共查询到20条相似文献,搜索用时 62 毫秒
1.
《中国胶粘剂》2016,(6)
以自制的双[4-(4-氨基苯氧基)苯基]砜(BAPS)、4,4′-二氨基二苯醚(ODA)和3,3′,4,4′-二苯醚四甲酸二酐(ODPA)为主要原料,采用共聚法合成了较高黏度的聚酰胺酸(PAA)溶液;然后该PAA溶液经高温酰亚胺化后,制得了TPI(热塑性聚酰亚胺)薄膜。研究结果表明:所有样品均具有较好的尺寸稳定性和较低的吸水率,并具有一定的热塑性;当n(BAPS)∶n(ODA)=50∶50时,相应的TPI薄膜具有相对最好的综合性能,其基本完成了酰亚胺化的转变过程,具有较好的耐热性[玻璃化转变温度(Tg)约为249℃,热失重10%时的温度约为510℃,800℃时的残炭率约为18%]和优异的电绝缘性能(介电常数为2.5、介电损耗为0.001 2和体积电阻率为2.3×10~(13)Ω·m)。 相似文献
3.
流延法制备聚酰亚胺薄膜工艺研究 总被引:1,自引:0,他引:1
以均苯四甲酸二酐、4,4'-二胺基二苯醚为原料,通过缩聚反应制备了聚酰胺酸,采用凝胶渗透色谱(GPC)考察了反应时间对产物重均摩尔质量的影响;测定了干燥过程中聚酰胺酸凝胶膜溶剂含量的变化;并利用电子万能试验机研究了聚酰胺酸薄膜的拉伸工艺。结果表明:聚酰胺酸的适宜反应时间为6h,此时其重均摩尔质量趋于稳定。随着干燥温度的升高和时间的延长,凝胶膜的溶剂含量逐渐减少。分析得到较好的拉伸条件是干燥温度为130℃,溶剂质量分数为30%左右的凝胶膜。聚酰亚胺薄膜经拉伸后,其拉伸强度和模量均随拉伸比的增大而增加。 相似文献
4.
以2,2-双[4-(3,4-二羧基苯氧基)苯基]丙二酐(BPADA)、羟基二胺、含氰基二胺(CNDA)为原料,在160℃且不添加化学脱水剂的情况下,制备了含羟基聚酰亚胺(CN-OH-PI)薄膜,并通过傅里叶变换红外光谱、核磁共振氢谱、差示扫描量热法和热重分析等手段研究了其结构和性能。结果表明:成功合成了CN-OH-PI,将其与以BPADA和CNDA为原料制备的含氰基聚酰亚胺(CN-PI)对比,在300℃条件下热处理12.0 h后,CN-OH-PI的玻璃化转变温度比CN-PI提高约20℃。 相似文献
5.
6.
聚酰亚胺薄膜的加工方法 总被引:3,自引:0,他引:3
刘伟利 《现代塑料加工应用》1993,5(4):61-64
阐述了聚酰亚胺薄膜在加工方面的进展.主要从流延、沉积、拉伸、喷涂等4方面汇集了世界各大公司的加工方法和性能指标;比较了聚合单体.工艺方法、控制参数等对薄膜性能的影响;讨论了聚酰亚胺薄膜加工的发展动态。 相似文献
7.
8.
9.
双向拉伸薄膜在进行纵向拉伸时会发生缩幅现象。这不仅给拉伸膜片带来折皱弊病、造成物性不均。而且,给横向拉伸带来困难。如,幅方向机械特性不均及横拉伸时破膜现象多发等。对此,聚酰亚胺薄膜尤甚。所以,纵向拉伸装置的改进至今都是国际上的重要研究课题。本文介绍其中的一些专利技术信息。 相似文献
10.
11.
12.
A. A. Goodwin 《应用聚合物科学杂志》1999,72(4):543-552
Differential scanning calorimetry and dynamic mechanical analysis of blends of a new thermoplastic polyimide (TPI) and poly(ether imide) (PEI) have confirmed the full miscibility of the system over the whole composition range. Annealing of the blends above the glass transition temperature of TPI, but below its crystallization temperature, did not produce a shift in the glass transition, while physical ageing of the annealed blends also failed to reveal any indication of phase separation. The rate of crystallization of TPI was slowed by the addition of PEI, and the temperature of the maximum crystallization rate shifted upwards. The β‐relaxation behavior of the blends followed a linear trend between the response of the component polymers, while the low‐temperature γ‐relaxation was unchanged by blending. The time scale of physical ageing of the blends did not behave in a linear fashion, and the enthalpy loss on ageing also deviated from the average. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 543–552, 1999 相似文献
13.
聚酰亚胺薄膜性能优异,广泛应用于各种领域。综述了我国聚酰亚胺薄膜的生产技术、应用以及产品价格。指出了国内聚酰亚胺薄膜工业中存在的问题,并对其发展方向提出几点建议。 相似文献
14.
Polyimides are finding increased applications in microelectronics due to their high thermal stability, good chemical resistance, good adhesion, low moisture absorption, good mechanical properties, and low coefficient of thermal expansion (CTE). Four series of random copolyimides were synthesized and characterized for potential application as encapsulants, stress-relief layers, and interlevel dielectrics. Several candidates exhibited good combinations of physical and mechanical properties with inherent viscosities from 1.21 to 1.42 dL/g, Tg's ranging from 251 to 277°C, 10% weight loss temperatures between 503 and 527°C, and CTEs ranging from 33 to 39 ppm/°C. Mechanical properties at room temperature for the best candidates included tensile strengths of 17.8–21.3 ksi, moduli between 388 and 506 ksi, and elongations of 11–43%. Moisture absorption for these copolyimides ranged between 0.85 and 1.38 wt %. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 2383–2393, 1998 相似文献
15.
聚酰亚胺薄膜是目前世界上性能最好的薄膜类绝缘材料之一,具有优良的力学性能、电性能、化学稳定性以及很高的抗辐射性能及耐高温和耐低温性能,在航空航天、国防军工、新型建材、环保消防等领域中发挥着越来越重要的作用。介绍了聚酰亚胺薄膜的理化性能、制取工艺、技术进展、应用领域及市场前景,并对国内聚酰亚胺薄膜产业的发展提出了一些建议。 相似文献
16.
17.
18.
Electrical conduction in Kapton polyimide film was studied under steady-state conditions in the temperature range 100°–200°C and in electric fields of 50–450 kV cm?1. An attempt was made to fit the field dependence of current to one of the several possible mechanisms which have been proposed by different workers. Evidence is presented to suggest that even at high fields ionic conduction may be the operative mechanism of conduction. Values of ionic jump distance of 50–60 Å show good agreement with values reported by other workers. 相似文献
19.
20.
以BAPP为原料的热塑性PI薄膜的合成及性能 总被引:1,自引:1,他引:1
以芳香长链二胺2,2-双[4-(4-氨基苯氧基)苯基]丙烷(BAPP)为二胺原料,与最具商业价值的四种酸酐均苯四甲酸二酐(PMDA)、3,3′,4,4′-联苯四酸二酐(BPDA)、3,3′,4,4′-二苯酮四酸二酐(BTDA)、3,3′,4.4′-二苯醚四酸二酐(ODPA)为二酸酐原料,采用二步溶液缩聚法制得了一系列均聚和共聚聚酰亚胺薄膜。利用FTIR表征了聚酰亚胺的结构,并用DSC、TOA、TMA DMA等手段测得了不同聚酰亚胺的Tg、5%与10%热失重温度、线膨胀系数、拉伸强度、断裂延伸率、热压粘接T型剥离强度等性能数据。 相似文献