Probing the urea hard domain connectivity in segmented, non-chain extended polyureas using hydrogen-bond screening agents

被引：51

作者：

Das, Sudipto ^{[1
]}

Yilgor, Iskender ^{[2
]}

Yilgor, Emel ^{[2
]}

Wilkes, Garth L. ^{[1
]}

机构：

[1] Virginia Tech, Dept Chem Engn, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA

[2] Koc Univ, Dept Chem, Istanbul, Turkey

来源：

POLYMER | 2008年 / 49卷 / 01期

关键词：

hydrogen-bonding; polyurea; microphase;

D O I：

10.1016/j.polymer.2007.10.046

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The effects of long-range connectivity between urea hard domains on the microphase morphology and mechanical properties of novel, segmented, non-chain extended polyureas based on single isocyanate molecules were analyzed. This was achieved by systematic disruption of the intermolecular bidentate hydrogen bonding between the urea hard segments by the incorporation of a hydrogen bond screener, LiCl. A systematic decrease in the breadth of the service temperature window and. mechanical properties of the polyureas were observed in the presence of LiCl, due to the disruption of the long range connectivity between the hard segments. The above mentioned effects were also found to be dependent on the symmetry of the diisocyanate hard segments. (C) 2007 Published by Elsevier Ltd.

引用

页码：174 / 179

页数：6

共 20 条

[1] Hard segment connectivity in low molecular weight model 'trisegment' polyurethanes based on monols [J].

Aneja, A ;

Wilkes, GL .

POLYMER, 2004, 45 (03) :927-935

[2] Exploring urea phase connectivity in molded flexible polyurethane foam formulations using LiBr as a probe [J].

Aneja, A ;

Wilkes, GL ;

Yilgor, I ;

Yilgor, E ;

Yurtsever, E .

JOURNAL OF MACROMOLECULAR SCIENCE-PHYSICS, 2003, B42 (06) :1125-1139

[3] Influence of lithium chloride on the morphology of flexible slabstock polyurethane foams and their plaque counterparts [J].

Aneja, A ;

Wilkes, GL ;

Yurtsever, E ;

Yilgor, I .

POLYMER, 2003, 44 (03) :757-768

[4] Exploring macro- and microlevel connectivity of the urea phase in slabstock flexible polyurethane foam formulations using lithium chloride as a probe [J].

Aneja, A ;

Wilkes, GL .

POLYMER, 2002, 43 (20) :5551-5561

[5] VISCOELASTIC BEHAVIOR OF SEGMENTED ELASTOMERS [J].

COOPER, SL ;

TOBOLSKY, AV .

TEXTILE RESEARCH JOURNAL, 1966, 36 (09) :800-&

[6] Effect of symmetry and H-bond strength of hard segments on the structure-property relationships of segmented, nonchain extended polyurethanes and polyureas [J].

Das, Sudipto ;

Cox, David F. ;

Wilkes, Garth L. ;

Klinedinst, Derek B. ;

Yilgor, Iskender ;

Yilgor, Emel ;

Beyer, Frederick L. .

JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS, 2007, 46 (05) :853-875

[7] Structure-property relationships and melt rheology of segmented, non-chain extended polyureas: Effect of soft segment molecular weight [J].

Das, Sudipto ;

Yilgor, Iskender ;

Yilgor, Emel ;

Inci, Bora ;

Tezgel, Ozgul ;

Beyer, Frederick L. ;

Wilkes, Garth L. .

POLYMER, 2007, 48 (01) :290-301

[8] Surfactant level influences on structure and properties of flexible slabstock polyurethane foams [J].

Kaushiva, BD ;

McCartney, SR ;

Rossmy, GR ;

Wilkes, GL .

POLYMER, 2000, 41 (01) :285-310

[9] Structure -: Property behavior of new segmented polyurethanes and polyureas without use of chain extenders [J].

Klinedinst, DB ;

Yilgör, E ;

Yilgör, I ;

Beyer, FL ;

Sheth, JP ;

Wilkes, GL .

RUBBER CHEMISTRY AND TECHNOLOGY, 2005, 78 (05) :737-753

[10] Segmented copolymers of uniform tetra-amide units and poly(phenylene oxide): 2. Crystallisation behaviour [J].

Krijgsman, J ;

Feijen, J ;

Gaymans, RJ .

POLYMER, 2004, 45 (14) :4685-4691

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