The action of heat on the polyorganosiloxanes derived from the minerals biotite and pseudowollastonite by trimethylsilylation
The polyorganosiloxanes prepared by the trimethylsilylation of mineral silicates contain Q [SiO4/2] units and M [CH3)3 SiO1/2] units. Investigations into the behaviour of these materials in the temperature range 100‐1000°C and for times varying from 2‐64 hours have shown that a variety of reactions...
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| Veröffentlicht in: | British polymer journal 1979-12, Vol.11 (4), p.178-181 |
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| container_title | British polymer journal |
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| creator | Cook, Colin B. Currell, Brian R. Midgley, Henry G. Parsonage, John R. Thakur, Chandra P. |
| description | The polyorganosiloxanes prepared by the trimethylsilylation of mineral silicates contain Q [SiO4/2] units and M [CH3)3 SiO1/2] units. Investigations into the behaviour of these materials in the temperature range 100‐1000°C and for times varying from 2‐64 hours have shown that a variety of reactions take place with a general increase in number average molecular weight (Mn). Organophilic polyorganosiloxanes with Mn > 6000 can be obtained by heat treatment under vacuum or a stream of nitrogen. The thermal stability of the polymer derived from pseudowollastonite in closed systems in the presence of acid/base catalysts is also reported. This work is part of a general programme to prepare higher molecular weight Q/M polymers with more potential uses as industrial materials than the initially prepared trimethylsilylated derivatives. |
| doi_str_mv | 10.1002/pi.4980110403 |
| format | Article |
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Investigations into the behaviour of these materials in the temperature range 100‐1000°C and for times varying from 2‐64 hours have shown that a variety of reactions take place with a general increase in number average molecular weight (Mn). Organophilic polyorganosiloxanes with Mn > 6000 can be obtained by heat treatment under vacuum or a stream of nitrogen. The thermal stability of the polymer derived from pseudowollastonite in closed systems in the presence of acid/base catalysts is also reported. 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Poly. J</addtitle><date>1979-12</date><risdate>1979</risdate><volume>11</volume><issue>4</issue><spage>178</spage><epage>181</epage><pages>178-181</pages><issn>0007-1641</issn><eissn>1934-256X</eissn><abstract>The polyorganosiloxanes prepared by the trimethylsilylation of mineral silicates contain Q [SiO4/2] units and M [CH3)3 SiO1/2] units. Investigations into the behaviour of these materials in the temperature range 100‐1000°C and for times varying from 2‐64 hours have shown that a variety of reactions take place with a general increase in number average molecular weight (Mn). Organophilic polyorganosiloxanes with Mn > 6000 can be obtained by heat treatment under vacuum or a stream of nitrogen. The thermal stability of the polymer derived from pseudowollastonite in closed systems in the presence of acid/base catalysts is also reported. This work is part of a general programme to prepare higher molecular weight Q/M polymers with more potential uses as industrial materials than the initially prepared trimethylsilylated derivatives.</abstract><cop>Essex</cop><pub>John Wiley & Sons, Ltd</pub><doi>10.1002/pi.4980110403</doi><tpages>4</tpages></addata></record> |
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| ispartof | British polymer journal, 1979-12, Vol.11 (4), p.178-181 |
| issn | 0007-1641 1934-256X |
| language | eng |
| recordid | cdi_crossref_primary_10_1002_pi_4980110403 |
| source | Wiley Online Library Journals Frontfile Complete |
| title | The action of heat on the polyorganosiloxanes derived from the minerals biotite and pseudowollastonite by trimethylsilylation |
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