Enhanced Crystallization from the Glassy State of Poly(L-lactic acid) Confined in Anodic Alumina Oxide Nanopores
Enhanced Crystallization from the Glassy State of Poly(L-lactic acid) Confined in Anodic Alumina Oxide Nanopores
复制标题
阳极氧化铝纳米孔中限制的聚（L-乳酸）玻璃态的增强结晶
DOI：
10.1021/acs.macromol.5b00108
复制
发表时间：
2015-04-28
期刊：
影响因子：
5.5
通讯作者：
Wang, Dujin
中科院分区：
文献类型：
--
作者：
Guan, Yu;Liu, Guoming;Wang, Dujin
采用差示扫描量热法（DSC）和广角X射线衍射法（WAXD）研究了聚L-乳酸（PLLA）在阳极氧化铝模板（AAO）中的结晶行为。在从玻璃态加热期间，与本体PLLA相比，渗透的PLLA的结晶出乎意料地增强。渗透态PLLA的冷结晶温度远低于本体PLLA。在75 ° C下渗透的PLLA的半结晶时间（t（1/2））随着AAO纳米孔的直径而减小。PLLA的玻璃化转变温度不受几何约束的影响，从玻璃态结晶的增强是由表面诱导成核的AAO壁PLLA解释。我们的研究结果提供了第一个观察到的增强冷结晶的聚合物在有限的几何形状，
The crystallization behavior of poly(L-lactic acid) (PLLA) it in anodic alumina oxide templates (AAO),was investigated by differential scanning calorimetry (DSC), and wide-angle-X-ray diffraction (WAXD). During heating from the glassy state, the crystallization, of infiltrated PLLA was unexpectedly enhanced as compared with bulk PLLA. The cold crystallization temperature of infiltrated PLLA from the glassy state was much lower than that of bulk PLLA. The half-crystallization time (t(1/2)) of infiltrated PLLA at 75 degrees C decreased with the diameter of AAO nanopores. The glass transition temperature of PLLA was not influenced by the geometrical Confinement, The enhanced crystallization from the glassy state was explained by surface-induced nucleation of AAO walls on PLLA. Our results provide the first observation of enhanced cold crystallization of polymers in confined geometry,