Stereocomplex poly(lactic acid) nanoparticles crystallized through nanoporous membranes and application as nucleating agent
Stereocomplex poly(lactic acid) nanoparticles crystallized through nanoporous membranes and application as nucleating agent
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DOI：
10.1039/c5ra25688g
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发表时间：
2016-02
期刊：
影响因子：
3.9
通讯作者：
H. Uehara;Mina Ishizuka;Hidekazu Tanaka;Makiko Kano;T. Yamanobe
中科院分区：
文献类型：
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作者：
H. Uehara;Mina Ishizuka;Hidekazu Tanaka;Makiko Kano;T. Yamanobe
聚（L-乳酸）（PLLA）和聚（D-乳酸）（PDLA）的立体络合物结晶是通过使它们的混合溶液流过多孔膜的纳米通道来进行的。纳米通道内的间距限制导致 PLLA 和 PDLA 链之间的接触。通过差示扫描量热法和X射线测量证实了所得材料的立体络合物晶体结构。扫描电镜形态观察表明，直径与通道宽度相对应的特征纳米颗粒相互聚集。当这种纳米粒子与纯PLLA混合时，起到基质结晶成核剂的作用。该共混物熔体冷却时的非等温结晶温度高于纯 PLLA 基质。相应地，该共混物的等温结晶所需的时间也较短。
Stereocomplex crystallization of poly(L-lactic acid) (PLLA) and poly(D-lactic acid) (PDLA) was performed by flowing their blended solution through nano-channels of porous membranes. The spacing restriction within the nano-channels induces contact between the PLLA and PDLA chains. The stereocomplex crystalline structure of the obtained material was confirmed by differential scanning calorimetry and X-ray measurements. Morphological observation by scanning-electron microscopy indicated that the characteristic nano-particles with a diameter corresponding to the channel width aggregate with each other. Such nano-particles play the role of nucleating agent for matrix crystallization when they are blended with pure PLLA. The non-isothermal crystallization temperature on cooling from the melt of this blend is higher than that of pure PLLA matrix. Correspondingly, the shorter time is required for the isothermal crystallization of this blend.