CAJ | 학술논문

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.
채용동보법합성취안지/배양수지호천망락경포,통과FTIR화SEM연구기화학결구급미관결구형태,위연구기압축향응급변형모식,대기진행정태압축시험.결과표명:IPN경포적압축행위표현출각향이성.평행발포방향적압축응력-응변곡선표현출삼개변형계단,기중평태계단적현저특정시응변연화화국부변형.수직발포방향적압축곡선칙단조증가,평태계단몰유산생응변연화,정개압축과정중시양변형균균분포.IPN경포적정태압축존재명현적응변솔효응,배양수지함량대압축성능영향현저.묘술IPN경포압축국부변형이론모형,변형대후도화변형대전연전파속도적이론치여시험치문합교호,채용해모형분석연구IPN경포적압축변형궤리.
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.