Crystal Orientation of Poly(l-Lactic Acid) Induced by Magnetic Alignment of a Nucleating Agent
Crystal Orientation of Poly(l-Lactic Acid) Induced by Magnetic Alignment of a Nucleating Agent
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DOI：
10.3390/polym10060653
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发表时间：
2018-06-01
期刊：
影响因子：
5
通讯作者：
Kawai, Takahiko
中科院分区：
文献类型：
--
作者：
Kusumi, Ryosuke;Teranishi, Sachi;Kawai, Takahiko
采用磁性定向成核剂苯基膦酸锌（PPAZn）控制聚乳酸（PLLA）晶体的取向生长。PPAZn微晶的一维磁取向微晶阵列揭示了PPAZn晶体中磁化强度与晶轴之间的关系。PPAZn微晶通过熔融混合均匀地分散在PLLA中，这由于降解而降低了PLLA组分的分子量。熔融PLLA中的PPAZn微晶在8-T静态或旋转磁场下单轴排列。广角X射线衍射和小角X射线散射谱分析表明，PLLA片层是从PPAZn微晶表面生长而成的，PPAZn微晶沿着易磁化轴或硬磁化轴单轴取向，PLLA的c轴平行于PPAZn的bc面。有人还建议，更大的成核效果PPAZn PLLA不是来自几何匹配，但从有利的相互作用和/或板状的微晶形状等因素。
The orientation of poly(l-lactic acid) (PLLA) crystals was controlled through crystal growth from a magnetically oriented nucleating agent, phenylphosphonic acid zinc (PPAZn). The one-dimensional magnetically oriented microcrystal array of PPAZn microcrystals revealed the relationship between the magnetization and crystallographic axes in the PPAZn crystal. The PPAZn microcrystals were homogeneously dispersed in PLLA via melt mixing, which decreased the molecular weight of the PLLA component due to degradation. The PPAZn microcrystals in the molten PLLA were uniaxially aligned under an 8-T static or rotating magnetic field. The wide-angle X-ray diffraction and small-angle X-ray scattering patterns of the PPAZn/PLLA composite films crystallized under each magnetic field showed that the PLLA lamellae grew from the surface of the PPAZn microcrystals, which were uniaxially oriented along the easy- or hard-magnetization axis, with the c-axis of PLLA parallel to the bc-plane of PPAZn. It was also suggested that the greater nucleating effect of PPAZn on PLLA was derived not from geometrical matching, but from factors such as favorable interactions and/or the plate-like shape of the microcrystal.