The thermal degradation of polysiloxanes—II. Poly(methylphenylsiloxane)

Grassië, N.; Macfarlane, I.G.; Francey, K.F.

doi:10.1016/0014-3057(79)90053-3

Cited by 113 publications

(46 citation statements)

References 9 publications

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“…H vs. Y crosslinking via varying free radical mechanisms), bonding to the filler matrix, etc. [1][2][3][4][6][7][8][9][10][11][12][13][14][15] For both thermally and radiation induced degradation multiple, competing reaction pathways can exist and occur simultaneously to varying extent dependent on variables such as total input energy, monomer types (i.e. stabilizing phenyl groups), additives (fillers, stabilizers, etc.…”

Section: Spectrometry (Gc/ms) the Mechanical Data Andmentioning

confidence: 99%

MQ NMR and SPME Analysis of Nonlinearity in the Degradation of a Filled Silicone Elastomer

et al. 2010

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Radiation-induced degradation of polymeric materials occurs through numerous, simultaneous, competing chemical reactions. Although degradation is typically found to be linear in adsorbed dose, some silicone materials exhibit nonlinear dose dependence due to dose-dependent dominant degradation pathways. We have characterized the effects of radiative and thermal degradation on a model filled-PDMS system, Sylgard 184 (commonly used in electronic encapsulation and in biomedical applications), using traditional mechanical testing, NMR spectroscopy, and sample headspace analysis using solid-phase microextraction (SPME) followed by gas chromatography/mass spectrometry (GC/MS). The mechanical data and 1H spin−echo NMR spectra indicated that radiation exposure leads to predominantly cross-linking over the cumulative dose range studied (0−250 kGy) with a rate roughly linear with dose. 1H multiple-quantum NMR spectroscopy detected a bimodal distribution in the network structure, as expected from the proposed structure of Sylgard 184. The MQ NMR spectra further indicated that the radiation-induced structural changes were not linear in adsorbed dose and that competing chain scission mechanisms made a greater contribution to the overall degradation process in the range of 50−100 kGy (although cross-linking still dominated). The SPME−GC/MS data were analyzed using principal component analysis (PCA), which identified subtle changes in the distributions of degradation products (the cyclic siloxanes and other components of the material) as a function of age that provide insight into the dominant degradation pathways at low and high adsorbed dose.

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Section: Spectrometry (Gc/ms) the Mechanical Data Andmentioning

confidence: 99%

MQ NMR and SPME Analysis of Nonlinearity in the Degradation of a Filled Silicone Elastomer

et al. 2010

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“…For the same chemical class, the method of adiabatic compression is used to avoid the thermal degradation at hot surfaces [22]. Thermogravimetric analyses within vacuum [23][24][25][26] as well as the analysis of different catalysts [27] are also widespread. A test rig designed especially for measurements of ORC working fluids, and in particular of methylbenzenes, is reported by Angelino et al [28].…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability of Hexamethyldisiloxane (MM) for High-Temperature Organic Rankine Cycle (ORC)

Preißinger

Brüggemann

2016

Energies

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“…Using the same analytical approach for the studies of gaseous products formed on thermal immobilization of silanol-terminated silicones, Welsch et al found that substantial amounts of methane were formed from dimethylsilicones and that benzene was formed from phenylcontaining silicones (47). Grassie et al also have shown that benzene is formed upon heat treatment of silanol-terminated, phenyl-substituted silicones (48)(49)(50). A mechanism for the formation of chain branching was suggested (48):…”

Section: Thermal Immobilizationmentioning

confidence: 97%

Current aspects of stationary phase immobilization in open tubular column chromatography

Blomberg

1990

J Microcolumn Separations

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Abstract. In situ stationary phase immobilization in principle can be attempted in two different ways: using thermal methods or radical-initiated reactions. Thermal immobilization, in general, is applied for the preparation of columns to be used at ultrahigh temperatures, and radical-initiated immobilization can be applied in most other cases. For polar, narrow-bore. and thick-film columns. low immobilization temperatures are preferred. The reactions involved in the different immobilization methods are described in this review, and the advantages and disadvantages of current immobilization methods are discussed.

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The thermal degradation of polysiloxanes—II. Poly(methylphenylsiloxane)

Cited by 113 publications

References 9 publications

MQ NMR and SPME Analysis of Nonlinearity in the Degradation of a Filled Silicone Elastomer

MQ NMR and SPME Analysis of Nonlinearity in the Degradation of a Filled Silicone Elastomer

Thermal Stability of Hexamethyldisiloxane (MM) for High-Temperature Organic Rankine Cycle (ORC)

Current aspects of stationary phase immobilization in open tubular column chromatography

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