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Authors
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Salaeh, S.; Das, A.; Marzec, A.; Thongnuanchan, B.; Szadkowski, B.; Wießner, S.
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Title
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Structure-property relationship of diamine cross-linked acrylate-modified natural rubber: Improving mechanical properties, shape memory behavior, and thermal stability of the vulcanizates
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Date
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17.06.2025
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Number
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0
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Abstract
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In this work, poly(methyl methacrylate)-grafted natural rubber (MGNR) was cross-linked with various diamine cross-linkers. After curing, it was demonstrated that a three-dimensional network of MGNR was formed through amide linkage formation between ester groups of MGNR and –NH2 groups of cross-linkers. The curing rate and mechanical and thermal properties strongly depended on the diamine type. The diamine-containing benzene rings enhanced stiffness and reduced elongation at break, whereas long-chain aliphatic diamine provided better flexibility. Thermal analysis revealed that cross-linking with diamine did not affect the Tg of the natural rubber (NR) phase, whereas the Tg of grafted PMMA domains changed with diamine content. At the same time, diamine-cured MGNR also demonstrated good shape fixity and recovery due to the vitrification of grafted PMMA and cross-link networks. The thermal decomposition temperature and retention of the mechanical properties after thermal treatment were significantly enhanced for diamine-cured MGNR, particularly for MGNR cured with diamine-containing benzene rings. The findings pave the way for developing high-performance MGNR composites with tailored properties for various applications. The specific diamine structures play a role in the degree of property enhancement, offering opportunities for optimizing the composites for particular needs.
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Publisher
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American Chemical Society
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Wikidata
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Citation
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ACS Applied Polymer Materials 7 (2025) 8335-8350
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DOI
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https://doi.org/10.1021/acsapm.5c01671
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Tags
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