Dynamic glass transition of filled polysiloxane upon electron irradiation
Source abstract
Abstract
The influence of radiation-induced crosslinking on the molecular mobility of a filled silicone elastomer near the glass transition (α-relaxation) was analyzed using broadband dielectric spectroscopy. Samples of the isolated polysiloxane matrix (neat) were also studied so as to assess the filler influence on the evolution of the α-relaxation. A slowing-down of the segmental dynamics was observed with increasing ionizing dose. It was ascribed to the relaxing dipoles losing degrees of freedom as a result of network stiffening. An enhancement of intermolecular coupling, associatedwith the cooperativity of the α-relaxation,was deduced fromthe dielectric analysis. Similar observations were made in the past with chemically crosslinked polysiloxanes. This study evidenced that even though the crosslinks formed upon chemical crosslinking (mainly Si\\CH2\\CH2\\Si) differ in nature from those formed upon irradiation (mainly SiO3 and SiO4), they affect the dynamic glass transition in a very similar way. The filler influence on the dynamic glass transition was also studied upon irradiation. One of the main outcomes of this study is the fading of the filler-related effect in themost irradiated samples: both the shape and dynamics of the α-relaxation were identical in the most highly irradiated neat and filled samples.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Glass properties and applications · Material Dynamics and Properties · Polymer Nanocomposites and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (46)
Show source-provided references
1. Inorganic fillers influence on the radiation-induced ageing of a space-used silicone elastomer10.1016/j.polymdegradstab.2016.03.010 ↗
2. Dielectric relaxation of polydimethylsiloxane10.1002/pol.1979.180170510 ↗
3. Broad-band dielectric spectroscopy on the molecular dynamics of bulk and adsorbed poly(dimethylsiloxane)10.1021/ma00057a015 ↗
4. Segmental relaxation in poly(dimethylsiloxane)10.1021/ma960045d ↗
5. Molecular dynamics in poly(methylphenylsiloxane) as studied by dielectric relaxation spectroscopy and quasielastic light scattering10.1021/ma00202a005 ↗
6. Effect of temperature and pressure on segmental relaxation in polymethylphenylsiloxane10.5254/1.3547790 ↗
7. Dielectric relaxation in polymer solids part 2: application of the new model to polyurethane systems10.1007/BF01410351 ↗
8. Influence of cross-linking on the segmental dynamics in model polymer networks10.1063/1.481809 ↗
9. Influence of crosslinking on the molecular relaxation of an amorphous copolymer near its glass-transition temperature10.1021/ma00084a010 ↗
10. Constraints on local segmental motion in poly(vinylethylene) networks10.1021/ma00093a027 ↗
11. Segmental relaxation in end-linked poly(dimethylsiloxane) networks10.1021/ma011678h ↗
12. Segmental dynamics in poly(methylphenylsiloxane) networks by dielectric relaxation spectroscopy10.1021/ma981937b ↗
13. Silicone sealants and structural adhesives10.1016/S0143-7496(01)00018-5 ↗
14. NMR study of the gamma radiolysis of poly(dimethyl siloxane) under vacuum at 303K10.1016/S0032-3861(01)00711-X ↗
15. Elastomeric composites. I. Silicone composites10.1002/app.20684 ↗
16. Comparative studies on effects of silica and titania nanoparticles on crystallization and complex segmental dynamics in poly(dimethylsiloxane)10.1016/j.polymer.2010.09.054 ↗
17. Current perspectives on silicone rubber technology10.5254/1.3535846 ↗
18. Material charging in space environment: experimental test simulation and induced conductive mechanisms10.1109/TDEI.2009.5128506 ↗
19. Dose effects in the crosslinking of irradiated polysiloxane
20. Synthesis, structure, and properties of hybrid organic-inorganic composites based on polysiloxanes. II. Comparisons between poly(methylphenylsiloxane) and poly(dimethylsiloxane), and between titania and silica10.1002/(SICI)1099-0488(199805)36:7<1191::AID-POLB8>3.0.CO;2-X ↗
21. A complex plane analysis of α-dispersions in some polymer systems10.1002/polc.5070140111 ↗
22. The law of the relation between the viscosity of liquids and the temperature
23. Analysis of the recent measurements of the viscosity of glasses10.1111/j.1151-2916.1925.tb16731.x ↗
24. Die abhängigkeit der viscosität von der temperatur bie unterkühlten flüssigkeiten10.1002/zaac.19261560121 ↗
25. On the temperature dependence of cooperative relaxation properties in glass-forming liquids10.1063/1.1696442 ↗
26. Universality of low-frequency fluctuation, dissipation, and relaxation properties of condensed matter. I, comments
27. Molecular transport in liquids and glasses10.1063/1.1730566 ↗
28. The scaling of the dynamics of glasses and supercooled liquids
29. Relaxation in glassforming liquids and amorphous solids10.1063/1.1286035 ↗
30. Relaxation in liquids, polymers and plastic crystals — strong/fragile patterns and problems10.1016/0022-3093(91)90266-9 ↗
31. Segmental relaxation and molecular structure in polybutadienes and polyisoprene10.1021/ma00019a016 ↗
32. Nonexponential relaxations in strong and fragile glass formers10.1063/1.466117 ↗
33. Molecular dynamics in polymer model systems
34. Effects of annealing and prior history on enthalpy relaxation in glassy polymers. 4. Comparison of five polymers10.1021/ma00240a013 ↗
35. Chemical structure and intermolecular cooperativity: dielectric relaxation results10.1021/ma00077a019 ↗
36. A cluster approach to the structure of imperfect materials and their relaxation spectroscopy
37. Dielectric relaxation in polymeric solids part 1. A new model for the interpretation of the shape of the dielectric relaxation function10.1007/BF01410350 ↗
38. Correlation of polymer segmental chain dynamics with temperature-dependent time-scale shifts10.1021/ma00005a044 ↗
39. Role of chemical structure in fragility of polymers: a qualitative picture10.1021/ma801155c ↗
40. The size of cooperatively rearranging regions at the glass transition10.1016/0022-3093(82)90089-8 ↗
41. Changes in silicone polymeric fluids due to high-energy radiation
42. Gamma irradiation of silicones10.1007/s10904-008-9205-0 ↗
43. The viscoelastic behaviour of networks10.1016/S1089-3156(97)00016-0 ↗
44. Self-similarity of dielectric relaxation and conductivity in cross-linking systems10.1103/PhysRevB.53.564 ↗
45. Temperature modulated calorimetry and dielectric spectroscopy in the glass transition region of polymers10.1007/BF01983612 ↗
46. Glass transition and segmental dynamics in poly(dimethylsiloxane)/silica nanocomposites studied by various techniques10.1016/j.jnoncrysol.2007.05.183 ↗