Soft polyurethane elastomers with adhesion properties based on palm olein and palm oil fatty acid methyl ester polyols

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• 作者：S. Mohd Norhisham^a ; T.I. Tuan Noor Maznee^a ; H. Nurul Ain^a ; P.P. Kosheela Devi^a ; A. Srihanum^a ; M.N. Norhayati^a ; S.K. Yeong^a ; A.H. Hazimah^a ; Christi M. Schiffman^b ; Aisa Sendijarevic^b ; Vahid Sendijarevic^b ; Ibrahim Sendijarevic^b ; ^{sendijarevic@troypolymers.com}
• 关键词：Polyurethane ; Pressure-sensitive ; Novel adhesives ; Structure property relations ; Renewable polymers
• 刊名：International Journal of Adhesion and Adhesives
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：73
• 期：Complete
• 页码：38-44
• 全文大小：861 K
• 卷排序：73

文摘

Soft polyurethane (PU) elastomers with >70% bio-based content and with properties characteristic of pressure sensitive adhesives were prepared from an equimolar ratio of a polyol derived from palm oil fatty acid methyl ester (PolyFAME-EG polyol) and palm olein polyols (Pioneer E-135 and Pioneer M-60) cured with 2,4′- and 4,4′- diphenylmethane diisocyanate isomeric mixture at isocyanate to hydroxyl equivalent weight ratio (Isocyanate Index) of 1.02 and 0.73. FTIR analyses of the resulting elastomers indicate high levels of free non-hydrogen bonded urethanes, indicating phase mixing of hard and soft segments, which explains the transparent nature of the elastomers. The physical properties of the elastomers were correlated with the cross-link density of the palm olein polyols and Isocyanate Index. Elastomers produced at an Isocyanate Index of 1.02 ranges in hardness from 21 to 67 Shore A which correlated with the average polyol functionality. However, at an Isocyanate Index of 0.72 the resulting elastomers were very soft with hardness ranging from 1 to 4 Shore A and with T-peel adhesion to polypropylene in the range from 2.27 to 1.98 N/25 mm. Based on these results, a polyurethane matrix with a high renewable content of palm oil polyols can be used as a platform for the development of transparent elastomers that can be used as soft energy-absorbing materials with potential use in pressure sensitive adhesives.