凹凸棒石的材料矿物学实验研究

凹凸棒石对有机物,尤其对具有极性或极性基团的有机大分子有强烈的吸附作用,其机理在于它特殊的结构所导致的表面和沸石水孔道中的电性不饱和而产生的电吸附作用。凹凸棒石可以用作高分子PEK-C复合材料的填料,经过缩醛反应对凹凸棒石表面进行改性,可改善填料与基体之间内表面的粘结,提高复合材料的杨氏模量、抗张强度和断裂伸张。

Experimental Studies on the Material Mineralogy of Attapulgite

Experimental studies on the absorption of attapulgite and the effect ofattapulgite on the mecbanic properties of composites are dealt with in thispaper. The results of the experiments indicate that attapulgite has a strongabsorption effect on organic matters, especially on those that possess polarityor polarity groups. The absorption of attapulgite is attributed to the electricunsaturation at the surface of the attapulgite crystal and in the channel ofzeolitic water resulting from its spscial structure. Attapulgite can be used asthe filling material of phenolphthalein poly (ether ether ketone) composites(PEK--C). By pretreating the attapulgite With aldehydes such as butyral-dehyde and benzaldehyde, the interfacial adhesion between the filler and thematrix can be improved, and thus Young'S modulus, tensile strength andelpngation at break of composites can be enhenced. Acetalation with benzal--dehyde gives better filler--matrix bond and enhances the tensile properties ofthe composites more effectively than acetalation with butyraldehyde.