期刊
COLLOID AND POLYMER SCIENCE
卷 290, 期 13, 页码 1275-1284出版社
SPRINGER
DOI: 10.1007/s00396-012-2647-5
关键词
Hairy particle; Grafting from; Colloidal stability; Photo-polymerization
资金
- National Natural Science Foundation of China [50943028]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars of State Education Ministry
- Program for Liaoning Excellent Talents in University [LJQ2011037]
Poly(N-isopropylacrylamide)-grafted polystyrene/poly(styrene-co-4-vinylbenzyl N, N-diethyldithiocarbamate) [PNIPAM-grafted PS/P(St-co-VBDC)] hairy particles were synthesized by photo-polymerizing N-isopropylacrylamide monomer in the presence of PS/P(St-co-VBDC) core particles. Here, the VBDC unit, which was incorporated into the surface of core particles by seeded soap-free emulsion copolymerization, acted as a photo-iniferter. By varying the polymerization conditions, a series of hairy particles having different grafting heights and grafting densities was successfully obtained. The hairy particles exhibited well-defined core/shell morphology. PS/P(St-co-VBDC) formed the core which was surrounded by PNIPAM shell. The determination of critical coagulation concentration (CCC) indicated that the hairy particles were stabilized via both electrostatic and steric mechanisms (i.e., electrosteric mechanism) at a temperature lower than LCST of PNIPAM. However, these particles gave much lower CCCs when heated to the temperature higher than LCST, exhibiting temperature-dependent colloidal stability.
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