已为您找到该学者17条结果 成果回收站
-
40浏览
-
0点赞
-
0收藏
-
0分享
-
60下载
-
0
-
引用
-
41浏览
-
0点赞
-
0收藏
-
0分享
-
51下载
-
0
-
引用
【期刊论文】Complexation between poly (N,N-diethylacrylamide) and poly(acrylic acid) in aqueous solution
柳明珠, Fengling Bian*, Mingzhu Liu*
European Polymer Journal 39(2003)1867-1874,-0001,():
-1年11月30日
The complexation between poly (N,N-diethylacrylamide) (PDEA) and poly(acrylic acid) (PAA) in aqueous solution was studied by viscometric, potentiometric, and fluorescence techniques. It was found that an interpolymer complex formed between the two polymers through hydrogen bonding interactions with the stoichiometry of r=0.6 (r is unit molar ratio of PAA/PDEA), and the complex formation show the dependence on pH values. The phase behaviour studies showed that the lower critical solution temperature of the PDEA-PAA aqueous solution gradually increased with the increasing of r from 0.01 to 0.15, until a soluble system in the whole temperature region was obtained, which remained in the range of r=0.15-0.3. At higher PAA concentrations, when r is above 0.3, the system appeared phase separation, and almost no temperature dependence was observed. Based on these conclusion and structure characteristics of PDEA and PAA, a model containing only short sequences of monomer residues was proposed for the structure of PDEA–PAA complex.
Poly (, N,, N-diethylacrylamide), , Poly (, acrylic acid), , Phase behaviour, Complexation
-
42浏览
-
0点赞
-
0收藏
-
0分享
-
321下载
-
0
-
引用
柳明珠, Shouxin Liu, , Mingzhu Liu
Journal of Applied Polymer Science, Vol. 90, 3563-3568(2003),-0001,():
-1年11月30日
A series of pH-and temperature-responsive (N,N-diethylacrylamide-co-methacrylic acid) (DEAM-MAA) random copolymers were synthesized by free-radical copolymerization techniques, and their lower critical solution temperatures (LCSTs) at different pH values and their critical phase-transition pH values at different temperatures were determined by transmittance measurements, respectively. The LCSTs of DEAM-MAA copolymers depend on the MAA content in the copolymers and are significantly affected by the pH of the aqueous solution. Similarly, the critical phase-transition pH values also depend on the MAA content of the DEAM-MAA copolymers and are significantly affected by the temperature of the aqueous solution. The LCST of DEAM-MAA copolymers increases with an increase in the MAA content. The critical phase-transition pH increases with increasing MAA content in the copolymer and also increases with increasing aqueous solution temperature.
transmittance, lower critical solution temperatures (, LCST), , copolymerization, phase behavior, radical polymerization
-
45浏览
-
0点赞
-
0收藏
-
0分享
-
211下载
-
0
-
引用
【期刊论文】Preparation and Properties of a Salt-Resistant Superabsorbent Polymer
柳明珠, Songmei Ma, Mingzhu Liu, Zhenbin Chen
Journal of Applied Polymer Science, Vol. 93, 2532-2541(2004),-0001,():
-1年11月30日
Crosslinked sodium polyacrylate was prepared by solution polymerization with N,N-methylene-bisacrylamide (bisAM) as crosslinking agent; it was subsequently surface-crosslinked by ethylene glycol diglycidyl ether (EGDE) and then was modified with inorganic salt to obtain a superabsorbent with water absorbency in 0.9 wt % NaCl aqueous solution at atmosphere and applied pressure (P≈2×103Pa) of 55 and 20 g.g-1, respectively. Moreover, it also had excellent hydrogel strength. The effects of reaction temperature, reaction time, neutralization degree (ND) of acrylic acid, amount of initiator, crosslinking agent, and surface-crosslinking agent, mass ratio of inorganic salt to initial superabsorbent, molar ratio of sodium aluminate (NaAlO2) to potassium dihydrogen hyphosphate (KH2PO4) on water absorbency (WA) in 0.9wt % NaCl aqueous, and the hydrogel modulus were investigated and optimized.
superabsorbent, salt-resistant, acrylic acid, surface-Crosslinked
-
36浏览
-
0点赞
-
0收藏
-
0分享
-
418下载
-
0
-
引用