NDLI: Thermoplastic natural rubbers based on natural rubber (NR) and ethylene vinyl acetate copolymer (EVA) with natural rubber-graft- poly(dimethyl(methacryloyloxymethyl)phosphonate) (NR-g-PDMMMP) as compatibilizer

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Thermoplastic natural rubbers based on natural rubber (NR) and ethylene vinyl acetate copolymer (EVA) with natural rubber-graft- poly(dimethyl(methacryloyloxymethyl)phosphonate) (NR-g-PDMMMP) as compatibilizer

Content Provider	Semantic Scholar
Author	Intharapat, Punyanich
Copyright Year	2009
Abstract	Des copolymeres greffes a base de caoutchouc naturel (NR) et de poly(acryloyloxymethylphosphonate de dimethyle) (NR-g-PDMAMP), de poly(methacryloyloxyethylphosphonate de dimethyle) (NR-g-PDMMEP) et de poly(methacryloyloxymethylphosphonate de dimethyle) (NR-gPDMMMP), ont ete synthetises en milieu latex selon la methode dite « grafting from » a partir de sites amorceurs photosensibles N ,Ndiethyldithiocarbamate prealablement introduits le long des chaines 1,4-polyisoprene du caoutchouc naturel. Des etudes de compatibilisation des melanges caoutchouc naturel (NR) / copolymere d'ethylene - acetate de vinyle (EV A) ont par la suite ete envisagees avec le copolymere NR-gPDMMMP, choisi comme agent compatibilisant. Elles ont ete effectuees sur des melanges simples 50/50 NR/EV A, mais aussi des melanges dynamiquement vulcanises 40/60 NR/EVA. Dans les deux cas,les influences du taux de greffage du NR-g-PDMMMP (71, 80, 89, et 95%) et du taux de chargement en compatibilisant (0, 1,3,5,7,9,12, et 15 % en poids par rapport au NR) sur les proprietes rheologiques, dynamiques, mecaniques, morphologiques, et thermiques, ont ete etudiees. Les meilleurs effets de compatibilisation ont ete observees avec un copolymere NR-g-PDMMMP ayant un taux de greffage de 80 %, pour un taux de chargement de 7 % dans le cas du melange simple 50/50 NR/EV A et de 9 % dans celui du melange dynamiquement vulcanise 40/60 NR/EV A. Les etudes microscopiques par SEM des melanges ont montre une reduction de la taille des domaines. Il a aussi ete note que la stabilite thermique du melange NR/EVA se trouve renforcee avec l'incorporation du NR-g-PDMMMP.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://cyberdoc.univ-lemans.fr/theses/2009/2009LEMA1005.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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