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中文摘要：
以偶偶尼龙-6 18为例，通过示差扫描量热分析（DSC）、广角X射线衍射（WAXD）与傅里叶变换红外光谱（FTOR）等方法研究了其Brill转变的过程，探索了脂肪族聚酰胺的晶型转变的本质．X射线衍射结果表明，随着温度的升高，尼龙-6 18由三斜晶系转变为假六方晶型，同时其DSC曲线上出现一个较宽的吸热峰．红外光谱结果表明，在其晶型转变过程中，晶体内氢键强度逐渐减弱，与酰胺键相连的C—C和C—N键发生扭曲．酰胺基团之间的亚甲基链段的振动逐渐增强，部分亚甲基单元由反式构象变成旁式构象，最后整齐排列的亚甲基链段逐渐变得无序化．
英文摘要：
The Brill transition of even-even nylon-6 18 was investigated by using differential scanning calorimetry（ DSC ）, temperature-dependent wide angle X-ray diffraction （WAXD） and Fourier transform infrared （FTIR）. The X-ray diffraction results indicate that the melt-crystallized sample of nylon-6 18 transforms from the triclinic unit cell to the pseudo-hexagonal phase in the temperature range of 120-180℃. In this range, the thermograph of nylon-6 18 presents a broad endothermal peak. From the FTIR spectra, it can be found that, during the transition process of nylon-6 18, the intensity of the intrasheet hydrogen bonds becomes weak. At the same time, the CH2-amide bonds twist and the all-tram conformation of methylene sequences is disordered by inserting the gauche conformation. The CH2 segments are in a mobile state because of the enhanced stretching and twisting vibrations of C-CO and C-N bonds.
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