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標題: Poly(styrene-co-maleic anhydride) derived polymeric dispersants and organic mechanism of Clay.
作者: 許彥琦
Hsu, Yen-Chi
關鍵字: Poly(styrene-co-maleic anhydride);苯乙烯馬來酸酐共聚物;layered silicate;comb-liked;層狀黏土;梳狀型高分子
出版社: 化學工程學系
In this dissertation, a host of dispersants derived by poly(styrene-co-maleic anhydride)(SMA) were prepared.
Part 1
By varying the structure parameters of the SMA copolymer and the functions of side chain, the designed dispersants are effective to disperse several kinds of the inorganic particles. Carboxylic sodium salts (-COONa) on the SMA backbone with the ratio of styrene/MA=6/1(SMA6000) which could disperse MgSO4 in toluene phase at 12 wt % and stable for 2 month. SMA2000 grafted on the M2070 as the pendents could decrease the yellow pigments' particle size (α-FeOOH) from the range of 550-1750 nm to 210 nm and it also effective as the coloring agents (improve the color ability).SMA1000-MPEG is good for wetting the cement particle, which could reduce the water quantity (from 30g/100g to 24g/100g water/cements) for cement mixture.
Part 2
A family of comb-like polyamines was synthesized by grafting various polyoxypropylene-amines (POP-amines) on the styrene/maleic anhydride copolymers (SMA) through the amidoacid linkages. The polyamines were found to have a superior surfactancy of lowering the toluene/H2O interfacial tension until 4mN/m at extremely low critical micelle concentration (CEC) of 10-3 w%. By varying the length of amine pendents and the styrene/maleic anhydride backbone ratio, the POP-grafting copolymers enable to intercalate sodium montmorillonite (Na+-MMT) in two different manners. With the ionic exchanging intercalation, the flexible pendants may anchor into silicate interlayer by the multiple quaternary ammonium salt (-NH3+Cl−) tethering groups. The driving force of ionic exchanging rendered the embedding of organic components and also the expansion of silicate gallery from 13 Å to 44 Å. As a result, the hydrophobic backbone of SMA copolymers could generate a corona phase or partially embedding in the gallery. Two types of core-shell structure with the layered silicates as a rigid core reflect their difference in the hydrophilic/hydrophobic balance and hence the interfacial property. Their characterizations in thermal stability, dispersion in toluene and ability of decreasing surface tension are correlated to the core-shell structures.

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