Overview
Polyimide (PI) products are advanced engineering materials derived from polymers containing imide monomers. First developed in the 1950s, PI materials are renowned for their ability to withstand extreme temperatures (−269°C to +400°C) while maintaining structural integrity. They are commercially available as films (e.g., Kapton), fibers, adhesives, and molded parts. PI’s molecular structure features aromatic and heterocyclic rings, contributing to its rigidity and stability. These products are synthesized through polycondensation reactions between dianhydrides and diamines, resulting in fully imidized chains. The manufacturing process often determines key characteristics like flexibility, dielectric strength, and thermal conductivity.
Physical and Chemical Properties
PI products exhibit exceptional thermal stability, with glass transition temperatures (Tg) exceeding 360°C and decomposition temperatures above 500°C. Their low thermal expansion coefficient (3–5 ppm/°C) matches metals like copper, making them ideal for electronic applications. Mechanically, PI films offer tensile strengths of 100–400 MPa and elongation rates of 5–70%. Chemically, PI resists most organic solvents, oils, and acids, though prolonged exposure to strong alkalis may cause hydrolysis. The material’s dielectric constant (3.0–3.5 at 1 kHz) and volume resistivity (>10¹⁶ Ω·cm) make it a superior electrical insulator. UV resistance varies by formulation, with some grades requiring protective coatings for outdoor use.
Main Applications
In electronics, PI films serve as substrates for flexible printed circuits (FPCs) and coverlays in smartphones, wearables, and automotive displays. Their dimensional stability under thermal cycling is critical for multilayer PCBs. Aerospace applications include wire insulation, thermal blankets, and composite components in satellites and aircraft, where weight savings and radiation resistance are paramount. Industrial uses include high-temperature filtration membranes, seals, and bearings in harsh environments. The medical field employs PI for sterilizable components and implantable device coatings. Emerging applications include battery separators for electric vehicles and substrates for flexible solar panels.
Safety and Storage
PI products are generally safe to handle, with low toxicity and minimal off-gassing below 300°C. However, machining processes like laser cutting may produce respirable particles; local exhaust ventilation and PPE (N95 masks) are recommended. Dust accumulation should be controlled to prevent electrostatic discharge in cleanroom settings. Storage requires protection from moisture (maintain <40% RH) and UV degradation. Rolls of PI film should be stored vertically to prevent creasing. Pre-drying at 150°C for 2–4 hours is advised before high-temperature processing to eliminate absorbed moisture. Shelf life typically exceeds 5 years when stored in original packaging at 15–30°C.
B2B Procurement Guide
When sourcing PI products, clearly define technical requirements: thickness tolerances (standard ±5%), thermal conductivity (0.1–0.35 W/m·K), and dielectric strength (100–300 kV/mm). For films, surface roughness (Ra <0.1 µm) and adhesive compatibility are critical for lamination processes. Custom formulations are available with additives like graphite or PTFE for enhanced properties. Lead times vary from 2 weeks for standard grades to 8 weeks for specialty items. Bulk orders (>100 kg) may qualify for 10–15% discounts. Verify supplier certifications like UL recognition, ISO 9001, and RoHS compliance. For aerospace applications, ensure materials meet standards like NASA-RP-1124 or MIL-STD-883.
Related Manufacturers
- 主营：[]
- 主营：[]
- 主营：隔热板、保温板、高温零件、耐高温模具、窑炉加热装置、防火耐火材料、防火隔热材料、硅酸铝针刺毯、硅酸铝纤维板、酸铝纤维背衬板、高温耐火纤维毯、炉壁陶瓷纤维板、隔热陶瓷纤维板
- 主营：无纺布、滑石粉、特氟龙、聚酰亚胺、耐溶剂、粘合剂、热熔胶、共聚物、耐酸碱、相容剂、超细粉、氟乙烯、锂电池、299涂料、活塞环、细微粉、聚丙烯、喷涂粉、玻璃珠、润滑油、sma树脂、粘接剂、蒸煮袋、润滑剂、铝塑膜、增稠剂
- 主营：塑料增韧剂、增刚剂、抗氧剂、聚酰亚胺PI、抗紫外线剂、塑料粉末、弹性体材料 tpu tpr tpe、微晶蜡、低熔点石蜡
- 主营：美光纸、工业胶带、双面胶带、FPC回流焊聚酰亚胺胶带、玻璃布胶带、电子产品胶带、玻纤铝箔胶带、热风整平股带、导电屏蔽胶带、剥离无痕不残胶、复合红美饮股带
- 主营：切割机、裁剪机、振动刀切割机、聚酰亚胺膜切割机、刀片切割机、数控切割机、非金属切割机
- 主营：pet胶带、玻璃布胶带、绿色高温胶带、聚酰亚胺胶带、绿色pet胶带、金手指胶带、Pet保护膜、耐高温保护膜、耐高温胶带、等离子喷涂胶带
- 主营：增塑剂、二甲基亚砜、顺酐、环丁砜、二甲基二硫醚、赋臭剂、四氢噻吩加臭剂、环戊烷、塑化剂、二辛酯、石油醚、异丁醇、氯化苄、叔十二硫醇、硬脂酸钙、树脂涂料、四氢噻吩、化学试剂、国标染料、氯乙酸、硬脂酸锌、乙二醛、异辛烷、橡胶塑料
- 主营：聚醚醚酮、PEEK加工
- 主营：PEEK、PEEK原料、PEEK加纤、PEEK加碳纤、PEI塑料、PEI 1000、PES加纤、PPSU塑料、PSU塑料、PSU原料、PSU透明料、PPS加纤、POM加纤、POM改性料、PBT加纤阻燃、PBT加纤、PA66增韧、PA66加玻纤、PMMA粉、PVDF、FEP、ETFE、大金FEP、FEP聚全氟乙烯、聚全氟乙烯
- 主营：绝缘材料、绝缘板材、绝缘管材、聚酰亚胺膜、云母板、绝缘纸板、环氧板、复合材料、变压器散热器片、变压器油箱、绝缘纸、酚醛布板、pp板、亚克力板、FR4玻纤板、3240环氧板
- 主营：正辛烷、偶氮二异丁腈、二甲基亚砜、聚酰亚胺溶液、聚磷酸铵、二氧化硒、甲醇钠、聚乙烯吡洛烷酮、叔丁醇、对苯二胺、邻苯二胺、香精、间苯二胺
- 主营：LCP、PA66、PSU、聚酰亚胺、TPEE、PEEK、PA12、PBT/ASA、PPSU、PPS、PC、PC/ABS、ABS、润滑脂、PTFE、特富龙
- 主营：化工中间体、生物缓冲剂、实验试剂助剂
- 主营：正牌料、高温特种塑胶、工程材料、橡胶原料、通用塑胶、PA66、POM、PFA、ETFE、PVDF、PBT、PC、ABS、PEEK、PTFE、FEP、PP、PC/ABS
- 主营：聚苯胺、脯氨酸甲酯盐酸盐、苄基三甲基氯化铵
- 主营：甲基丙烯酸十二酯、甲基丙烯酸十六酯、甲基丙烯酸十八酯、丙烯酸十二酯、丙烯酸十六酯、丙烯酸十八酯、V50引发剂、偶氮二异丁咪唑啉盐酸盐、N-乙酰己内酰胺、硅烷偶联剂、双马来酰亚胺、马来酸酯、缩水甘油酯、缩水甘油醚、甲基咪唑、N-异丙基丙烯酰胺、金属萃取剂
- 主营：三硫代碳酸钠、红色素-16、聚乙烯亚胺、三乙二醇二异辛酸酯、巯基苯并噻唑钠、L-丙交酯、乙交酯、石油酯-T50、多元醇苯甲酸酯、热压敏染料、光稳定剂、高分子降解材料
- 主营：叔碳酸、十八醛、溶菌酶、均苯型聚酰亚胺、海藻糖、癸二醇、氨基丙基、氢路噻嗪、邻苯二甲、乙基碳二、羟基癸酸、正十七烷、谷胱甘肽、烷二甲醇、松果体素、vc磷酸酯镁、2-甲基丁醛、朱栾倍半萜、丁烷四乙酸、表面活性剂、癸烷撑二醇、缩水甘油邻、10-羟基羊蜡酸、氢氯噻嗪杂质、盐酸邻菲罗啉、壳聚糖季铵盐
- 主营：白炭黑、白僵菌、eva乳液、棕榈蜡、pvc发泡剂、聚碳酸酯、聚乙烯蜡、苯甲酸铵、t-31固化剂