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《Synthtrc Rubber Industry》 1991-03
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HYDROGEN BONDS IN POLYURETHANE ELASTOMERS

Liu Shu (Shanxi Provincial Research Institute of Chemical Industry , Taiyuan )  
The formation of hydrogen bonds in polyurethane elastomers (PU)and its effect on the properties of PU were reviewed with 21 references . About 75%- 95% of NH groups in PU formed hydrogen bonds among which about 60% of hydrogen bonds were distributed among the hard segments ,and 15%- 35% of hydrogen bonds were distributed between the hard and soft segments . The molecular structure and temperature were the major factors which influenced the formation of hydrogen bonds . With the formation of hydrogen bonds in PU , both the glass transition temperature of soft segment phase and the thermal stability of hard segment phase increased , while the modulus , extent of orientation and residual orientation of PU decreased . The Permanent deformation , mechanical hysteresis and stress softening of PU were also reduced .
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