Investigation of Brill transition in nylon 6 and nylon 6,6 by infrared spectroscopy
Investigation of Brill transition in nylon 6 and nylon 6,6 by infrared spectroscopy
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DOI：
10.1021/ma980935o
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发表时间：
1998-10
期刊：
影响因子：
5.5
通讯作者：
N. Vasanthan;N. Murthy;R. Bray
中科院分区：
文献类型：
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作者：
N. Vasanthan;N. Murthy;R. Bray
结果N6，6在1100 - 800和1350 - 1100 cm-1频率范围内随温度变化的红外光谱分别如图1a、B所示。室温下的红外光谱显示出结晶和非晶组分的特征谱带。N6，6的谱带分配在文献中报道。7 1200和935 cm-1处的谱带与结晶相有关，而1180和1144 cm-1处的谱带与非晶相有关。当半结晶样品从室温加热到熔融温度（260 ℃）时，尖锐的结晶带（例如，1200和935 cm-1）变得更弱、更宽并在熔体中消失，而宽的非晶带（例如，1180和1144 cm-1）直到熔体基本保持不变。仔细检查的光谱表明，一些较弱的结晶带（例如，1329，1303，1224 1065，1042，1014，987，并可能906 cm-1）突然消失之间160和180 C远早于T m。在将膜加热至熔融和从熔融冷却（未示出）至室温期间获得的光谱的比较表明，这些变化是完全可逆的。我们称这些较弱的晶体带为布里尔带，因为它们在T B处消失。
Results. Infrared spectra taken as a function of temperature for N6, 6 in the frequency regions 1100− 800 and 1350− 1100 cm-1 are shown in Figure 1 a, b, respectively. Infrared spectra at room temperature show bands characteristic of crystalline and amorphous components. The band assignments for N6, 6 are reported in the literature. 7 The bands at 1200 and 935 cm-1 are associated with the crystalline phase, while the bands at 1180 and 1144 cm-1 are associated with the amorphous phase. When a semicrystalline sample is heated from room temperature to the melting temperature (260 C), the sharp crystalline bands (eg, 1200 and 935 cm-1) become weaker and broader and disappear in the melt, and the broad amorphous bands (eg, 1180 and 1144 cm-1) remain essentially unchanged up to the melt. Careful examination of the spectra shows that some of the weaker crystalline bands (eg, 1329, 1303, 1224 1065, 1042, 1014, 987, and possibly 906 cm-1) abruptly disappear between 160 and 180 C much before T m. Comparison of the spectra obtained during heating the film to the melt and cooling (not shown) from the melt to room temperature show that these changes are completely reversible. We will call these weaker crystalline bands Brill bands because they disappear at T B.