Effect of Bamboo Flour Grafted Lactide on the Interfacial Compatibility of Polylactic Acid/Bamboo Flour Composites

Xin-Yu Song; Meng Wang; Yun-Xuan Weng; Zhi-Gang Huang

doi:10.3390/polym9080323

Effect of Bamboo Flour Grafted Lactide on the Interfacial Compatibility of Polylactic Acid/Bamboo Flour Composites

Polymers (Basel). 2017 Jul 30;9(8):323. doi: 10.3390/polym9080323.

Authors

Xin-Yu Song¹, Meng Wang², Yun-Xuan Weng^{3

4}, Zhi-Gang Huang^{5

6}

Affiliations

¹ School of Materials and Mechanical Engineering, Beijing Technology& Business University, Beijing 100048, China. Songxy722@163.com.
² School of Materials and Mechanical Engineering, Beijing Technology& Business University, Beijing 100048, China. dywewm@163.com.
³ School of Materials and Mechanical Engineering, Beijing Technology& Business University, Beijing 100048, China. wyxuan@th.btbu.edu.cn.
⁴ Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing 100048, China. wyxuan@th.btbu.edu.cn.
⁵ School of Materials and Mechanical Engineering, Beijing Technology& Business University, Beijing 100048, China. huangzg@btbu.edu.cn.
⁶ Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing 100048, China. huangzg@btbu.edu.cn.

Abstract

Bamboo flour (BF) was grafted onto lactide (LA) in the molten state using stannous octoate as a catalyst to form BF-g-LA. Then, polylactic acid (PLA) was blended with BF (PLA/BF, 85/15 wt %) to prepare PLA/BF/BF-g-LA composites using BF-g-LA as a compatibilizer. The grafting rate of BF was characterized using infrared testing and elemental analysis. To investigate the effect of BF-g-LA on the performance of PLA/BF/BF-g-LA composites, the phase morphology, thermal stability, and mechanical properties of the composites were characterized using scanning electron microscopy, thermogravimetric analysis, and universal material testing, respectively. The addition of BF-g-LA improved the interface compatibility between PLA and BF. When the BF-g-LA content was 2 phr, the tensile and impact strengths of PLA/BF/BF-g-LA composites were 55.3 MPa and 9.56 kJ/m2, representing 30% and 27% increases, respectively, relative to corresponding values for PLA/BF composites.

Keywords: bamboo flour; compatibility; graft; lactide; polylactic acid.