Oil bleed from elastomeric thermal silicone conductive pads

doi:10.1007/s11705-016-1586-y

Front. Chem. Sci. Eng.

2016, Vol. 10

Issue (4) : 509-516 https://doi.org/10.1007/s11705-016-1586-y

RESEARCH ARTICLE

Oil bleed from elastomeric thermal silicone conductive pads

Yuqi Chen¹,Yakai Feng^1,²(

),Jingqi Zhao³,Jingbo Shen³,Menghuang Feng³

¹. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
². Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin), Tianjin 300072, China
³. Tianjin Laird Electronic Material Co., Ltd. Tianjin 300457, China

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Abstract

Oil bleed is a serious problem in elastomeric thermal silicone conductive pads. The components of the oil bleed and the effect of the silicone chemical parameters on the amount of oil bleed have been determined. The main components of oil bleeds are the uncrosslinked silicones in the cured resins, which include the unreacted silicone materials and the macromolecular substances produced by the hydrosilylation reaction. Cured resins with a high crosslinking density and a high molecular weight of vinyl silicone residues had a lower amount of oil bleed. In addition, a low Si-H content also reduced the amount of oil bleed.

Keywords oil bleed crosslinking density molecular weight vinyl silicones hydrosilicones

Corresponding Author(s): Yakai Feng

Just Accepted Date: 26 August 2016 Online First Date: 12 September 2016 Issue Date: 29 November 2016

Cite this article:

Yuqi Chen,Yakai Feng,Jingqi Zhao, et al. Oil bleed from elastomeric thermal silicone conductive pads[J]. Front. Chem. Sci. Eng., 2016, 10(4): 509-516.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-016-1586-y
https://academic.hep.com.cn/fcse/EN/Y2016/V10/I4/509

Fig.1 Crosslinking reaction of silicone resins

Fig.2 An example of bleeding oils on the device surface

Tab.1 The weight content of functional groups in the silicones

Tab.2 Molar ratio of Si-Vi : Si-H for the simplified silicone matrix model system

Tab.3 Si-Vi and Si-H contents for the silicones as determined by ¹H NMR and molecular weight for the vinyl silicones as determined by GPC

Fig.3 Partial ¹H NMR spectra of the bleeding oils from the cured resin of Vi-2 reacted with H-1, the original vinyl silicone Vi-2, and H-1

Fig.4 GPC data of vinyl silicone Vi-2 (black line), uncrosslinked components in the cured resin (red line), and bleeding oils (blue line) from the cured resin when Vi-2 reacted with H-1

Fig.5 Partial ¹H NMR spectra of bleeding oils from Vi-1 reacted with H-1, and original silicone materials

Fig.6 GPC data of vinyl silicone (black line), uncrosslinked components in cured resin (red line), and bleeding oils (blue line) from the cured resin of Vi-1 reacted with H-1

Fig.7 Partial ¹H NMR spectra of bleeding oils from cured resin of Vi-1 reacted with H-2, original silicone Vi-1 and H-2 (Si-Vi : Si-H of 3 : 1)

Fig.8 GPC data of vinyl silicone Vi-1 (black line), uncrosslinked components in cured resin (red line), and bleeding oils (blue line) of cured resin of when Vi-1 reacted with H-2

Fig.9 Effect of crosslinking density on oil bleed when vinyl silicones reacted with H-1 at the ratio of Si-Vi : Si-H= 1 : 1.14

Fig.10 Effect of molecular weight of vinyl silicones on oil bleed when vinyl silicones reacted with H-2 at the ratio of Si-Vi : Si-H= 3 : 1

Fig.11 Effect of molecular weight of polydimethylsiloxane (PDMS, 1%) on oil bleed

Fig.12 Effect of hydrosilicones on oil bleed from cured resins when different vinyl silicones reacted with H-2 and H-3 at a molar ratio of Si-Vi : Si-H= 3 : 1

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