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Citation: WANG Ping-Hua, WU Sheng-Li, WANG Wen-Ping, WANG Weng-Ying, HUANG Lu. Influence of PNA and 1,2-PG on the Microphase Structure and Properties of Polyurethane Adhesives[J]. Chinese Journal of Applied Chemistry, ;2005, 22(10): 1141-1144. shu

Influence of PNA and 1,2-PG on the Microphase Structure and Properties of Polyurethane Adhesives

1.
Department of Polymer Science and Engineering, Hefei University of Technology, Hefei 230009

Corresponding author: WANG Ping-Hua,
Received Date: 20 November 2004
Available Online: 17 May 2005

A series of polyurethane adhesives were prepared by using MDI-BDO as the hard-segment and PBA as the soft-segment.In order to control the crystallinity of the hard and soft segments,1,2-PG and PNA,which contain dissymmetrical and symmetrical side methyl groups respectively,were incorporated into the hard-segment and the soft-segment respectively.The influences of the changes of the soft-segment and the hard-segment structures and their contents on the crystallinity,micro-phase separation,mechanical properties and adhesive strength were studied by DSC,WAXD,and SEM.The results show that the introduction of PNA reduced the crystallinity of the soft-and the hard-segment simultaneously,and increased the micro-phase separation.The crystallinity and micro-phase separation of the hard-segments decreased upon the introduction of 1,2-PG,and the tensile strength decreased with the increased content of 1,2-PG;however,the adhesive strength increased from 16.8 N/cm to 18.1 N/cm.When the hard-segment content increased from 23% to 31%,the tensile strength of polyurethane adhesive was enhanced from 25.6 MPa to 37.1 MPa,but the elasticity declined.
- polyurethane adhesive,
- crystallinity,
- micro-phase separation,
- soft-segment,
- hard-segment
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