一、性能简介
聚甲基丙烯酰亚胺（PMI）泡沫是高性能、高质量的结构泡沫材料，用作高性能复合材料芯材，可以简化工艺、缩短流程，并解决蜂窝芯材所面临的孔格粗、易吸潮、易脱粘的问题，解决一般泡沫芯材比强度低、比模量低、耐热性低的问题。
PMI泡沫的性能优点在于:
高力学性能:具有高比强度、高比模量，其拉伸、压缩、弯曲、剪切等各项强度和模量均远优于PVC、PU、PET等其他泡沫或轻木芯材，且各向同性，可提高强度、改进刚性、减轻重量。
高耐热性能:具有独特的交联结构、酰亚胺环结构，高温稳定性和耐压性好，热变形温度200℃以上，适应高温模压或真空热压罐共固化成型工艺，缩短工艺时间、提高生产效率、改进结构性能。
高闭孔率:闭孔率95%～98%，用于复合夹芯结构，可以避免蜂窝芯材可能出现的吸潮、脱胶问题，改进安全性能、延长使用寿命。由于其高闭孔率和抗水压性能，可以用作水下浮力材料。
阻隔性能:由于其高闭孔率与细密均匀的泡孔，使材料具有良好的隔音、隔热、隔潮性能。
易于粘接:适应环氧、不饱和聚酯等各种树脂体系，粘接强度高。
加工便利性:便于机械加工，并可以在加热条件下弯曲成型为各种曲面，提高了设计自由度。
耐疲劳性:独特的分子结构赋予其良好的耐疲劳性能，特别适用于承受动态载荷的复合夹层结构。
铝当量及介电透波性:铝当量低，适用于医疗器械行业。在广泛的频率范围内具有低介电常数、低介质损耗，具有良好的电绝缘性，适用于雷达装备。
High performance polymethylacryimide (PMI) foam
I. Introduction to performance
Poly (methyl acrylic imide (PMI) foam is the structure of high performance, high quality foam material, used for high performance composite core material, can simplify the process, shorten the process, and solve the honeycomb core material of perforated thick, easy to moisture absorption, easy debonding problem, solve the general low foam core material is better than strength, the problem of lower than the low modulus, heat resistance.
The performance advantages of PMI bubbles are:
High mechanical properties: with high specific strength, high specific modulus, tensile, compression, bending, shearing strength and modulus are far better than PVC, PU, PET and other foam or balsa wood core material, and isotropic, can improve strength, improve rigidity, reduce weight.
High heat resistance: with unique cross-linked structure, imide ring structure, high temperature stability and good pressure resistance, hot deformation temperature of 200℃ or more, adapt to high temperature molding or vacuum autoclaved co-curing molding process, shorten the process time, improve production efficiency, improve structural performance.
High closed cell rate: closed cell rate of 95% ~ 98%, used for composite sandwich structure, can avoid the honeycomb core material may appear moisture absorption, degum problems, improve safety performance, prolong service life. Because of its high closed cell ratio and hydraulic resistance, it can be used as an underwater buoyancy material.
Barrier performance: because of its high closed cell ratio and fine and uniform bubble, the material has good sound insulation, heat insulation, moisture isolation performance.
Easy bonding: suitable for epoxy, unsaturated polyester and other resin systems, high bonding strength.
Processing convenience: it is easy to be machined, and can be bent into various curved surfaces under heating conditions, improving the design freedom.
Fatigue resistance: the unique molecular structure gives it good fatigue resistance, especially suitable for the composite sandwich structure bearing dynamic load.
Aluminum equivalent and dielectric permeability: low aluminum equivalent, suitable for medical device industry. In a wide range of frequency with low dielectric constant, low dielectric loss, with good electrical insulation, suitable for radar equipment.
二、型号分类
细孔:具有优异的力学性能和良好的表面粘接性，主要用于碳纤维预浸料真空热压罐成型；型号标识为“名义密度-X”。
粗孔:具有更好的切削加工性和表面粘接性，主要用于碳纤维预浸料模压成型；型号标识为“名义密度-C”。
超细孔:具有极低的吸胶量，主要用于浮标、水上器材和轻型无人机；型号标识为“CX名义密度”。
三、典型性能
PMI泡沫典型性能