Influence of the chemical structure of PUR prepolymers on thermal stability

被引：44

作者：

Clauss, Sebastian ^{[1
]}

Dijkstra, Dirk J. ^{[2
]}

Gabriel, Joseph ^{[3
]}

Klaeusler, Oliver ^{[1
]}

Matner, Mathias ^{[2
]}

Meckel, Walter ^{[3
]}

Niemz, Peter ^{[1
]}

机构：

[1] ETH, Inst Bldg Mat, CH-8093 Zurich, Switzerland

[2] Bayer Mat Sci AG, Coatings Adhes & Specialties, D-51373 Leverkusen, Germany

[3] Purbond AG, CH-6203 Sempach, Switzerland

来源：

INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES | 2011年 / 31卷 / 06期

关键词：

Dynamic mechanical analysis; Lap-shear; Polyurethane; Adhesives for wood; Thermal stability; COMPONENT POLYURETHANE ADHESIVES; WOOD; TEMPERATURE; MOISTURE; BEHAVIOR; CREEP;

D O I：

10.1016/j.ijadhadh.2011.05.005

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The thermal stability of adhesives for load-bearing construction has been one of their key parameters since engineered wood products were introduced in timber construction. In the case of one-component moisture-curing polyurethane (1C PUR) adhesives, knowledge about relationships between their chemical structure and the resulting bonding properties is limited, especially under high-temperature conditions. In this study the structure-property relationships of 1C PUR prepolymers were analyzed in the temperature range from 20 to 200 degrees C by means of mechanical and rheological tests. NCO-terminated urethane prepolymers were prepared from systematically varied MDI and polyether mixtures. The structural parameters investigated were the urea and urethane group content, cross-link density, ethylene oxide content and the adjustment of functionality via NCO or polyether component. Bonded wood joints were tested for their tensile shear strength and polymer films were analyzed by means of DMA and DSC. The results revealed a significant influence of hard segment content and cross-link density on the thermal stability of the prepolymers. Not all parameters that affect the film properties significantly influence bonding. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：513 / 523

页数：11

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