Morphology and thermal properties of pseudo interpenetrating polymer networks based on natural rubber (Manihot glaziovii) and poly(methyl methacrylate)

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• 作者：Alcâ ; ntara ; Robé ; rio Marcos ; Pinho Rodrigues ; Ana Paula ; Gomes de Barros ; Glaucione
• 关键词：Pseudo interpenetrating polymer networks ; Natural rubber ; Thermal stabilities
• 刊名：Polymer
• 出版年：1999
• 出版时间：March, 1999
• 年：1999
• 卷：40
• 期：7
• 页码：1651-1656
• 全文大小：590 K

文摘

Pseudo interpenetrating polymer networks were prepared by a sequential method using a high molecular weight natural rubber and poly(methyl methacrylate), PMMA. The thermal properties and morphology were investigated varying the average molar mass between crosslinks () and the composition. The extent of crosslinking of natural rubber plays a major role in the transitions domains whatever the sample composition. As the crosslink density decreases, only one T_g value is observed ( of 500 and 1000 g/mol). Comparison between the pseudo IPNs at different values and compositions indicates that there are no significant differences in the thermal stabilities of the materials. Crosslinking and the component composition had a strong effect on the morphological patterns of the samples. For a higher crosslink density (=142 g/mol), close and compact phase domains can be seen. The morphologies for lower crosslink densities ( of 500 and 1000 g/mol) showed fibrillar domains characteristic of the PMMA.