论文部分内容阅读
在303~393 K的温度范围内,利用变温傅里叶变换衰减全反射红外光谱(ATR-FTIR),分别研究了聚氯乙烯亚甲基弯曲振动模式δ_(CH_2)的一维红外光谱、二阶导数红外光谱、四阶导数红外光谱、去卷积红外光谱和二维红外光谱。结果表明:当温度低于玻璃化转变温度时,聚氯乙烯分别在1420、1425、1430、1435和1447 cm~(-1)处出现红外吸收峰,随着温度的升高,聚氯乙烯δCH_2红外吸收强度的变化快慢顺序为1447 cm~(-1)>1420 cm~(-1)>1430cm~(-1)>1425 cm~(-1)>1435 cm~(-1);当温度超过玻璃化转变温度后,聚氯乙烯在1420、1425、1430和1435 cm~(-1)处出现红外吸收峰,而随着温度的升高,聚氯乙烯δCH_2红外吸收强度的变化快慢顺序为1425 cm~(-1)>1420 cm~(-1)>1430 cm~(-1)>1435 cm~(-1)。此项研究拓展了ATR-FTIR技术在聚氯乙烯热变性方面的应用范围。
In the temperature range of 303 ~ 393 K, the one-dimensional Fourier transform infrared spectroscopy (ATR-FTIR) was used to investigate the flexural vibration mode δ_ (CH_2) of poly (vinyl chloride) Derivative Infrared Spectroscopy, Fourth Derivative Infrared Spectroscopy, Deconvolution Infrared Spectroscopy, and Two-Dimensional Infrared Spectroscopy. The results show that when the temperature is lower than the glass transition temperature, the infrared absorption peaks appear at 1420, 1425, 1430, 1435 and 1447 cm -1, respectively. With the increase of temperature, The order of the change of infrared absorption intensity was 1447 cm -1> 1420 cm -1> 1430 cm -1> 1425 cm -1> 1435 cm -1. When the temperature exceeded After the glass transition temperature, the infrared absorption peak appears at 1420, 1425, 1430 and 1435 cm -1, while the change of infrared absorption intensity of the polyvinyl chloride (δCH_2) with the increase of temperature is 1425 cm ~ (-1)> 1420 cm ~ (-1)> 1430 cm ~ (-1)> 1435 cm ~ (-1). This study extends the range of applications of ATR-FTIR technology in the thermal denaturation of PVC.