Synthesis of uniform PMMA microspheres employing modified SPG (shirasu porous glass) emulsification technique

Abstract

SYNOPSISApplication of the particulate microporous glass membrane (SPG) was extended to the synthesis of fairly monodisperse poly(methy1 methacrylate) (PMMA) microspheres. Hydrophilic monomers have been believed to yield polymer particles of a broad size distribution when the SPG technique was employed. This difficulty was overcome by adopting the droplet swelling technique. The primary uniform emulsion composed of a mixture of hydrophobic diluent (and/or monomer), cosurfactant, and initiator was prepared with an SPG membrane and was allowed to absorb MMA (and diluent) under the principle of the degradative diffusion process from droplets in the secondary emulsion. The coefficient of variation of PMMA spheres was around 10%. Porous PMMA spheres possessing up to 185 m2/g of specific surface area were obtained as well as one-eyed spheres and smooth and solid spheres. 0

Dependence of Temperature-Sensitivity of Poly(N-isopropylacrylamide-co-acrylic acid) Hydrogel Microspheres upon Their Sizes

“…Fifteen milliliters of aqueous monomer solution containing 3.6 M N-IPAAm, 0.4 M AAc, 0.03 M MBAAm, and 0.005 M AP was dispersed in an oil phase composed of 500 ml of cyclohexane containing 1.0% (v/v) SUNSOFT818H to prepare w/o emulsion by the use of a MPG (microporous glass) membrane apparatus (Ise Chemical Corp.) equipped with a SPG membrane (13)(14)(15). The emulsion was stirred at 700 rpm to prevent aggregation.…”

Study on Preparation and Morphology of Uniform Artificial Polystyrene–Poly(methyl methacrylate) Composite Microspheres by Employing the SPG (Shirasu Porous Glass) Membrane Emulsification Technique

“…Young's equation as shown in Eqs. [2] and [3] was employed to calculate the interfacial tensions between polymer and the aqueous phase and between polymer and LOH for PMMA and PST:…”

Microencapsulation of a PCM through membrane emulsification and nanocompression-based determination of microcapsule strength

“…Previous work by Omi et al [14] proposed the production of poly(methyl methacrylate) microcapsules (PMMA) through the use of SPG membrane emulsification.…”