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首页> 外文期刊>RSC Advances >Effect of poly(vinyl alcohol) as an efficient crystallization-assisting agent on the enhanced crystallization rate of biodegradable poly(L-lactide)
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Effect of poly(vinyl alcohol) as an efficient crystallization-assisting agent on the enhanced crystallization rate of biodegradable poly(L-lactide)

机译：聚乙烯醇作为有效的结晶助剂对提高可生物降解聚丙交酯结晶速率的影响

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Fully biodegradable poly(L-lactide) (PLLA) and poly(vinyl alcohol) (PVA) blends were prepared through a solution and casting method at very low PVA contents of 0.5 and 1 wt%. The effect of PVA on the crystallization behaviors of PLLA was investigated in detail under different crystallization conditions. Both the nonisothermal melt and cold crystallization behaviors of PLLA have been significantly enhanced by PVA, as evidenced by the increase of the nonisothermal melt crystallization peak temperature and the decrease of the nonisothermal cold crystallization peak temperature, with respect to neat PLLA. The overall isothermal melt crystallization rates of PLLA in the PLLA/PVA blends are also obviously faster than that of neat PLLA at the same crystallization temperature; however, the crystallization mechanism remains unchanged for both neat and blended PLLA, regardless of crystallization temperature. The spherulitic morphology and growth rate study reveals that PVA not only obviously increases the nucleation density of PLLA spherulites but also increases the growth rates of PLLA spherulites in the PLLA/PVA blends to some extent, which both contribute to the enhanced overall isothermal crystallization rates of PLLA. Therefore, PVA is an efficient crystallization-assisting agent for the enhanced crystallization of PLLA, and it is probably the first biodegradable polymer to accelerate the crystallization of PLLA at a very low content by acting as both a nucleation-assisting agent and a spherulite growthassisting agent. Despite the presence of PVA, both neat PLLA and the PLLA/PVA blends present the same crystal structures. A possible nucleation mechanism of PVA on the crystallization of PLLA was also discussed.
机译：通过溶液和流延方法以0.5和1重量％的非常低的PVA含量制备了完全可生物降解的聚（L-丙交酯）（PLLA）和聚（乙烯醇）（PVA）共混物。在不同的结晶条件下，详细研究了PVA对PLLA结晶行为的影响。 PVA显着增强了PLLA的非等温熔体和冷结晶行为，这与纯PLLA的非等温熔体结晶峰温度的升高和非等温冷结晶峰温度的降低所证明。在相同的结晶温度下，PLLA / PVA共混物中PLLA的总等温熔融结晶速率也明显快于纯PLLA。但是，无论结晶温度如何，纯净PLLA和混合PLLA的结晶机理均保持不变。球晶的形貌和生长速率研究表明，PVA不仅明显增加了PLLA球晶的成核密度，而且在一定程度上提高了PLLA球晶的生长速率，这都有助于提高PLA球体的整体等温结晶速率。 PLLA。因此，PVA是增强PLLA结晶的有效结晶助剂，它可能是第一种通过同时充当成核助剂和球晶生长助剂而以极低的含量促进PLLA结晶的可生物降解的聚合物。 。尽管存在PVA，但纯PLLA和PLLA / PVA共混物均具有相同的晶体结构。还讨论了PVA对PLLA结晶的可能成核机理。

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