聚硫醚酰亚胺树脂及其薄膜的研制

利用4,4′-双(4-氨基苯氧基)二苯硫醚(DADPSE)单体与3,3′,4,4′-二苯醚四羧酸二酐(ODPA)单体进行聚合反应制得了粘稠状的聚硫醚酰胺酸(DADPSE/ODPA-PAA)溶液,经涂膜热亚胺化得到聚硫醚酰亚胺(DADPSE/ODPA-PI)薄膜,并对溶液的粘度以及薄膜的电性能、力学性能、红外光谱、紫外-可见光透光率进行了研究,结果表明:制备的聚酰亚胺薄膜具有优良的绝缘性能和力学性能,且透明性较好。     

4，4’-双（4-氨基苯氧基）二苯硫醚及其聚酰亚胺的合成与性能研究

4,4'-二羟基二苯硫醚(44DHDPS)、4-氯硝基苯(4CNB)和碳酸钾在N,N-二甲基甲酰胺(DMF)和甲苯的混合溶剂体系中回流反应,合成得到了4,4'-双(4-硝基苯氧基)二苯硫醚(DNDPSE);随后,在Pd/C-水合肼的还原体系中,被进一步还原,得到了4,4'-双(4-氨基苯氧基)二苯硫醚(DADPSE)。另外,将所得到的4,4'-双(4-氨基苯氧基)二苯硫醚(DADPSE)与均苯四甲酸二酐(PMDA)在强极性非质子有机溶剂中进行聚合反应,得到了粘稠状的聚酰胺酸(DADPSE/PMDA-PAA)溶液,涂膜、热亚胺化,得到了相应的聚酰亚胺(DADPSE/PMDA-PI)薄膜,并对其性能进行了研究。     

硫醚型聚酰亚胺薄膜的制备与性能研究

采用3种异构硫醚二酐(TDPA)和二胺单体2,2′-二(三氟甲基)-4,4′-二氨基联苯(TFDB)进行缩聚反应制备聚酰亚胺树脂,然后制得相应的聚酰亚胺薄膜,并对其热性能、力学性能、光学性能进行了对比研究。结果表明:3,4′-TDPA和4,4′-TDPA制备的聚酰亚胺薄膜都具有较高的玻璃化转变温度和良好的可见光透过率。     

含活性基聚酰亚胺薄膜的研制

将3,5-双(4-氨基苯氧基)苯甲酸(35BAPBA)、二苯醚四羧酸二酐(ODPA)进行缩聚反应,得到聚酰胺酸(PAA)溶液,然后经过合适的固化工艺使其脱水热亚胺化,制得含羧基的聚酰亚胺薄膜,并对其性能进行研究.结果表明:含羧基的聚酰亚胺薄膜具有良好的紫外吸收性能、疏水性、电绝缘性等.     

多苯氧基型聚酰亚胺的合成与表征

以4,4'-二羟基二苯醚、对硝基氯苯为原料,缩合制得4,4'-二(4-硝基-苯氧基)二苯醚,后采用水合肼还原得到4,4'-二(4-氨基-苯氧基)二苯醚(BAPE)单体;将其与PMDA(均苯四甲酸二酐)通过缩聚反应、热环化制备了一种多苯氧基型聚酰亚胺。结果表明:缩合制备4,4'-二(4-硝基-苯氧基)二苯醚,收率达到99.3%以上。还原制备4,4'-二(4-氨基-苯氧基)二苯醚(BAPE)单体,熔点125.9~126.8℃,母液回用后收率达85.9%以上。此种单体制备的聚酰亚胺玻璃化转变温度达280.8℃,具有较高的耐热性能,拉伸强度达到99.67 MPa,断裂伸长率为17.32%,是一种性能优良的材料。     

1,3-双(4-氨基苯氧基)苯及其聚酰亚胺的合成、表征和应用研究

合成了二胺单体1,3-双(4-氨基苯基)苯。采用该二胺和二苯酮四酸二酐聚合,合成了较高分子量的聚酰亚胺前驱体,通过热亚胺化和化学亚胺化得到了聚酰亚胺粉末和薄膜,通过TGA、DSC、拉伸等测试,对聚酰亚胺的有关性能进行了表征;对该聚酰亚胺在二层柔性覆铜板上的应用进行了初步研究。     

联苯型聚酰亚胺复合管膜的制备及其电性能研究

通过原位缩聚,采用3,3',4,4'-联苯四羧酸二酐(BPDA)和4,4'-二氨基二苯醚(ODA)为主要原料制备了聚酰亚胺(PI)复合管膜.首先合成聚酰胺酸(PAA),并旋涂制备了聚酰胺酸管膜,然后将溶有碳粉的氟树脂与纯聚酰胺酸管膜复合并热亚胺化,最后再涂覆保护层,制得PI复合管膜.采用傅里叶红外光谱仪(FT-IR)、差式扫描量热法(DSC)、热重分析(TGA)、精密阻抗分析仪和高阻计分别对聚酰亚胺复合管膜的结构、玻璃化转变温度(Tg)、分解温度(Td)、介电性和电阻率进行了表征.研究结果表明,聚酰亚胺管膜的Tg为312.5℃,失重5%的分解温度为560℃.PI复合管膜的介电常数较纯PI管膜稍有增加,碳粉层的加入有效改善了纯PI管膜的介电常数随频率的突变行为,而介质损耗方面.PI复合管膜比纯PI管膜稍有降低.PI复合管膜的表面电阻率比纯PI管膜降低了92.85%,体积电阻率比纯PI管膜降低了77.30%.     

3,3',5,5'-四甲基-4,4'-二氨基二苯甲烷及其聚酰亚胺的合成与应用

在酸催化条件下,利用2,6-二甲基苯胺和甲醛为原料,一步法制得了高纯度的3,3',5,5'-四甲基-4,4'-二氨基二苯甲烷(AMD),运用H-NMR,FTIR,HPLC和熔点测试技术对其进行了表征。结果表明:合成的AMD纯度较高;AMD和BTDA聚合制得较高分子量的聚酰胺酸,经化学亚胺化得到聚酰亚胺(PI),将其溶解后涂覆制得的聚酰亚胺薄膜有一定的溶解性、成膜性及较好的力学性能。     

一种含砜基聚酰亚胺在两层挠性覆铜板中的应用

将一种含砜基芳香杂环二胺(DAMI)分别与均苯四酸二酐(PMDA)、3,3’,4,4’-联苯四酸二酐(BPDA)、3,3’,4,4’-二苯酮四酸二酐(BTDA)合成聚酰胺酸,经过热亚胺化制得聚酰亚胺,并将其应用于两层挠性覆铜板。对聚酰亚胺进行热学和力学性能测试,对两层挠性覆铜板进行剥离强度测试。结果表明:合成的聚酰亚胺的拉伸强度均大于90 MPa,玻璃化转变温度均在230℃以上;制备的两层挠性覆铜板剥离强度良好,聚酰亚胺与铜箔之间接触良好。     

新型聚酰亚胺的合成及其性能

用全间位苯氧基键接的芳族二胺即 1 ,3-双 (3-氨基苯氧基 )苯 (简称 BAPB) ,在室温下 ,以DMAC为溶剂 ,分别与均苯四甲酸二酐 (PMDA)、氧撑二苯酐 (ODPA)、3,3′,4,4′-二苯酮四羧酸二酐 (BTDA)以及双酚 A二酐 (BPADA)缩聚得到多种新型热塑性线型聚酰亚胺。利用 Fourier转换红外光谱 (FTIR)、差示扫描量热法 (DSC)和热重分析 (TGA)等技术对这些新型聚酰亚胺的性能进行了研究     

一种新型体修饰酶生物燃料电池研究

介绍了多壁碳纳米管体修饰石墨电极和天青A膜电聚合的制备方法,研究了电聚合膜时的影响因素。实验结果表明,当硝酸钠加入量为3.400 g(0.4 mol/L),引发电位范围为-1.0~2.0 V,电聚合pH=6.5,聚合圈数为10时制得的导电聚合物膜导电性能最佳。Graphit-MWNTs/PAA/GOD/PEI阳极在含0.1 mmol/L葡萄糖(pH=7.4)的PBS中,-0.375 V(vs.SCE)处电流密度为0.021 mA/cm2,实验表明该电极可使用寿命较长,应用前景广。     

聚酰亚胺／蒙脱土纳米复合薄膜的制备和性能研究

本文以均苯四甲酸二酐（PMDA）和4,4’－二氨基二苯醚（DAPE）作主要原料合成的聚酰亚胺（PI）为基体,以有机化蒙脱土（MMT）为无机相,制备了聚酰亚胺／MMT纳米复合薄膜,采用透射电镜（TEM）,X射线衍射（XRD）对薄膜微相形态结构进行了分析测试,考察了薄膜的拉伸强度,电气性能和热性能。     

聚酰亚胺/导电炭黑抗静电复合薄膜的性能研究

采用原位聚合法制备了聚酰亚胺/导电炭黑(PI/ECB)抗静电复合薄膜,并探讨了复合薄膜的结构、微观形貌以及导电炭黑用量对其表面电阻率、热性能和力学性能的影响。结果表明:复合薄膜亚胺化完全,热性能得到提高;炭黑的质量分数为4%时,复合薄膜表面电阻率的数量级为108,达到抗静电的最佳要求。     

Preparation and Properties of a Thermal Insulating Layer and a Buffer Layer for Multilayer Pyroelectric Film Infrared Detector

A thermal insulating layer and a buffer layer play a key role in the multilayer pyroelectric thin film infrared detector. In this work, a porous SiO 2 film serving as thermal insulating layer and a dense SiO 2 film serving as buffer layer were prepared by sol-gel method. The porosities of the porous film and the dense film are about 50% and 6%, respectively. Maximum thickness values of a single layer porous film and that of a single layer dense film all come up to 1.5 w m. Rms (root-mean-square) surface roughness of the porous film is about 40 nm and that of the dense film is about 1.5 nm. Experimental result shows 0.4 w m dense SiO 2 film can flatten rough surface of the porous SiO 2 film, and the rms surface roughness is less than 5 nm. The composite SiO 2 film can effectively block thermal diffusion.     

Sintering behavior of silver conductive thick film with frit in information display

A silver conductive thick film with a frit was examined for its potential applications in the plasma display panel industry. A low melting glass frit (firing temperature, less than 600 °C) was used in the conductive thick film for this work. The thermal behavior of the silver, frit and mixing powder was studied using hot stage microscopy. During the sintering of the silver conductive thick film with the frit, the frit melted, which was followed by accelerated densification. However, the increase in spreading rate with frit affected the microstructure, which has 1.9% porosity and the geometry of the silver conductive thick film. These results suggest that the content of the frit, firing temperature and the thermal properties of the frit in the silver conductive thick film influence the level of shrinkage, conductivity, and shape of the thick film.     

铝在碱性胶体电解质中的阳极行为

用电化学测试法分别考察了"羧甲基纤维素钠(CMC) 4 mol/L KOH"和"聚丙烯酸(PAA) 4 mol/L KOH"胶体电解质对铝阳极的电化学性能影响.结果表明:铝在2.5%PAA胶体电解质中的电化学性能比在CMC胶体电解质中的好;在2.5%PAA胶体电解质中分别添加0.50 mmol/L Na2SnO3、0.05 mmol/L HgCl2和0.80 mmol/L K2MnO4,对铝的缓蚀、活化作用都有所改善.效果最好的是Na2SnO3,K2MnO4次之.     

Influence of Different Substrates on the Detectivity of Pyroelectric Sensors

Nanosized lead titanate doped with calcium and lanthanum (PCLT) powder obtained by the sol-gel method was homogeneously mixed with vinylidene fluoride-trifluoroethylene [P(VDF-TrFE)] to form nanocomposites. Several pyroelectric sensors were prepared on porous silicon dioxide, on poly(ethylene terephthalate) (PET) film and on bulk silicon substrates, respectively. The nanocomposite PCLT/P(VDF-TrFE) sensing film was deposited by spin-coating and Ni-Cr film was deposited as the top electrode and absorption layer. Experimental results showed that the substrate of the pyroelectric sensor could significantly affect the specific detectivity. The porous silicon dioxide and PET plastic film substrates could effectively decrease the thermal conductivity and the thermal fluctuation noise of the pyroelectric element, increase the voltage responsivity and the specific detectivity. The results indicated that the specific detectivity of PCLT/P(VDF-TrFE) pyroelectric sensors based on porous silicon dioxide and PET plastic film substrates reached 4.2E6 and 3.4E7 cmHz 1/2 W m 1 respectively, which is about 1-2 orders of magnitude higher than that of the sensors formed under the same condition on the bulk silicon substrate.     

含羧基聚酰亚胺薄膜的制备与性能研究

以3,5-二氨基苯甲酸(35DABA)、4,4’-二氨基二苯醚(44ODA)和3,3’,4,4’-四甲酸联苯二酐(BPDA)为原料,在强极性非质子有机溶剂中进行聚合反应,制得了高粘度含羧基聚酰胺酸(CPAA)溶液,经涂膜、热亚胺化,得到了坚韧透明的含羧基聚酰亚胺(CPI)薄膜,并对其性能进行了研究.结果表明:CPI薄膜...     

锂离子电池热失控过程负极放热反应研究

采用热重分析-傅里叶变换红外光谱法(TGA-FTIR)、差示扫描量热法(DSC)和X射线衍射光谱法(XRD)对锂离子电池中石墨负极材料在热失控和热爆炸中的反应机理进行了系统的研究和探讨.研究表明,石墨表面在最初循环中形成的原始固体电解质(SEE)膜具有热不稳定性,在t＞70 ℃时开始分解.而失去了原始SEI膜保护,会导致石墨中嵌入锂和其表面电解液的接触,在高温时形成二次电解质膜.详细讨论了石墨中嵌入锂的数量和石墨颗粒的结构、形状及其层状结构边缘的比表面对二次电解质膜形成的影响.