Deuterium NMR of Strained Swollen Crossunked Elastomers: Effect of Crosslink Density on the Orientational Order of Chain Segments |
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Authors: | Daiwen Yang Fei Li Zhuwen Qiu |
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Institution: | Institute of Theoretical Chemistry, Jilin University , Changchun, Jilin, People's Republic of China |
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Abstract: | The 2H NMR of uniaxially strained swollen chloroprene rubbers and butadiene-styrene copolymers with different crosslink densities is studied. the relative number of chain segments between cross-links of various samples is obtained. the results are in approximate agreement with those obtained from the Flory equilibrium-swelling method. It is found that the enhancement factor G depends not only on the lattice-walk model and swelling of rubber, such as Tanaka etc. expected, but also on the crosslink density and the structure of the rubber. the formula relating G to the number of chain segments between cross links is derived from theory. Moreover, we can also estimate the relation between the enhancement factor Gr of real rubber and G calculated from the theory of the lattice model. the 2H NMR results of these samples indicate that the interaction between chain segments decreases with increasing crosslink density. |
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Keywords: | Titanium dioxide nanoparticle functionalization aniline graft polymerization nanocomposites |
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