排序方式: 共有5条查询结果,搜索用时 15 毫秒
1
1.
本文通过对甲基丙烯酸酐、丙烯酸酐、邻苯二甲酸二丙烯酯及二丙烯基氰基醋酸乙酯四种交联剂分别与苯乙烯、甲基丙烯酸甲醇、乙酸乙烯酯、α-氯代丙烯酸甲酯、丙烯酸甲酯及顺丁烯二酸酐六种单烯共聚合时凝胶点转化率的研究,发现交联剂与单烯交替共聚愈好,亦即竞聚率R_1及R_2都愈小,则交联活性愈高;并指出只从R_1或只从R_2去判断交联活性高低是不够全面的。对聚合活性高的交联剂来说,只有在用量很少的情况下(如小于0.1%)才能分辨出它对不同单烯的交联活性的高低,否则都在转化率很低时即行凝胶。还测定了二丙烯基氰基乙酸乙酯分别与苯乙烯、甲基丙烯酸甲酯、乙酸乙烯酯及顺丁烯二酸酐的R_1与R_2值,分别为:0,16.1;0,5.4;0.30,0.75;0.04,1.4。 相似文献
2.
We present two new perturbation density functional theories to investigate non-uniform fluids of associating molecules. Each fluid molecule is modelled as a spherical hard core with four highly anisotropic square well sites placed in tetrahedral symmetry on the hard core surface. In one theory we apply the weighting from Tarazona's hard sphere density functional theory to Wertheim's bulk first-order perturbation theory. The other theory uses the inhomogeneous form of Wertheim's theory as a perturbation to Tarazona's hard-sphere density functional theory. Each theory approaches Tarazona's theory in the limit of zero association. We compare results from theory and simulation for density profiles, fraction of monomers, and adsorption of an associating fluid against a hard, smooth wall over a range of temperatures and densities. The non-uniform fluid theory which uses Tarazona's weighting of Wertheim's theory in the bulk is in good agreement with computer simulation results. 相似文献
3.
Kuaug-to CHAD 《理论物理通讯》1985,4(4):491-496
We suggest for the Higgs boson a Scalar Dominance Model (SDM) that interactions of the Higgs boson with hadrons proceed mainly via intermediate scalar mesons. Based on SDM the Higgs interpretation ξ (2.2) is discussed and BR(φ→γH) is calculated.The result seems to disfavor this assignment for ξ(2.2). 相似文献
4.
By using a highly accurate variational wave function with 50 parameters for hydrogen molecule[4] and the wave function of HeH+ used by Wolniewicz with 64 parameters[5], the behavior of the β-spectrum of H-T→ HeH++β-+νe is discussed. The spectral shape thus obtained deviates remarkably from the β-spectrum of an atomic triton, and hence is different from the for mula used by Lyubimov et al. in determining the neutrino mass. This means that the "atomic approximation" is invalid in describing the molecular β-spectrum of valine, and the conclusion about the value of neutrino mass based upon the analysis of β -spectrum of valine also cannot be regarded as a reliable one. Therefore, in order to obtain ari accurate value of neutrino mass from the β-spectral shape, it is important to investigate the structure of the radioactive source, from which the corection has arisen. 相似文献
5.
1