caa a22 4500 465814360 CHVBK 20180323112123.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF01376793 doi (NATIONALLICENCE)springer-10.1007/BF01376793 Finite shear strain behavior of a crosslinking polydimethylsiloxane near its gel point [Elektronische Daten] [S. Venkataraman, H. Winter] A power law distribution of relaxation times, large normal stress differences, and physical rupture of molecular network strands dominate the shear behavior of polymers at the gel point (critical gels). This is shown in a series of well-defined experiments with increasing magnitude of shear on a model-network polymer system consisting of a linear, telechelic, vinyl-terminated poly-dimethylsiloxane (PDMS) and a four-functional siloxane crosslinker. Stable samples were prepared by stopping the crosslinking reaction at different extents of reaction in the vicinity of the gel point (GP). The Gel Equation has been shown to be valid up to strains of about 2 when using a finite strain tensor. Larger strains have been found to disrupt the network structure of the crosslinking polymer, and introduce a mechanical delay to the gel point. A sample that was crosslinked beyond the gel point (p>p c ) can be reduced from the solid state to a critical gel, or even to a viscoelastic liquid, depending on the magnitude of shear strain. As a consequence, the relaxation exponent of a critical gel created under the influence of shear is less than that of a quiescently crosslinked critical gel. Steinkopff, 1990 G el p oint nationallicence g el e quation nationallicence p olydimethylsiloxane nationallicence s hear modification nationallicence Venkataraman S. Department of Chemical Engineering, University of Massachusetts, 01003, Amherst, MA, USA aut Winter H. Department of Chemical Engineering, University of Massachusetts, 01003, Amherst, MA, USA aut Rheologica Acta Steinkopff-Verlag 29/5(1990-09-01), 423-432 0035-4511 29:5<423 1990 29 397 https://doi.org/10.1007/BF01376793 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01376793 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Venkataraman S. Department of Chemical Engineering, University of Massachusetts, 01003, Amherst, MA, USA aut NATIONALLICENCE 700 1- Winter H. Department of Chemical Engineering, University of Massachusetts, 01003, Amherst, MA, USA aut NATIONALLICENCE 773 0- Rheologica Acta Steinkopff-Verlag 29/5(1990-09-01), 423-432 0035-4511 29:5<423 1990 29 397 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer