Influence of hydrophilic–lipophilic balance of nonionic emulsifiers on emulsion copolymerization of styrene and methacrylic acidSpringer Science and Business Media LLC - Tập 285 - Trang 1755-1761 - 2007
Masayoshi Okubo, Amorn Chaiyasat, Masahiro Yamada, Toyoko Suzuki, Hiroshi Kobayashi
Emulsion copolymerizations of styrene and methacrylic acid (MAA) with various nonionic emulsifiers having a hydrophilic–lipophilic balance (HLB) range of 13.7–17.2 were performed to clarify the influence of emulsification state on polymerization. The emulsification state with a lower-HLB value emulsifier was worse than that with a higher one. In the lowest HLB value, MAA was predominantly polymeri...... hiện toàn bộ
The βα growth transition of isotactic polypropylene during stepwise crystallization at elevated temperatureSpringer Science and Business Media LLC - Tập 293 - Trang 2823-2830 - 2015
Jiying Wang, Zhongjie Ren, Xiaoli Sun, Huihui Li, Shouke Yan
Growth transition from β-isotactic polypropylene (iPP) to its α phase during the stepwise crystallization process is investigated. β-iPP hexagonites and spherulites are prepared first at 135 °C by using pimelic calcium as a nucleation agent, and transformation of them to their α-counterparts is realized by continuous isothermal crystallization at elevated temperatures, e.g., 151 °C. The β to α gro...... hiện toàn bộ
Preparation of poly(N-normalpropyl- acrylamide) gel beadsSpringer Science and Business Media LLC - Tập 276 - Trang 362-367 - 2014
S. Horiguchi, K. Miyamoto, M. Tokita, T. Komai
The gel beads of N-normal-propylacrylamide are prepared by the radical copolymerization of N-normalpropylacrylamide and N,N′-methylene-bis-acrylamide in water. The optimum reaction conditions to obtain the gel beads are revealed from the phase diagram of the reaction system together with the scanning electron microscopy of the reaction products. The scanning electron microscopy of the reaction pr...... hiện toàn bộ