Effect of the Repeated Unit Length of Guest Polymers on the Molecular Motion of Polymer Blends within a Miscible Window

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Title:	Effect of the Repeated Unit Length of Guest Polymers on the Molecular Motion of Polymer Blends within a Miscible Window
Authors:	洪耀釧;Albert, Y.C.Hung
Contributors:	保健營養生技學系
Keywords:	blends;molecular motion;NMR;thermogravimetric analysis;thermodynamic
Date:	2003-02
Issue Date:	2012-11-26 02:31:11 (UTC+0)
Abstract:	The effect of the repeated unit length on the substantially increasing molecular motion and entropy change (−TΔSm) of polymer blends was investigated with solid-state 13C NMR and differential scanning calorimetry within a miscible window. The hydrogen-bonding strength, from the formation of the phenolic–polyester interaction, was not high enough to overcome the breaking-off of the self-association of the phenolic. With respect to the increasing repeated unit length, the polyester resonance intensity of the solid-state 13C NMR spectra was weakened because of the reduction in the cross-polarization efficiency in highly mobile samples. The glass-transition temperature of the blend and the proton spin–lattice relaxation time from NMR experiments were also reduced. The effect of the reduced hydrogen-bonding strength on blending brought about a tendency of higher entropy (−TΔSm) and higher molecular mobility of the blend. Accordingly, poly(decamethylene adipate) possessed the longest repeated unit length and exhibited the most mobile one in this phenolic/polyester blend family. The molecular segmental motion and entropy progressively increased while the repeated unit length of the guest polymers increased within a miscible window. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 679–686, 2003
Relation:	JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 41(7):679-686.
Appears in Collections:	[食品營養與保健生技學系] 期刊論文

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