Preferential formation of stereocomplex in high-molecular-weight polylactic acid racemic blend induced by carbon nanotubes
Preferential formation of stereocomplex in high-molecular-weight polylactic acid racemic blend induced by carbon nanotubes
复制标题
碳纳米管诱导高分子量聚乳酸外消旋共混物优先形成立体络合物
DOI：
10.1016/j.polymer.2016.10.034
复制
发表时间：
2016-11
期刊：
影响因子：
4.6
通讯作者：
Li Zhong-Ming
中科院分区：
文献类型：
--
作者：
Yang Su;Zhong Gan-Ji;Xu Jia-Zhuang;Li Zhong-Ming
立构复合物（sc）结晶是赋予聚L-乳酸/聚D-乳酸（PLLA/PDLA）共混物上级耐热性的一个重要途径。然而，在高分子量（HMW）外消旋共混物中，sc的形成受到抑制。在这里，我们公开了一种简单但有效的方法，以促进通过在溶液浇铸过程中引入碳纳米管（CNT）的sc形成。广角X射线衍射和差示扫描量热分析结果表明，少量CNT的加入使PLLA/PDLA共混物绝大多数结晶为sc型，且均蒙脱土的相对含量显著降低。特别是，发现仅掺入0.2重量%的碳纳米管的独家形成的sc微晶。这可能是由于碳纳米管作为分子间连接的锚，引发了PLLA和PDLA之间的结晶。
Stereocomplex (sc) crystallization is appealing to endow the poly(l-lactic acid)/poly(d-lactic acid) (PLLA/PDLA) blends with superior heat resistance. However, sc formation is dampened in the high-molecular-weight (HMW) racemic blends. Here, we disclosed a simple but effective approach to facilitate sc formation by introducing carbon nanotubes (CNTs) during the solution casting. As revealed by wide-angle X-ray diffraction and differential scanning calorimetry, the HMW equimolar PLLA/PDLA blends were overwhelmingly crystallized into sc modification in presence of a small amount of CNT, and the relative content of homocrystallites was notably decreased. Especially, exclusive formation of sc crystallites was found with only incorporation of 0.2 wt% CNTs. Such an intriguing phenomenon was probably attributed to the fact that CNTs acted as the anchor to promote intermolecular nexus and triggered the headmost crystallization between PLLA and PDLA.
登录
查看更多内容
影响因子：
4.6
作者：
H. Urayama;T. Kanamori;K. Fukushima;Y. Kimura
通讯作者：
H. Urayama;T. Kanamori;K. Fukushima;Y. Kimura
影响因子：
7.015
作者：
Chen, Wei;Wang, Shijun;Miyoshi, Toshikazu
通讯作者：
Miyoshi, Toshikazu
影响因子：
5.5
作者：
Purnama, Purba;Kim, Soo Hyun
通讯作者：
Kim, Soo Hyun
通过同晶熔融重结晶在对映体聚丙交酯中形成立体络合物：结晶动力学和晶体形态
影响因子：
5.5
作者：
Na, Bing;Zhu, Jie;Chen, Bibo
通讯作者：
Chen, Bibo
影响因子：
5.5
作者：
Zhang, JM;Sato, H;Ozaki, Y
通讯作者：
Ozaki, Y