NDLI: Thermally stimulated current study on flexible siloxane-modified epoxy sheets

Content Provider	Springer Nature Link
Author	Lo, Tun Yuan Shau, Wei Chin Huang, Steve K.
Copyright Year	1997
Abstract	Copolymers prepared from the epoxy resin of ALBIFLEX and PMPS oligomer were evaluated with IR, $^{1}$H-and $^{13}$C NMRs for structural determinations. The flexible epoxy resin as a model compound was examined by TSC with variations on the operational parameters t$_{p}$ and V$_{p}$. Transitions denoted as T$_{g,δ}$, T$_{g,γ}$, T$_{g,β}$, T$_{g,α}$ and T$_{g,ρ}$ in increasing order of temperature were observed for these copolymers. As an example, ESAF-7430 copolymer showed these transitions at −138, −84, 26, 87, and 110 °C, respectively. Each transition except the T$_{g,ρ}$ at 110 °C, has been correlated to a segment in the copolymeric structure. The result indicates that TSC provides clear molecular transitions at the temperature of the transition. The molecular transition of the grafted PMPS-siloxane segment in an epoxy matrix appeared at the −45 °C region as a broad, nearly flat peak as it filled the concave part of the TSC curve of the unmodified resin. The flexibility that the modified copolymers retained may be attributed to these sub-T$_{g}$ transitions as observed in the TSC spectrum.
Starting Page	73
Ending Page	80
Page Count	8
File Format	PDF
ISSN	10229760
Journal	Journal of Polymer Research
Volume Number	4
Issue Number	2
e-ISSN	15728935
Language	English
Publisher	Kluwer Academic Publishers-Consultants Bureau
Publisher Date	1997-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	TSC Flexible siloxane-epoxy resin Relaxation transition T$_{g}$ Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation Materials
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Materials Chemistry Polymers and Plastics

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