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在1000~800cm-1频率范围内,分别采用一维红外光谱法、二阶导数红外光谱法和四阶导数红外光谱法测定了聚丙烯的结构。研究发现:809cm-1、841cm-1、900cm-1和998cm-1频率处的四个红外吸收峰均归属于等规聚丙烯晶体红外吸收谱带(δcrystalline)。进一步采用二维红外光谱法研究了温度对聚丙烯δcrystalline的影响。研究发现,随着测定温度的升高(30~120℃),聚丙烯分子中δcrystalline红外吸收强度变化快慢顺序为:998cm-1>841cm-1>900cm-1>809cm-1。此项研究显示出二维红外光谱技术在聚丙烯高分子材料热变性分析中的重大作用。
The structure of polypropylene was determined by one-dimensional infrared spectroscopy, second-order derivative infrared spectroscopy and fourth-order derivative infrared spectroscopy in the frequency range of 1000-800cm-1. It is found that the four infrared absorption peaks at the frequency of 809cm-1,841cm-1,900cm-1 and 998cm-1 belong to the isotactic polypropylene crystal infrared absorption band (δcrystalline). The influence of temperature on δcrystalline polypropylene was further studied by two-dimensional infrared spectroscopy. The results showed that the change of δc crystallized infrared absorption intensity of polypropylene was 998cm-1> 841cm-1> 900cm-1> 809cm-1 with the increase of measuring temperature (30-120 ℃). This study shows the important role of two-dimensional infrared spectroscopy in thermal denaturation analysis of polypropylene polymers.