Properties of Cross-Linked Phenolic Resins
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Structure–property relationships of cross-linked phenolic resins have been studied by using atomistic molecular dynamics simulations. The cross-linked structures were prepared by cross-linking reactions of linear phenolic resin oligomers (9-mer). In this study, three cross-linked structures with degrees of cross-linking (D) of 70%, 82%, and 92% were investigated. |
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Fig.1 Cross-linking reaction model of phenolic resins. |
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Fig.2 Structure of a cross-linked phenolic resin. |
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In order to evaluate the effect of D on glass transition temperature (Tg ), specific volume was calculated as a function of temperature. As shown in Fig.3, an increase in D accompanies an increase in Tg. This indicates that segmental motions were suppressed by the cross-links. In addition, to estimate mechanical properties in a glassy state of the cross-linked structures, uniaxial elongations were performed at 300 K. Fig.4 shows the calculated stress-strain curves, which indicates a clear dependence of the curve on D. The details of this study are also described in ref.1. |
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Fig.3 Change in specific volume: red, D = 70%; blue, D = 82%; green, D = 92%. The glass transition temperature of each structure was determined from the change in the slope. |
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Fig.4 Stress–Strain Curves: red, D = 70%; blue, D = 82%; green, D = 92%. |
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Reference |
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