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By iSmithers Rapra

ISBN-10: 1847353959

ISBN-13: 9781847353955

ISBN-10: 1847357660

ISBN-13: 9781847357663

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This change in RI has to be compensated through appropriate lens-design. 1,39 LSR 7060 post cured LSR 7070 post cured LSR 7080 post cured extrapolated RI of LSR 7060 extrapolated RI of LSR 7080 extrapolated RI of LSR 7070 1,38 1,37 1,36 1,35 0 50 100 Temperature [ °C ] 150 Fig. 5: Refractive index for different plastics and for LSR 7070 LSR LSR LSR LSR LSR LSR LSR 7005 7030 7040 7050 7060 7070 7080 Hardness in Shore A 5 30 40 50 60 70 80 Transparency [%] 94 95 95 95 95 95 95 Refraction Index at 23°C 1,405 1,405 1,405 1,405 1,404 1,41 1,402 Tensile strength [MPa] 0,3 3 4,8 6,6 6,7 10 10 of transparency, enabling designers of high performance mass production parts to pass the limits of existing engineering materials including glass, RTVs or amorphous thermoplastics.

S. 0 H/Vi ratio  Impact of the length of vinyl terminated polymers  Polyaddition elastomer mechanical properties depend on the length of the main vinyl polymer : an increase in its viscosity leads to a decrease in the hardness together with an increase in the tear strength and in the elongation at break. There are some logarithm relationships between these properties and the viscosity : Shore A hardness, Elongation at break, Tear strength = a * Ln(viscosity) + b. s. s)  Impact of the crosslinker molecular structure  Polyaddition elastomer mechanical properties depend on the molecular structure of the SiH crosslinker, associated to the stiffness of the equivalent spring in a rubber elasticity approach.

More interestingly PDMS-31,500 based silicone-urea copolymers displayed lower hysteresis than chemically crosslinked silicone rubbers! Since critical entanglement molecular weight (Me) of PDMS is about 24,500 g/mol, results tend to indicate substantial contribution of chain entanglement in PDMS-31,500 on the tensile properties and hysteresis behavior of the silicone-urea copolymers. tr) INTRODUCTION Segmented thermoplastic elastomers (TPU) based on polydimethylsiloxane (PDMS) soft segments have been extensively studied during the last 25 years1.

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Silicone Elastomers 2009 : third international Conference, 7-8 October 2009, Hamburg, Germany : conference proceedings by iSmithers Rapra


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