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Investigation of the effects of NaA-type zeolite on PDMS composites

机译：NaA型沸石对PDMS复合材料影响的研究

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The aim of this article was to investigate the effect of a NaA-type zeolite on a polydimethylsiloxane (PDMS)-zeolite composite. The obtained results show that the introduction of a NaA-type zeolite into polysiloxane matrices results in a change of the equilibrium degree of swelling (DSe) of composites in toluene, their hardness, and their thermal stability. With increase in the zeolite, the time required to achieve the DSe is reduced, DSe decreases, and hardness increases. A. double effect of the zeolite concentration on the change of the composite characteristics was noted. At zeolite concentrations of up to 20%, there is a drastic change of the DSe and hardness with zeolite concentration, while this effect is considerably less pronounced at higher concentrations. The results obtained show that a NaA-type zeolite plays the role of a reinforcing filler. A new mechanism of bonding the zeolite into the composite was suggested. According to this model, there is a possibility that bonds are established between the polymer and the zeolite via interaction of the ii-bond of terminal vinyl groups of PDMS with the Na cation of the zeolite. With increase in the zeolite concentration in the composite, the total number of established polymer-zeolite bonds increases, but the density of the interaction decreases. This explains the change in the characteristics of the composite with the change of zeolite concentration. (C) 2000 John Wiley & Sons, Inc. [References: 7]
机译：本文的目的是研究NaA型沸石对聚二甲基硅氧烷（PDMS）-沸石复合材料的影响。所得结果表明，将NaA型沸石引入聚硅氧烷基体导致复合材料在甲苯中的平衡溶胀度（DSe），其硬度和其热稳定性的变化。随着沸石的增加，达到DSe所需的时间减少，DSe减少，并且硬度增加。注意到了沸石浓度对复合特性变化的双重影响。当沸石浓度高达20％时，DSe和硬度会随着沸石浓度的变化而急剧变化，而在较高的浓度下，这种影响就不那么明显了。所得结果表明，NaA型沸石起着增强填料的作用。提出了一种将沸石粘结到复合材料中的新机理。根据该模型，存在通过PDMS的末端乙烯基的ii-键与沸石的Na阳离子的相互作用在聚合物和沸石之间建立键的可能性。随着复合物中沸石浓度的增加，建立的聚合物-沸石键的总数增加，但相互作用的密度降低。这解释了随着沸石浓度的变化复合材料特性的变化。 （C）2000 John Wiley＆Sons，Inc. [参考：7]

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