ISSN:
1572-8935
Keywords:
Phenylphosphonate-thiodiphenol epoxy resin
;
Relaxation
;
Glass transition
;
TSC/RMA
;
Entropy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract TSC/RMA study on the depolarization relaxation transitions of the phenylphosphonate-modified epoxy copolymers with thiodiphenol (P2-ETP) or bis-phenol A (P2-EBPA) segments were conducted. P2-ETP resin shows a lower Tg than that of P2-EBPA, indicating that divalent thio-linkage (-S-) is flexible than isopropyl (-C(CH3)2-) group. Thermal windowing technique of RMA was used to obtain thermokinetic data in which ΔS of P2-ETP is higher than P2-EBPA, thus confirms the easier motion in P2-ETP which then leads to the lowering of the glass transition (Tg). Methods used for the confirmation on the Tg temperature were illustrated from thermokinetic data obtained by RMA measurement.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s10965-006-0065-4
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