高性能热致淀粉基液晶聚合物。
High-performance thermotropic starch-based liquid crystalline polymer.
机构信息
Department of Polymer Engineering, The University of Akron, 250 South Forge Street, Akron, OH 44325-0301, USA.
School of Energy and Power Engineering, Changsha University of Technology and Science, Changsha 410076, China.
出版信息
Carbohydr Polym. 2012 Sep 1;90(1):703-8. doi: 10.1016/j.carbpol.2012.05.100. Epub 2012 Jun 6.
A thermotropic starch liquid crystalline polymer (St-10CN) was successfully synthesized by high-degree substitution (esterification) of the hydroxyl groups resided on the starch with mesogenic 11-(4'-cyano-biphenyl-4-yloxy)-undecanoic chloride in the presence of pyridine. The degree of substitution of St-10CN was calculated to be 2.68 based on the result of elemental analysis. The chemical structure of the polymer was confirmed using Fourier transfer infrared (FTIR) spectroscopy and nuclear magnetic resonance spectroscopy. The thermal transitions of St-10CN were determined using differential scanning calorimetry and its mesophase structures were characterized using polarized optical microscopy (POM) and wide-angle X-ray diffraction (WAXD). This unique starch-based side-chain liquid crystalline polymer is glassy and smectic with excellent thermal stability, and has tensile strength of 37.9±7.0 MPa and Young's modulus of 1.42±0.14 GPa.
成功地在吡啶存在下，用介晶 11-(4'-氰基联苯-4-基氧基)-十一烷酰氯对淀粉上的羟基进行高取代（酯化），合成了热致淀粉液晶聚合物（St-10CN）。根据元素分析的结果，计算出 St-10CN 的取代度为 2.68。利用傅里叶变换红外（FTIR）光谱和核磁共振光谱对聚合物的化学结构进行了确认。采用差示扫描量热法测定了 St-10CN 的热转变，利用偏光显微镜（POM）和广角 X 射线衍射（WAXD）对其介晶结构进行了表征。这种独特的基于淀粉的侧链液晶聚合物具有良好的热稳定性，为玻璃态和近晶相，拉伸强度为 37.9±7.0 MPa，杨氏模量为 1.42±0.14 GPa。
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