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Synthesis, Structure and Properties of Pui

Author: YangXiaoHui
Tutor: LiuYunHang
School: Shanghai Jiaotong University
Course: Chemical Engineering
Keywords: PUI Elastomers Properties Copolymerization Chain Extender Double-amino Endcapped Amido Acid Double-amino Endcapped Imide Microphase Separation Crystallinity Hydrogen Bond
CLC: TQ334.1
Type: Master's thesis
Year: 2009
Downloads: 47
Quote: 0
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Abstract


Polyurethane Elastomers (PUE) have a good resistance to wear, fatigue, chemicals and impact, which are widely used as engineering materials. However, the traditional PUs have weak heat tolerance thus limit its further application in engineering technology.Using copolymerization to introduce heat resistant group and rigid group into main chain of PU is an important method to improve PUE thermal and mechanic properties. In this paper, PU was modified by changing hard segment. Two kinds of heterocyclic chain extender were synthesized one is double-amino endcapped amido acid, the other is double-amino endcapped imide. Use FTIR, EA to confirm the structure. A series of modified PUE were prepared and use FTIR, WAXRD, DSC, TGA, DMA, AFM and mechanical test to research its structure and properties. The results showed that the thermal and tensile properties of imide-ring containing PUE are better than the traditional MOCA extended ones, this suggest that the introducing of aromatic imide ring improve the thermal and mechanical properties of PUE. In addition, the degree of phase separation and crystallinity in the imide-ring containing PUE is higher than the traditional PU, this may due to that the imide ring increase the polarity and hydrogen bond degree in hard segment.

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CLC: > Industrial Technology > Chemical Industry > Rubber Industry > Thermoplastic elastomers > Polyester elastomer
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