聚丙撑碳酸酯的辐射效应  

Effect of Radiation on Poly(propylene carbonate)

作　　者：邓鹏飏[1] 孙家珍[1] 

机构地区：[1]中国科学院长春应用化学研究所

出　　处：《应用化学》2007年第3期323-326,共4页Chinese Journal of Applied Chemistry

基　　金：长春市科技基金资助项目(05GG57)

摘　　要：研究了室温条件下聚丙撑碳酸酯（PPC）在钴-60和电子加速器辐照过程中的响应行为。结果表明,聚丙撑碳酸酯是一种辐射裂解型聚合物,其分子量随着辐射剂量的增加而减小。1mm厚PPC片材在室温和N2气保护条件下,其裂解G值为Gs,γ-ray=10.81;Gs,EB=4.9。不同的裂解G值表明,O2气在聚丙撑碳酸酯的辐射裂解过程中有重要影响。红外光谱研究表明,辐射后聚丙撑碳酸酯在3474cm^-1处的峰宽峰高增加,表明其裂解后端—OH基增加。由于裂解作用,辐射后聚丙撑碳酸酯的抗张强度和断裂伸长率均下降。在通常的辐射消毒剂量范围内（25-50kGy）,PPC的保留抗张强度大于23MPa,断裂伸长率大于4%,裂解后试样的力学性能依然能够满足实际应用需要,因此PPC可以经受辐射消毒。The radiation effect of poly （ propylene carbonate） （PPC） has been studied under Co-60 and EB irradiation at room temperature. The molecular mass of PPC decreased with the increase of radiation dose. This result shows that PPC is a typical radiation degradable polymer. The degree of chain-scission Gs was estimated as Gs,γ-ray = 10. 81 and Ga,EB =4. 9 for 1 mm PPC sheet under N2 at room temperature. Different Gs values might come from O2 effect in the radiation process. The degradation products were identified by IR spectra, the result shows that -OH group increased after radiation. With increasing absorb dose, the tensile strength and elongation at break decreased. However, as radiation sterilization dose is set in a range of 25 - 50 kGy, the remaining tensile strength of PPC is higher than 23 MPa, and elongation at break is longer than 4%. These results indicate that PPC can be safely sterilized by irradiation.

关 键 词：聚丙撑碳酸酯 辐射裂解 力学性能 

分 类 号：O644[理学—物理化学] O631[理学—化学]