5G材料专题:常用高分子材料介电常数表 |
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5G材料专题:常用高分子材料介电常数表
发布日期:2019/6/27 15:48:55 访问次数:6759 介质在外加电场时会产生感应电荷而削弱电场,介质中的电场减小与原外加电场(真空中)的比值即为相对介电常数(relative permittivity或dielectric constant),又称诱电率,与频率相关。介电常数是相对介电常数与真空中绝对介电常数乘积。如果有高介电常数的材料放在电场中,电场的强度会在电介质内有可观的下降。理想导体(金属)的相对介电常数为无穷大。
根据物质的介电常数可以判别高分子材料的极性大小。通常,相对介电常数大于3.6的物质为极性物质;相对介电常数在2.8~3.6范围内的物质为弱极性物质;相对介电常数小于2.8为非极性物质。
同理,我们根据高分子材料的极性也可以大致推测材料介电常数大小,极性基团多,介电常数高,极性基团少介电常数小。下面是常见材料的介电常数的大小:
聚合物 最低值 最高值 HIPS Flame Retardant V0 2 3 PCTFE - Polymonochlorotrifluoroethylene 2 3 PMMA - Polymethylmethacrylate/Acrylic 2 5 FEP - Fluorinated Ethylene Propylene 2.1 2.1 PFA - Perfluoroalkoxy 2.1 2.1 PTFE - Polytetrafluoroethylene 2.1 2.1 PMP - Polymethylpentene 2.1 3.6 HDPE - High Density Polyethylene 2.3 2.3 LDPE - Low Density Polyethylene 2.3 2.3 LLDPE - Linear Low Density Polyethylene 2.3 2.3 PMP Mineral Filled 2.3 2.3 PP, 10-40% Mineral Filled 2.3 2.3 PP, 10-40% Talc Filled 2.3 2.3 PP (Polypropylene) Copolymer 2.3 2.3 PP (Polypropylene) Homopolymer 2.3 2.3 PP, Impact Modified 2.3 2.3 UHMWPE - Ultra High Molecular Weight Polyethylene 2.3 2.3 PMP 30% Glass Fiber-reinforced 2.4 2.4 PS (Polystyrene) Crystal 2.4 2.7 PS, High Heat 2.4 2.7 HIPS - High Impact Polystyrene 2.4 4.8 ABS High Heat 2.4 5 ABS High Impact 2.4 5 PS (Polystyrene) 30% glass fiber 2.5 2.5 EVA - Ethylene Vinyl Acetate 2.5 3 SAN - Styrene Acrylonitrile 2.5 3.4 ECTFE 2.57 2.59 ETFE - Ethylene Tetrafluoroethylene 2.6 2.6 PP - Polypropylene 10-20% Glass Fiber 2.6 2.6 PP, 30-40% Glass Fiber-reinforced 2.6 2.6 PPE - Polyphenylene Ether 2.7 2.7 PPE, Flame Retardant 2.7 2.7 PE - Polyethylene 30% Glass Fiber 2.7 2.8 ABS - Acrylonitrile Butadiene Styrene 2.7 3.2 SMA - Styrene Maleic Anhydride 2.8 2.8 ABS Flame Retardant 2.8 3 MABS - Transparent Acrylonitrile Butadiene Styrene 2.8 3 PC - Polycarbonate, high heat 2.8 3.8 PPE, 30% Glass Fiber-reinforced 2.9 2.9 ABS/PC Blend - Acrylonitrile Butadiene Styrene/Polycarbonate Blend 2.9 3.2 PMMA (Acrylic) Impact Modified 2.9 3.7 PBT - Polybutylene Terephthalate 2.9 4 PA 66, Impact Modified 2.9 5 PC/PBT Blend - Polycarbonate/Polybutylene Terephthalate Blend 2.95 3.14 PTFE, 25% Glass Fiber-reinforced 3 3 PSU - Polysulfone 3 3.2 PPS - Polyphenylene Sulfide 3 3.3 ASA/PC Blend - Acrylonitrile Styrene Acrylate/Polycarbonate Blend 3 3.4 PC (Polycarbonate) 20-40% Glass Fiber 3 3.5 PC (Polycarbonate) 20-40% Glass Fiber Flame Retardant 3 3.8 CP - Cellulose Proprionate 3 4 LCP Glass Fiber-reinforced 3 4 PA 6-10 - Polyamide 6-10 3 4 PBT, 30% Glass Fiber 3 4 PEI, 30% Glass Fiber-reinforced 3 4 PEI, Mineral Filled 3 4 PET - Polyethylene Terephtalate 3 4 PET, 30% Glass Fiber-reinforced 3 4 PETG - Polyethylene Terephtalate Glycol 3 4 POM (Acetal) Low Friction 3 4 PVC Rigid 3 4 PVC, Plasticized 3 5 PVC, Plasticized Filled 3 5 LCP Mineral-filled 3 5.9 CPVC - Chlorinated Polyvinyl Chloride 3 6 PVDC - Polyvinylidene Chloride 3 6 CAB - Cellulose Acetate Butyrate 3 7 CA - Cellulose Acetate 3 8 PA 11, Conductive 3 9 PA 11, Flexible 3 9 PA 11, Rigid 3 9 PA 12 (Polyamide 12), Conductive 3 9 PA 12, Fiber-reinforced 3 9 PA 12, Flexible 3 9 PA 12, Glass Filled 3 9 PA 12, Rigid 3 9 SRP - Self-reinforced Polyphenylene 3.1 3.1 ABS/PC Blend 20% Glass Fiber 3.1 3.2 PEI - Polyetherimide 3.1 3.2 PI - Polyimide 3.1 3.55 ASA/PC Flame Retardant 3.2 3.2 PEEK - Polyetheretherketone 3.2 3.2 SMMA - Styrene Methyl Methacrylate 3.2 3.2 PEEK 30% Carbon Fiber-reinforced 3.2 3.4 SAN, 20% Glass Fiber-reinforced 3.2 3.8 PMMA (Acrylic) High Heat 3.2 4 LCP - Liquid Crystal Polymer 3.3 3.3 PAR - Polyarylate 3.3 3.3 PEKK (Polyetherketoneketone), Low Cristallinity Grade 3.3 3.3 SMA, 20% Glass Fiber-reinforced 3.3 3.3 ASA - Acrylonitrile Styrene Acrylate 3.3 3.8 PPS, 20-30% Glass Fiber-reinforced 3.3 3.8 PC/PBT blend, Glass Filled 3.3 3.9 PEEK 30% Glass Fiber-reinforced 3.3 4.2 POM - Polyoxymethylene (Acetal) 3.3 4.7 PPSU - Polyphenylene Sulfone 3.4 3.5 PA 46 - Polyamide 46 3.4 3.8 PA 66, Impact Modified, 15-30% Glass Fiber 3.4 4.2 Amorphous TPI Blend, Ultra-high heat, Chemical Resistant (Standard Flow) 3.5 3.5 PESU - Polyethersulfone 3.5 4.1 PA 66, 30% Glass Fiber 3.5 5.6 PSU, 30% Glass finer-reinforced 3.6 3.7 PPA, 33% Glass Fiber-reinforced – High Flow 3.7 3.9 PARA (Polyarylamide), 30-60% glass fiber 3.9 4.5 PAI - Polyamide-Imide 3.9 7.3 PPS, 40% Glass Fiber-reinforced 4 4 PPA, 30% Mineral-filled 4 4.2 POM (Acetal) Impact Modified 4 4.3 PA 46, 30% Glass Fiber 4 4.6 PA 6 - Polyamide 6 4 5 PA 66 - Polyamide 6-6 4 5 PA 66, 30% Mineral filled 4 5 PESU 10-30% glass fiber 4.2 4.3 PAI, 30% Glass Fiber 4.2 6.5 PPA - Polyphthalamide 4.3 4.3 PPA, 33% Glass Fiber-reinforced 4.4 4.6 PPA, 45% Glass Fiber-reinforced 4.4 4.6 PA 11 - (Polyamide 11) 30% Glass fiber reinforced 4.8 4.8 EVOH - Ethylene Vinyl Alcohol 4.8 5.6 PPS, Glass fiber & Mineral-filled 5 5 PVDF - Polyvinylidene Fluoride 6 9
目前大家探讨比较多是5G工程塑料,主要分为薄膜产品(LCP,PI等用在线路板,天线)、还有就是结构件(注塑成型),如低介电LCP、PBT、PPO、PPS等。选材中既要满足介电常数低又要满足力学性能、化学性能、电性能等因素。改性塑料的介电常数跟基材的分子结构有关,同时也跟增强/填充材料的介电常数有关。
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