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|標題:||Poly(styrene-co-maleic anhydride) derived polymeric dispersants and organic mechanism of Clay.
|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||摘要:||
In this dissertation, a host of dispersants derived by poly(styrene-co-maleic anhydride)(SMA) were prepared.
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.
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.
|Appears in Collections:||化學工程學系所|
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