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Compatibilisation of NR/EVA blends by natural rubber-grafted poly (dimethyl(methacryloyloxymethyl) phosphonate) compatibiliser

von Charoen Nakason, Daniel Derouet, Frédéric Gohier

Graft copolymer of natural rubber (NR) and poly(dimethyl(methacryloyloxymethyl) phosphonate (PDMMMP) (i. e. NR-g-PDMMMP) was prepared and used as a blend compatibiliser in 50/50 NR/EVA simple blends.

Influence of various loading levels of NR-g-PDMMMP (i. e. 0, 1, 3, 5, 7, 9, 12, and 15 wt.-% of NR) on rheological, dynamic, mechanical, and morphological properties was investigated. The results showed that the best compatibilisation effect was observed in the blend with a loading level of NR-g-PDMMMP at 7 wt.-%.

That is, the highest complex viscosity, tensile strength, elongation at break as well as the lowest values of tension set and tan δ value (i. e. damping factor) were observed. This indicates the highest mechanical strength and the greatest elastic response of the material.

Morphological properties of 50/50 NR/EVA blends with any loading levels of NR-g-PDMMMP compatibiliser showed co-continuous phase system. However, in the NR/EVA blend with NR-g-PDMMMP at a loading level of 7 wt.-%, the finest phase morphology was observed.

The 50/50 NR/EVA blend with lower and higher loading amounts of NR-g-PDMMMP compatibiliser exhibited inferior dynamic, mechanical properties as well as larger phase morphologies.