Lee, Se Geun Kim, Jae Pil Kwon, Ick Chan Shin, Dong Soo Han, Sung Soo Lyoo, Won Seok 2024-01-21T02:31:04Z 2024-01-21T02:31:04Z 2021-09-01 2006-09-15 0021-8995 https://pubs.kist.re.kr/handle/201004/135120 To estimate influences of suspension polymerization conditions including conversion, polymerization temperature, stirring rate, initiator concentration, monomer concentration, and suspending agent concentration on the volume average diameter (D-avg) and particle size distribution (PSD) of poly(vinyl acetate) (PVAc) microspheres, vinyl acetate (VAc) was suspension-polymerized at low temperature using 2,2'-azobis(2,4-dimethylvaleronitrile) as an initiator. The effects of each condition, on D-avg of PVAc microspheres, were expressed as follows, D-avg = [conversion](a)[temperature](b) [rpm](c)[ADMVN](d)[VAc](f) [suspending agent](g). Logarithms of D-avg were linearly proportional to those of polymerization conditions, and their exponents, a, b, c, d, f, and g were calculated as 0.27, -13.7, -1.37, -0.21, 0.58, and 0.29, respectively. Variations of PSDs, according to polymerization conditions, were examined by considering polymerization rate, droplet or suspension viscosity, and droplet break-up/coagulation equilibrium. From these results, PVAc microspheres with various sizes and narrow PSDs were obtained effectively under carefully controlled polymerization conditions, which can be used as promising precursors of novel PVA microspheres through heterogeneous surface saponification. (c) 2006 Wiley Periodicals, Inc. English JOHN WILEY & SONS INC 2-HYDROXYETHYL METHACRYLATE ALCOHOL) MICROFIBRILS HIGH-YIELD POLY(2-HYDROXYETHYL METHACRYLATE) CHEMICAL MODIFICATION METHYL-METHACRYLATE COPOLYMER MICROENCAPSULATION PIVALATE Preparation of poly(vinyl acetate) microspheres with narrow particle size distributions by low temperature suspension polymerization of vinyl acetate Article 10.1002/app.23242 1 JOURNAL OF APPLIED POLYMER SCIENCE, v.101, no.6, pp.4064 - 4070 JOURNAL OF APPLIED POLYMER SCIENCE 101 6 4064 4070 scie scopus 000239445500067 2-s2.0-33748298881 Polymer Science Polymer Science Article 2-HYDROXYETHYL METHACRYLATE ALCOHOL) MICROFIBRILS HIGH-YIELD POLY(2-HYDROXYETHYL METHACRYLATE) CHEMICAL MODIFICATION METHYL-METHACRYLATE COPOLYMER MICROENCAPSULATION PIVALATE suspension polymerization PVAc microspheres narrow PSD