Preparation and characterization of a foam regulator with ultra‐high molecular weight

Abstract

Multistage emulsion polymerization was used to prepare ultra-high molecular weight foam regulator of low cost, with methyl methacrylate (MMA), butyl acrylate (BA), styrene (St) as main raw materials. Ubbelohde viscometer, dynamic light scattering, infrared and raman spectra, TEM, DSC, TGA, and GPC were all used to characterize constituent and structure, morphology, and molecular weight. As a result, when the ratio of soft monomer (BA) and hard monomer (St 1 MMA) is 1:3, MMA:St 5 4:1, potassium persulfate (KPS): 0.15%, sodium hydrogen sulfite (SHS): 0.05%, azodiisobutyronitrile (AIBN): 0.15%, divinyl benzene (DVB): 0.3%, the final product terpolymer has obvious core-shell structure and ultra-high molecular weight (M w 5 1,400,000). This kind of foam regulator showed improvements in the melt strength, prevention of bubble coalescence and reduction on cost when compared with the traditional. Finally, the coefficients of poly (methyl methacrylate-butyl acrylate-styrene) terpolymer's Mark-Houwink equation were calculated with tetrahydrofuran (THF) solvent at 25 8C.