基于辐照聚合的聚丙烯腈性能研究

Research on property of PAN by irradiation polymerization

采用^(60)Co伽马射线辐照聚合丙烯腈的方法得到高相对分子质量聚丙烯腈(PAN)聚合物,通过傅里叶变换红外光谱仪、X射线衍射仪、热重分析仪、差示扫描量热仪和万能试验机对辐照时间不同的PAN聚合物的晶体结构、化学结构、热性能以及拉伸性能进行了分析和测试。结果表明:不同辐照时间聚合的3种PAN化学结构无明显差异,而粘均分子量有区别,辐照80min制备的PAN粘均分子量最大,为27×10^(4);辐照100min时PAN的结晶度最高,为39.15%,同时热稳定性较好,断裂伸长率最大,为25.24%;随着辐照时间的延长,PAN的结晶度、拉伸强度降低,热稳定性则变化不明显。

The method of polymerizing acrylonitrile by gamma ray irradiation was used to obtain polyacrylonitrile(PAN)polymer with high molecular weight.The crystal structures,chemical structure,thermal properties and tensile properties of PAN polymers with different irradiation time were analyzed,and tested by Fourier transform infrared spectrometer,X-ray diffractometer,thermogravimetric analyzer,differential scanning calorimeter and universal testing machine.The results indicated that there was no obvious difference on the chemical structure of three PAN powders of different irradiation time,but there was significant differences on the molecular weight and crystallinity of three PAN powders.The molecular weight of PAN obtained by irradiation for 80 minutes was the largest,which was 27×10^(4).However,the crystallinity of PAN obtained by irradiation for 100minutes was the highest,which is 39.15%,and the thermal stability was better,and the elongation at break of 25.24%was the highest.When the irradiation time increased,the crystallinity and tensile strength of PAN decreased,but the thermal stability did not change obviously.