采用同步法合成聚氨酯/环氧树脂互穿网络硬泡,通过FTIR和SEM研究其化学结构及微观结构形态,为研究其压缩响应及变形模式,对其进行静态压缩试验.结果表明:IPN硬泡的压缩行为表现出各向异性.平行发泡方向的压缩应力-应变曲线表现出三个变形阶段,其中平台阶段的显著特征是应变软化和局部变形.垂直发泡方向的压缩曲线则单调增加,平台阶段没有产生应变软化,整个压缩过程中试样变形均匀分布.IPN硬泡的静态压缩存在明显的应变率效应,环氧树脂含量对压缩性能影响显著.描述IPN硬泡压缩局部变形理论模型,变形带厚度和变形带前沿传播速度的理论值与试验值吻合较好,采用该模型分析研究IPN硬泡的压缩变形机理.
A series of rigid polyurethane/epoxy resin interpenetrating polymer networks (PU/ER IPN) foams were prepared by a simultaneous polymerization technique.The chemical structure and morphology of these foams were investigated by fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM).The compression responses of the IPN foams are anisotropic.Compression in the rising direction yields a typical three-stage stress-strain response of foams, and the prominent features are strain-softening and deformation localization.Compression in the transversal direction gives rise to a monotonously increasing stress-strain curve without strain-softening and always produces uniformly distributed deformation.The results show that the compression behaviors of the IPN foams are sensitive to the strain rates and ER contents.A theoretical model, which could describe deformation localization of the foams, is referenced to calculate the deformation band parameters, and correlates well with experiments.The compression deformation mechanism of the IPN foams is analyzed by this model.
参考文献
| [1] | TU Z H;SHIM V P W;LIM C T .Plastic deformation modes in rigid polyurethane foam under static loading[J].International Journal of Solids and Structures,2001,38:9267-9279. |
| [2] | 林玉亮,卢芳云,王晓燕,赵习金.低密度聚氨酯泡沫压缩行为实验研究[J].高压物理学报,2006(01):88-92. |
| [3] | 卢子兴;田常津;谢若泽 .硬质聚氨酯泡沫塑料压缩力学性能[J].材料研究学报,1994,8(05):452-456. |
| [4] | Fabrice Saint-Michel;Laurent Chazeau;Jean-Yves Cavaille .Mechanical properties of high density polyurethane foams: I. Effect of the density[J].Composites science and technology,2006(15):2700-2708. |
| [5] | GIBSON L J;ASHBY M F .The mechanics of three-dimension cellular materials[J].Proceedings of Royal Society A,1982,382:43-59. |
| [6] | BREZNY R;GREEN D J .The effect of cell size on the mechanical behaviour of cellular materials[J].Acta Metallurgica Et Materialia,1990,38:2517-2526. |
| [7] | BASTAWROS A F;SMITH H F;EVANS A G .Experimental analysis of deformation mechanisms in a closed-cell aluminium alloy foam[J].Journal of the Mechanics and Physics of Solids,2000,48:301-322. |
| [8] | Cascaval CN.;Rosu D.;Rosu L.;Ciobanu C. .Thermal degradation of semi-interpenetrating polymer networks based on polyurethane and epoxy maleate of bisphenol A[J].Polymer Testing,2003(1):45-49. |
| [9] | 尚蕾,黄奕刚,王建华,贾晓蓉.聚氨酯/环氧树脂互穿网络聚合物的性能研究[J].化学研究与应用,2005(04):552-553. |
| [10] | 秦川丽,蔡俊,唐冬雁,张巨生,蔡伟民.PU/VER IPN材料阻尼性能的研究[J].材料工程,2003(07):36-39,42. |
| [11] | Zhang Y.;Hourston DJ. .Rigid interpenetrating polymer network foams prepared from a rosin-based polyurethane and an epoxy resin[J].Journal of Applied Polymer Science,1998(2):271-281. |
| [12] | 杨宇润,陈永林,张志平,王得宁,胡春圃.聚氨酯/环氧树脂互穿网络硬质泡沫塑料反应过程和微观结构[J].功能高分子学报,2003(02):159-165. |
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