Wang Qingwen
Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education), Northeast Forestry University, Harbin 150040, China.
State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
Materials (Basel). 2017 Aug 26;10(9):999. doi: 10.3390/ma10090999.
Polylactide (PLA)/wood flour composite foam were prepared through a batch foaming process. The effect of the chain extender on the crystallization behavior and dynamic rheological properties of the PLA/wood flour composites were investigated as well as the crystal structure and cell morphology of the composite foams. The incorporation of the chain extender enhanced the complex viscosity and storage modulus of PLA/wood flour composites, indicating the improved melt elasticity. The chain extender also led to a decreased crystallization rate and final crystallinity of PLA/wood flour composites. With an increasing chain extender content, a finer and more uniform cell structure was formed, and the expansion ratio of PLA/wood flour composite foams was much higher than without the chain extender. Compared to the unfoamed composites, the crystallinity of the foamed PLA/wood flour composites was improved and the crystal was loosely packed. However, the new crystalline form was not evident.
通过间歇发泡工艺制备了聚乳酸（PLA）/木粉复合泡沫材料。研究了扩链剂对PLA/木粉复合材料结晶行为和动态流变性能的影响，以及复合泡沫材料的晶体结构和泡孔形态。扩链剂的加入提高了PLA/木粉复合材料的复数黏度和储能模量，表明熔体弹性得到改善。扩链剂还导致PLA/木粉复合材料的结晶速率和最终结晶度降低。随着扩链剂含量的增加，形成了更细小、更均匀的泡孔结构，且PLA/木粉复合泡沫材料的膨胀比远高于未添加扩链剂时的情况。与未发泡的复合材料相比，发泡后的PLA/木粉复合材料的结晶度提高，晶体堆积松散。然而，新的晶型并不明显。
