Effect of Precursor Concentration and Precursor Molecular Weight on the Modulus and Swelling of Poly (dimethyl) Siloxane NetworksCornell University, 1999 - 186 pages |
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absence of solvent best-fit lines blob catalyst commercial PDMS networks Cornell University cross-links data points degree of equilibrium dry modulus versus dry network effect of entanglements elastic chains elastic modulus end-linked entanglement contribution equations shown equilibrium swelling experimental results flask Flory-Rehner model free energy Gb³ Gdry heptane high molecular weight junction low molecular weight Macromolecules methanol modulus after cure modulus during swelling molecular weight precursors monomer number of elastic obtained Obukhov et al13 PDMS networks prepared PDMS networks swollen PDMS precursors Plot polymer chains polymer volume fraction precursor chains precursor molecular weights precursor preparation concentration preparation concentration decreases prepared in solution scaling exponents scaling laws shear modulus silane siloxane oligomer swelling for PDMS swelling in toluene swelling Q swollen in siloxane swollen modulus swollen network synthesized theoretical trapped entanglements tri-methyl terminated PDMS unreacted variation of modulus versus precursor preparation vinyl terminated weight networks Wsol Young's modulus Φο