TY - CHAP

T1 - EFFECT OF SILICONE HYDRIDE ON THERMAL SILICONE CURING

AU - Deriabin , K.V.

AU - Terent'ev , A.O.

AU - Islamova , R.M.

N1 - Conference code: 14

PY - 2018/11/12

Y1 - 2018/11/12

N2 - Thermally curable silicone rubber systems are known. In general, typical curing systems consist of mixtures of organic peroxide andpolysiloxanes with unsaturated groups. In this work, our silicone curing system differs from well-known systems by virtue of the factthat it uses polymethylhydrosiloxane (PMHS) as an additive and the source of the SiH and it deals with a liquid silicone rubbersystem rather than a high consistency rubber. Dibenzoyl peroxide and azobisisobutyronitrile were used as free-radical initiators forthermal curing of trivinylsilyl-terminated polymethylhydrosiloxane (PDMS-v).Mechanisms of peroxide curing of polysiloxanes is commonly described in ref.[1] Typical organic peroxides such as dibenzoylperoxide cure polysiloxanes in accordance with the mechanisms of "vinyl-to-methyl" and "vinyl-to-vinyl". In the studied PDMSv/PMHS systems a noticeably acceleration of curing is observed and can be explained by the formation of cross-links for a relativelyshort period of time by the mechanism of radical hydrosilylation as well as in case of radical hydrosilylation between monomericcompounds. [2] The bettered cure can be used to either reduce the time required to cure a material and concentration of curing agent atthe same temperature, or to reduce the temperature required for a given time. Cured samples obtained with the addition of PMHShave improved mechanical properties. So, the results of this study can be useful for industrial manufacture of polymers.

AB - Thermally curable silicone rubber systems are known. In general, typical curing systems consist of mixtures of organic peroxide andpolysiloxanes with unsaturated groups. In this work, our silicone curing system differs from well-known systems by virtue of the factthat it uses polymethylhydrosiloxane (PMHS) as an additive and the source of the SiH and it deals with a liquid silicone rubbersystem rather than a high consistency rubber. Dibenzoyl peroxide and azobisisobutyronitrile were used as free-radical initiators forthermal curing of trivinylsilyl-terminated polymethylhydrosiloxane (PDMS-v).Mechanisms of peroxide curing of polysiloxanes is commonly described in ref.[1] Typical organic peroxides such as dibenzoylperoxide cure polysiloxanes in accordance with the mechanisms of "vinyl-to-methyl" and "vinyl-to-vinyl". In the studied PDMSv/PMHS systems a noticeably acceleration of curing is observed and can be explained by the formation of cross-links for a relativelyshort period of time by the mechanism of radical hydrosilylation as well as in case of radical hydrosilylation between monomericcompounds. [2] The bettered cure can be used to either reduce the time required to cure a material and concentration of curing agent atthe same temperature, or to reduce the temperature required for a given time. Cured samples obtained with the addition of PMHShave improved mechanical properties. So, the results of this study can be useful for industrial manufacture of polymers.

UR - https://pure.spbu.ru/ws/portalfiles/portal/37659927/SPb_Conference_of_Young_Scientists_2018_Abstract_Book.pdf

M3 - Conference abstracts

SP - 92

BT - Modern problems of polymer science. 14th International Saint-Petersburg Conference of Young Scientistis

CY - SPb

Y2 - 12 November 2018 through 14 November 2018

ER -