Specific characteristics of infrared spectra of irradiated γ‐polypropylene
Specific characteristics of infrared spectra of irradiated γ‐polypropylene
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辐照γ-聚丙烯红外光谱的具体特征
DOI：
10.1002/(sici)1097-4628(19960103)59:1
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发表时间：
1996
影响因子：
3
通讯作者：
D. Gavrilă
中科院分区：
文献类型：
--
作者：
D. Gavrilă
通过傅里叶变换红外（FTIR）分析，已确定了全同立构聚丙烯中通过γ辐照产生的非挥发性产物。在空气中进行γ辐照，剂量在20和1200 k戈伊之间变化，剂量率为800戈伊/h。测定了辐照样品横截面不同区域羰基红外吸收带的轮廓线。羰基由酯或酮、羧酸和γ-内酯的浓度产生，但其结构因剂量不同而不同。我们还研究了辐照聚丙烯的降解，通过使用FTIR映射。还研究了辐照脆性聚丙烯的粉尘颗粒。凝胶分数已被确定为不同剂量的照射，和凝胶的出现和消失的羰基基团的时刻之间的关系已经变得明显。
Nonvolatile products have been identified that arise through γ-irradiation in isotactic polypropylene by Fourier transform infrared (FTIR) analysis. The γ-irradiation was performed in the air with doses varying between 20 and 1200 kGy, for a dose rate of 800 Gy/h. The contour lines of FTIR absorption bands of carbonyl groups at different region of the cross section of an irradiated sample have been determined. The carbonyl groups arise from the concentration of esters or ketones, carboxylic acids, and γ-lactones, but their structure is different for different doses. We have also investigated the degradation of irradiated polypropylene by using FTIR mappings. Dust particles of irradiated brittle polypropylene have also been studied. The gel fraction has been determined for different doses of irradiation, and the relation between the moment of the appearance of the gel and disappearance of the carbonyl groups has been made evident.