壳聚糖辐射效应的研究（Ⅰ）──辐照剂量与分子量的关系及辐射裂解的G（S）值

通过粘度的测量，考察了壳聚糖在不同条件下经不同剂量γ射线辐照所引起的分子量的变化，并分别计算了真空和空气中壳聚糖辐射裂解的Ｇ（Ｓ）值。     

THE EFFECT OF CHAIN FLEXIBILITY OF FLUOROPOLYMERS ON THEIR RADIATION CROSSLINKING BEHAVIOR

The effect of chain flexibility of fluoropolymers on their radiation crosslinking behavior is studiedand the relationship between sol fraction and the radiation dose to the fluoropolymers given in ourprevious report is confirmed.     

聚偏氟乙烯的辐射交联及其交联度的XPS表征

本文首次用XPS研究了聚偏氟乙烯的辐射交联机理,交联度的XPS表征。计算出聚偏氟乙烯的β值为0.7,发现聚偏氟乙烯的辐射交联的溶胶分数与辐照剂量的关系符合我们提出的通式^[1]。用XPS方法求得聚偏氟乙烯的凝胶化剂量为1.59mrad。     

含氟聚合物交联度的XPS表征

本文研究了用X-光电子能谱(XPS)求F-46(四氟乙烯—六氟丙烯共聚物),含氟聚酰亚胺和聚偏氟乙烯的凝胶化剂量(Rg),并表征其交联度。目前交联的含氟聚合物的XPS研究,特别是用它表征交联度还未见文献报告。实验结果表明这些含氟聚合物的辐射交联是通过脱氟原子进行的,其F/C(氟原子与碳原子比)必然随交联度的增加而下降,从而与其交联度相关。以交联样品的logF/C对logR(辐照剂量)做图,或以logⅠ(含氟原子碳基团的Cls峰的相对强度)对logR做图,可以求得Rg值。用XPS方法和凝胶含量方法求得的Rg值较一致。     

CHARACTERIZATION OF RADIATION CROSSLINKING DENSITY OF F-40

In this paper, radiation-induced crosslinking mechanism and characterization of the crosslinking density of F-40 and F-4 by X-ray photoelectron spectroscopy (XPS) have been studied. The dose of gelation of F-40 obtained from XPS is 4.1×10~4 Gy. It is found that crosslinking density is the largest in the range of certain dose for F-40 and F-4.