Relationship between morphology, properties and degradation parameters of?novative biobased thermoplastic polyurethanes obtained from dimer fatty acids

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• 作者：Carmen Bueno-Ferrer ; Elodie Hablot ; Mar¨ªa del Carmen Garrig¨®s ; Sergio Bocchini ; Luc Averous ; Alfonso Jim¨¦nez
• 关键词：Dimer fatty acid ; Biobased polyol ; Thermoplastic polyurethane ; Degradation parameters ; Mechanical properties
• 刊名：Polymer Degradation and Stability
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：97
• 期：10
• 页码：1964-1969
• 全文大小：459 K

文摘

Biobased thermoplastic polyurethanes (TPUs) obtained from dimer acid-based polyols, 4,4¡ä-diphenylmethane diisocyanate and 1,4-butanediol were synthesised by using a two-step prepolymer process. The effect of dimer acid-based polyols on the processing parameters was investigated. A full thermal, mechanical and thermo-mechanical characterisation of TPUs synthesised with different hard segment (HS) contents was also carried out. Thermogravimetric analysis showed the presence of three degradation steps which varied between the different TPU structures depending on the HS content. Colour tests showed substantial differences between TPU samples which were related to degradation parameters. Initial degradation temperatures were lower than the polyol's one and decreased with increasing HS contents. Tensile tests showed high deformation at break for these elastomeric TPU samples, except for the sample with 40?wt % of HS. Finally, rheology studies revealed that the melting temperature generally decreased with higher HS contents.