Free-volume, Microstructure and Solvent Diffusion Behavior of Polyolefine Based Polyurethane Studied by Positron Annihilation Lifetime Spectroscopy

Abstract

Abstract: A series of polyurethane(PU) films made from TDI, 1,4-BDO and hydroxyl-terminated polybutadiene(HTPB) or hydroxy-terminated polybutadiene/acrylonitrile(HTBN) was synthesized by solution polymerization. Positron annihilation lifetime(PAL) spectroscopy and DSC were applied to investigate their free volume and morphology. The free volume fraction(f_v) decreased with the increase of hard segment content. The HTBN based PUs showed smaller values of f_v, which may be attributed to its lower degree of microphase separation, while the HTPB based PUs were antithetical. Sorption experiments showed that the diffusion coefficients(D₀) of the "infinitely diluted" benzene and ethanol vapor through the PU film exhibited positive correlation with free volume fraction, but did not fit to the Fujita free-volume theory, which might be attributed to the ethanol and benzene having complicated effect of swelling.

Key words: Positron annihilation lifetime spectroscopy, Polyolefin based polyurethane, Solvent, Diffusion, Micro phase separation

CLC Number:

O631.4

TrendMD:

YANG Yu-Run, WANG Zhi-Fen, CHEN Yong-Lin, WANG De-Ning, HU Chun-Pu, WANG Bo. Free-volume, Microstructure and Solvent Diffusion Behavior of Polyolefine Based Polyurethane Studied by Positron Annihilation Lifetime Spectroscopy[J]. Chem. J. Chinese Universities, 2005, 26(4): 782.

References

[1] Aminabhavi T.M.,Khinnavar R.S..Polymer[J],1993,34(5):1006—1018 [2] Aithal U.S.,Aminabhavi T.M..J.Memb r.Sc.i[J],1990,50:225—247 [3] Aithal U.S.,Aminabhavi T.M..Polym.Preprints[J],1989,30(1):17—19 [4] Aithal U.S.,Aminabhavi T.M..J.Appl.Polym.Sc.i[J],1991,42:2837—2844 [5] Aithal U.S.,Aminabhavi T.M.,Balundgi R.H.etal..J.Macromol.Sc.iRev.Macromol.Chem.Phys.[J],1990,C30(1):43—105 [6] Landro L.D.,Pegoraro M.,Bordogna L..J.Memb r.Sc.i[J],1991,64:229—239 [7] Grabczyk A.W.,Smigasiewicz S.,Muszynski J..Polym.Bull.[J],1998,40:591—598 [8] Ponangi R.,Pintauro P.N..J.Memb r.Sc.i[J],1998,144:25—35 [9] Gou M.M.,Koros W.J.,Goldman G.W..J.Appl.Polym.Sc.i[J],1991,43:1991—1998 [10] Fujita H..Fortschr.Hochpolym.Forsch.[J],1961,3:1—47 [11] Lee W.M..Polym.Eng.Sci.[J],1980,20:65—69 [12] Kluin J.E.,Yu Z.,Vleeshouwers S.etal..Macromolecules[J],1993,26:1853—1861 [13] Xie L.,Gidley D.W.,Hristov H.A.etal..J.Polym.Sci:PartB,Polym.Phy.[J],1995,33:77—84 [14] Hong X.,Yang H.,Jordan S.S.etal..Macromolecules[J],1996,29:7859—7864 [15] Jean Y.C.,Yuan J.P.,Liu J.etal..J.Polym.Sci.PartB,Polym.Phy.[J],1995,33:2365—2371 [16] Yang H.,Jean Y.C..Materials Science Forum[J],1997,255—257:40—45 [17] Yuan Y.P.,Cao H.,Hong X.etal..Materials Science Forum[J],1997,255—257:390—392 [18] YANG Yu-Run(杨宇润),CHEN Yong-Lin(陈永林),WANG De-Ning(王得宁)etal..Acta Polymerica Sinica(高分子学报)[J],2002,6:795—802 [19] LI Jun,XU Zhen-Liang,LIU Hong-La.iChinese J.of Chem.Eng.[J],1997,48(5):517—521 [20] Kirkegaard P.,Eldrup M.,Mogensen O..Comp.Phys.Comm.[J],1981,23:307—319 [21] HE Chun-Qing(何春清),DAI Yi-Qun(戴益群),ZHANG Shao-Ping(张少平)etal..J.Wuhan University(Natural ScienceEdition)[武汉大学学报(自然科学版)][J],2000,46(1):63—66 [22] Fox T.G..Bull.Am.Phys.Soc.[J],1956,1:123—135 [23] Cuve L.,Pascault J.P.,Boiteux G.etal..Polymer[J],1991,32(2):343—352 [24] Liu J.,Jean Y.C..Macromolecules[J],1995,28:5774—5779 [25] Huang Y.M.,Liu H.L.,Hu Y..J.Memb r.Sc.i[J],2003,222:123—132 [26] Jean Y.C..Microchem.J.[J],1990,42:72—102