Abstract: In this paper, maleic anhydride (MAH) was used as active agents for the end-capping of poly（propylene carbonate）（PPC）. The PPC/organic layered double hydroxide （OLDH） composites was prepared by melt blending. Compared with the pure PPC , When the content of OLDH in the composites is up to 4 %, the 5 % weight loss temperature, the 95 % weight loss temperature and the maximum rate of weight loss temperature was increased by 49.1、70.2、49.3 ℃, respectively. And the glass transition temperature（Tg）was increased from 18.3 ℃ to 22.7 ℃. The addition of a small amount of OLDH particle can both improve the mechanical properties of polymers and barrier properties.

Key words: poly（propylene carbonate）, layered double hydroxide, heat stability, mechanical property, barrier property