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利用差示扫描量热仪(DSC)研究了3种稀土成核剂[WBG-Ⅱ、WBG-Ⅱ(a)与WBG-Ⅱ(b)]对聚乳酸(PLA)的影响。非等温结晶动力学分析表明:添加成核剂后在相同的降温速率下结晶发生的温度区间比纯PLA高11~15℃,其中WBG-Ⅱ(b)在10℃/min的降温速率下可以将PLA的结晶温度由109.2℃提高到124.1℃,结晶诱导时间tinc由8.43 min减少到6.55 min,说明可以作为1种有效的PLA成核剂。
The effects of three rare earth nucleating agents [WBG-Ⅱ, WBG-Ⅱ (a) and WBG-Ⅱ (b)] on polylactic acid (PLA) were studied by differential scanning calorimetry (DSC) The results of non-isothermal crystallization kinetics showed that the crystallization temperature ranged from 11 to 15 ℃ higher than that of pure PLA at the same temperature drop rate after addition of nucleating agent, and WBG-Ⅱ (b) could be cooled at a cooling rate of 10 ℃ / min PLA crystallization temperature increased from 109.2 ℃ to 124.1 ℃, crystallization induction time tinc reduced from 8.43 min to 6.55 min, which can be used as a potent PLA nucleating agent.