In-Situ-Swelling Modification Of Natural Rubber And Vulcanizate Powder With (Meth) Acrylic Acid

A new method which is called in-situ-swelling preparation is proposed to get meltalic salts of unsaturated carboxylic acids, through which corrosion of acid to instruments can be avoided. The processing technology includes mixing raw rubber with zinc oxide (ZnO) and dicymul peroxide (DCP), then swelling this rubber compound for some time. The compound formulation, swelling condition, curing reactive parameter and morphology are studied to obtain better properties.Swelling modification of rubber with (meth) acrylic acid is first proposed, and it is found that this method can bring reinforcement by investigation on influence of compounding, swelling and filler. Results on modification of rubber compound show that after curing the modified NR turns into transparent from white. Analsis pof polarized microscope shows that a kind of line-like crystal appeared. Content of DCP and ZnO both effect mechanical properties. Methacrylic acid (MAA) or acrylic acid (AA) can improve properties great in which the former is much better, and get high strength, high elongation with common hardness.DSC analysis shows that exothermal reaction in 180℃ is superposition of ZDMA's polymerization and NR's vulcanization. The heat of reaction increases with prolonging of swelling time and increasing of swelling temperature. The trend of heat reaction is similar with that of strength.Swelling modification of NR vulcanizate with methacrylic acid is firstly proposed. It is showed that a new kind of composite is got from methacrylic acid and NR in high swelling temperature. The crystal mophorlogy is complexed through...