Grafting of methyl methacrylate on isoprene rubber

Abstract

Methyl methacrylate has been grafted on artificial isoprene rubber (IR) latex, with use of redox initiation. The properties of latices containing up to 40 phr methyl methacrylate (MMA) as well as solid products containing up to 80 phr of this compound were studied. Compared with ungrafted IR latex with the same solids content, the grafted IR latices had a lower viscosity, owing to their particle size being larger. Vulcanised films obtained from the grafted latices showed a considerably higher modulus, particularly at large deformations, than those based on IR or blends of IR with polymethyl methacrylate. by incorporation of certain reinforcing white fillers in the MMA‐grafted IR latices, a further increase in the modulus of the latex films was effected.

Kajian Elektrolit Polimer berasaskan Getah Asli Terubah Suai (MG49) dalam Sel Suria Terpeka Pewarna

“…Antaranya, penggunaan getah asli terubah suai sebagai polimer perumah seperti 50% getah asli terepoksida (ENR50), 30% poli(metil metakrilat) (PMMA) cangkukan getah asli (MG30) dan 49% PMMA cangkukan getah asli (MG49) yang mampu mencapai kekonduksian ion yang tinggi. Pencangkukan monomer metil metakrilat (MMA) pada lateks getah semula jadi (struktur kimia ditunjukkan dalam Rajah 1) pertama kali dilaporkan pada tahun 1967 oleh Waterman et al (1967) tetapi ia hanya mula mendapat perhatian pada pertengahan abad ke-20; kerana ciri-ciri kekutuban dan suhu peralihan kaca, T g yang rendah (untuk mobiliti rantaian yang lebih baik). Glasse et al (2002) menyedari hal ini dan membuktikan fungsi getah asli terubah suai sebagai medium untuk mengangkut ion.…”