Structuring of hydroxy-terminated polydimethylsiloxane filled by fumed silica

The term “structuring” used in silicone rubber describes a phenomenon of the increase in the viscosity of polydimethylsiloxane filled with silica during storage, which limits the applications of the room temperature vulcanized (RTV) silicone rubber in the field of aerospace and military. In this pur...

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Autores principales:	Peng Zhengwei, Qin Yan, Song Jiuqiang, Zhu Di, Chen Shuisheng, Ren Jingwen, Li ZhuangZhuang, Zou Zhenyue
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	pdms rtv crepe hardening structuring fumed silica Polymers and polymer manufacture TP1080-1185
Acceso en línea:	https://doaj.org/article/73b7d618556b41bb9f931380737bd680
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spelling	oai:doaj.org-article:73b7d618556b41bb9f931380737bd6802021-12-05T14:10:47ZStructuring of hydroxy-terminated polydimethylsiloxane filled by fumed silica1618-722910.1515/epoly-2021-0012https://doaj.org/article/73b7d618556b41bb9f931380737bd6802021-01-01T00:00:00Zhttps://doi.org/10.1515/epoly-2021-0012https://doaj.org/toc/1618-7229The term “structuring” used in silicone rubber describes a phenomenon of the increase in the viscosity of polydimethylsiloxane filled with silica during storage, which limits the applications of the room temperature vulcanized (RTV) silicone rubber in the field of aerospace and military. In this pursuit, the present study was envisaged to solve the problem of structuring of the RTV. A solvent-free method was used to hydrophobize the hydrophilic silica with hexamethyldisilazane. An RTV composition prepared using eight parts of hydrophobic silica with 2.91% C content exhibited a viscosity of less than 100 Pa s, with no significant change in 21 days. In contrast, eight parts of the hydrophilic fumed silica showed an initial viscosity of RTV to be greater than 2,000 Pa s. Silica samples with different adsorbed water content were used to prepare the RTV compositions. It was found that the viscosity of the RTV prepared using the sufficiently dried silica was 5.6 times lower than that of the wet silica. The “dissolution” model of the silica–silica hydrogen bonds in water was proposed. Furthermore, the change in the viscosity of the RTV compositions at different temperatures in the range of −15°C to 30°C was studied. The viscosity of RTV stored at –15°C for 34 days did not change significantly, whereas that stored at room temperature increased from 100 to 1,710 Pa s within 21 days.Peng ZhengweiQin YanSong JiuqiangZhu DiChen ShuishengRen JingwenLi ZhuangZhuangZou ZhenyueDe Gruyterarticlepdmsrtvcrepe hardeningstructuringfumed silicaPolymers and polymer manufactureTP1080-1185ENe-Polymers, Vol 21, Iss 1, Pp 131-139 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	pdms rtv crepe hardening structuring fumed silica Polymers and polymer manufacture TP1080-1185
spellingShingle	pdms rtv crepe hardening structuring fumed silica Polymers and polymer manufacture TP1080-1185 Peng Zhengwei Qin Yan Song Jiuqiang Zhu Di Chen Shuisheng Ren Jingwen Li ZhuangZhuang Zou Zhenyue Structuring of hydroxy-terminated polydimethylsiloxane filled by fumed silica
description	The term “structuring” used in silicone rubber describes a phenomenon of the increase in the viscosity of polydimethylsiloxane filled with silica during storage, which limits the applications of the room temperature vulcanized (RTV) silicone rubber in the field of aerospace and military. In this pursuit, the present study was envisaged to solve the problem of structuring of the RTV. A solvent-free method was used to hydrophobize the hydrophilic silica with hexamethyldisilazane. An RTV composition prepared using eight parts of hydrophobic silica with 2.91% C content exhibited a viscosity of less than 100 Pa s, with no significant change in 21 days. In contrast, eight parts of the hydrophilic fumed silica showed an initial viscosity of RTV to be greater than 2,000 Pa s. Silica samples with different adsorbed water content were used to prepare the RTV compositions. It was found that the viscosity of the RTV prepared using the sufficiently dried silica was 5.6 times lower than that of the wet silica. The “dissolution” model of the silica–silica hydrogen bonds in water was proposed. Furthermore, the change in the viscosity of the RTV compositions at different temperatures in the range of −15°C to 30°C was studied. The viscosity of RTV stored at –15°C for 34 days did not change significantly, whereas that stored at room temperature increased from 100 to 1,710 Pa s within 21 days.
format	article
author	Peng Zhengwei Qin Yan Song Jiuqiang Zhu Di Chen Shuisheng Ren Jingwen Li ZhuangZhuang Zou Zhenyue
author_facet	Peng Zhengwei Qin Yan Song Jiuqiang Zhu Di Chen Shuisheng Ren Jingwen Li ZhuangZhuang Zou Zhenyue
author_sort	Peng Zhengwei
title	Structuring of hydroxy-terminated polydimethylsiloxane filled by fumed silica
title_short	Structuring of hydroxy-terminated polydimethylsiloxane filled by fumed silica
title_full	Structuring of hydroxy-terminated polydimethylsiloxane filled by fumed silica
title_fullStr	Structuring of hydroxy-terminated polydimethylsiloxane filled by fumed silica
title_full_unstemmed	Structuring of hydroxy-terminated polydimethylsiloxane filled by fumed silica
title_sort	structuring of hydroxy-terminated polydimethylsiloxane filled by fumed silica
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/73b7d618556b41bb9f931380737bd680
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Structuring of hydroxy-terminated polydimethylsiloxane filled by fumed silica

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