围绕利用聚烯烃软段设计制备高性能聚氨酯(PU)的思路,分别采用聚丁二烯(HTPB)及氢化聚丁二烯(H-HTPB)为软段合成了PU,在120℃下进行加速热氧老化实验,详细研究材料的老化机理与性能。结果表明:含H-HTPB软段的PU在外观、表面平整度、力学性能等方面均表现出较强的抗老化性,在老化后综合力学性能较好,韧性较高,加速老化120h后断裂伸长率仍达252.5%±18.5%。为构建高性能抗老化型PU提供了重要的优选思路与方法。
Followed the idea of design and preparation of polyurethane (PU) with high performances by using the soft segment of polyolefin,PU was synthesized with polybutadiene (HTPB) and hydrogenated polybutadiene (H-HTPB) respectively as soft segments,and then accelerated thermal oxidative aging was carried out at 120℃ to evaluate the aging mechanism and properties of these materials.PU with H-HTPB as the soft segment shown strong aging resistance in many aspects such as appearance,surface smoothness and mechanical properties.After aging,it still owned good comprehensive mechanical properties and high toughness.After aging at 120h,the elongation was up to 252.5%+18.5%.This research provided an important optimization idea and method to construct PU with high-performances and anti-aging.
[1] Oertel G.Polyurethane handbook[M] Munich:Hanser Publishers 2nd Edn,1993,1-25.
[2] Oprea S,Vlad S.Evaluation of physico-mechanical properties of precipitated polyurethane films in medium of free radical agents[J].European Polymer Journal,2002,38(7):1465-1470.
[3] Oprea S,Oprea V.Mechanical behavior during different weathering tests of the polyurethane and elastomers films[J].European Polymer Journal,2002,38(6):1205-1210.
[4] Zhou R,Lu D H,Jiang Y H,et al.Mechanical properties and erosion wear resistance of polyurethane matrix composites[J].Wear,2005,259(1):676-683.
[5] Rek V,Bravar M,Jocić T.Ageing of solid polyester-based polyurethane[J].Journal of Elastomers & Plastics,1984,16(4):256-264.
[6] Sardon H,Chan J M W,Ono R J,et al.Highly tunable polyurethanes:organocatalyzed polyaddition and subsequent post-polymerization modification of pentafluorophenyl ester sidechains[J].Polymer Chemistry,2014,5(11):3547-3550.
[7] Dolmaire N,Méchin F,Espuche E.Water transport in polyurethane/polydimethylsiloxane membranes:influence of the hydrophobic/hydrophilic balance and of the crosslink density[J].Desalination,2006,199(1):118-120.
[8] Jašo V,Rodić M V,Petrović Z S.Biocompatible fibers from thermoplastic polyurethane reinforced with polylactic acid microfibers[J].European Polymer Journal,2015,63:20-28.
[9] Yilgor I,Yilgor E,Guler I G,et al.FT-IR investigation of the influence of diisocyanate symmetry on the morphology development in model segmented polyurethanes[J].Polymer,2006,47(11):4105-4114.
[10] Akbas A,Aksoy S,Hasirci N.Effects of thermal aging on the properties and lifetimes prediction of hydroxyl-terminated polybutadiene[J].Polymer,1994,35(12):2568-2572.
[11] 杨慧,王相鹏,郑津,等.热塑性聚氨酯弹性体的老化机理[J].厦门大学学报(自然科学版),2017,56(3):370-377.
基金资助
科技部-国家重点研发计划(2017YFE0102300);国家自然科学基金(51503218);宁波市自然科学基金(2018A610034)
PDF
(3772KB)
