Thermal Properties of α- and γ-Forms of Nylon 6
Thermal Properties of α- and γ-Forms of Nylon 6
复制标题
尼龙 6 α 型和 γ 型的热性能
DOI：
10.1143/jjap.14.206
复制
发表时间：
1975
影响因子：
1.5
通讯作者：
K. Asai
中科院分区：
文献类型：
--
作者：
T. Itoh;H. Miyaji;K. Asai
用高温X射线照相机（HTXC）和差示扫描量热仪（DSC）分析了尼龙6的多重熔融行为。在结晶和非晶之间的中间相熔融被认为有助于在DSC中的较高的温度峰。确认了α型试样的再结晶过程。在两相模型的基础上，自洽地分别确定了α-和γ-形式的下列化学量：熔化热，41和33 cal/g，表面自由能，57和47 erg/cm 2，平衡熔化温度，272和272°C。发现在低于熔化温度的整个区域内，α-晶型比γ-晶型更稳定。
Multiple melting behavior in nylon 6 is analyzed by means of a high temperature X-ray camera (HTXC) and a differential scanning calorimeter (DSC). Melting in the intermediate phase between crystalline and amorphous ones is supposed to contribute to the higher temperature peak in DSC. The recrystallization process is confirmed for the α-form specimen. On the basis of the two-phase model, the following thermodynamical quantities are self-consistently determined for the α- and γ-forms respectively; heat of fusion, 41 and 33 cal/g, surface free energy, 57 and 47 erg/cm2 and equilibrium melting temperature, 272 and 272°C. The α-form is found to be more stable than the γ-form in the whole region below the melting temperature.