Aranguren MI, Mora E, Macosko CW
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota, 55455
J Colloid Interface Sci. 1997 Nov 15;195(2):329-37. doi: 10.1006/jcis.1997.5143.
The properties of mechanically mixed suspensions of fumed silicas in polydimethylsiloxane (PDMS) were studied. The work focuses on two aspects: (i) Adsorption of PDMS onto silicas by means of the mechanical mixing of the bulk polymer and untreated or chemically modified fumed silicas. The silica-PDMS suspensions were completely dispersed or only swollen by a solvent, depending on the filler concentration, the silica surface chemistry, and the polymer molecular weight. The bound rubber content of the different preparations was determined by a weight difference technique and by carbon analysis of the samples and was compared with previously reported values in similar systems. (ii) The effect of the mechanical mixing on the final aggregate size of the silica and on the polymer molecular weight distribution. One PDMS and silicas of different surface area and surface chemistry were used. The final size of the aggregates after a long mixing time with the bulk polymer was approximately the same in all cases. Copyright 1997 Academic Press. Copyright 1997Academic Press
研究了气相法二氧化硅在聚二甲基硅氧烷（PDMS）中的机械混合悬浮液的性质。这项工作集中在两个方面：（i）通过本体聚合物与未处理或化学改性的气相法二氧化硅进行机械混合，使PDMS吸附到二氧化硅上。根据填料浓度、二氧化硅表面化学性质和聚合物分子量的不同，二氧化硅-PDMS悬浮液可能完全分散，也可能仅被溶剂溶胀。通过重量差技术和样品的碳分析来测定不同制剂的结合橡胶含量，并与类似体系中先前报道的值进行比较。（ii）机械混合对二氧化硅最终聚集体尺寸和聚合物分子量分布的影响。使用了一种PDMS以及不同表面积和表面化学性质的二氧化硅。在所有情况下，与本体聚合物长时间混合后聚集体的最终尺寸大致相同。版权所有1997年学术出版社。版权所有1997年学术出版社
