Chiang Mai Journal of Science

Print ISSN: 0125-2526 | eISSN : 2465-3845

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Synthesis and Characterization of Admicelled Natural Rubber with Poly(methyl methacrylate)-co-Poly((3-trimethoxysilyl) propyl methacrylate) and Evaluation of the Properties of its Vulcanizates

Suparat Nooma and Rathanawan Magaraphan*
* Author for corresponding; e-mail address: rathanawan.k@chula.ac.th; krathana@gmail.com
Volume: Vol.46 No.2 (March 2019)
Research Article
DOI:
Received: 9 May 2018, Revised: -, Accepted: 27 August 2018, Published: -

Citation: Nooma S. and Magaraphan R., Synthesis and Characterization of Admicelled Natural Rubber with Poly(methyl methacrylate)-co-Poly((3-trimethoxysilyl) propyl methacrylate) and Evaluation of the Properties of its Vulcanizates, Chiang Mai Journal of Science, 2019; 46(2): 387-407.

Abstract

 Admicelled natural rubber (adNR) vulcanizates were prepared from NR modified by coating with poly(methyl methacrylate)-co-poly((3-trimethoxysilyl) propyl methacrylate), PMMA-co-PMPS shell. The core-shell structure of adNR was achieved after admicellar polymerization, using PMMA at 10 parts per hundred rubber (phr) and PMPS at 0-50 phr miscible in the mixture. During admicellar polymerization, hydrolysis and condensation of PMPS simultaneously with the free radical copolymerization of MPS and MMA give rise to the crosslink structure in the PMMA-co-PMPS shell, and these formations were assessed by FT-IR and H-NMR. The thermal stability of adNR was enhanced by the Si in PMMA-co-PMPS shells acting as an efficient diffusion barrier that hindered random scission of the polymer chains. The adNR vulcanizates were prepared by using conventional sulfur vulcanizing system. The mechanical properties, dynamic mechanical properties and swelling resistance improved with vulcanization and these were further enhanced by the PMMA-co-PMPS in the coating shell. The PMMA coating (adNR with PMMA 10 phr, P10), also with a low amount of PMPS (adNR with PMMA 10 phr and PMPS 12 phr, P10-S12), did not significantly affect the ozone resistance. However, ozone resistance then increased with further PMPS content (adNR with PMMA 10 phr and PMPS 12, 37 and 50 phr, respectively; P10-S25, P10-S37 and P10-S50). This high ozone resistance of adNR arises from the poor access of ozone to the double bonds in NR, protected by the encapsulating coating.

Keywords: natural rubber, vulcanization, coating, admicellar polymerization, silicon containing polymer

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