Small angle neutron scattering study of end-linked gels
Small angle neutron scattering study of end-linked gels
复制标题
端联凝胶的小角中子散射研究
DOI：
10.1021/ma00077a025
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发表时间：
1993
期刊：
影响因子：
5.5
通讯作者：
J. Bastide
中科院分区：
文献类型：
--
作者：
E. Mendes;B. Girard;C. Picot;M. Buzier;F. Boué;J. Bastide
在末端连接的凝胶中的mesophosphate浓度波动作为溶胀比的函数，使用SANS进行了研究。将凝胶散射的信号与相同浓度的线性链的半稀释溶液的信号进行比较。结果表明，凝胶物质的信号在小角度强得多，比等效的解决方案。这种散射过量归因于凝胶中存在两种类型的不均匀性。观察到两种不同类型的行为：在散射矢量q的中间值处，光谱表现出"肩部“，表明凝胶中存在”星形“物体，而在非常小的角度处，散射强度I（q）随着q非常强烈地增加。
Monomer concentration fluctuations in end-linked gels are investigated as a function of the swelling ratio using SANS. The signals scattered by the gels are compared to those of semidilute solutions of linear chains of the same concentration. It is shown that the gels matter a signal at small angles much stronger than the equivalent solutions. Such a scattering excess is attributed to the presence of two types of heterogeneities in the gel. Two different types of behavior are observed: at intermediate values of the scattering vector, q, the spectra exhibit a «shoulder» suggesting that «starlike» objects are present in the gel while at very small angles, the scattering intensity, I(q), increases very strongly with q