聚酰亚胺/聚苯胺/炭黑抗静电复合薄膜的制备与表征

采用原位复合的方法制备抗静电聚酰亚胺(PI)复合薄膜,以导电炭黑（CB）和聚苯胺（PANI）作为导电改性剂,研究了不同配比下CB与PANI对复合薄膜电性能的影响,通过扫描电子显微镜观察其形貌,同时对材料的热稳定性和力学性能进行分析。结果表明,混合填料填充的复合薄膜粒子间的分散性优于单独加入CB或PANI体系;当PANI和CB比为1∶2时表面电阻达到抗静电的要求且热稳定性最好。     

聚酰亚胺/导电石墨抗静电复合材料的制备与表征

采用原位聚合法制备了聚酰亚胺/导电石墨(PI/CG)抗静电复合材料薄膜,并探讨了复合膜的结构、微观形貌以及导电石墨用量对其表面电阻率、热性能以及力学性能的影响。结果表明:复合膜亚胺化完全、热性能得到提高;石墨的用量为15 phr时,复合膜表面电阻率的数量级为109Ω,达到抗静电的最佳要求范围。     

聚酰亚胺薄膜的制备及表征

用均苯四甲酸二酐(PMDA)和4,4-二氨基二苯醚(ODA)为主要反应原料,二甲基甲酰胺为溶剂,并采用化学亚胺化制备聚酰亚胺薄膜。研究成膜过程对聚酰亚胺薄膜力学性能的影响,并研究了薄膜的耐热性。结果表明,成膜时,在120℃烘箱中放置50 s,300℃烘箱中放置60 h薄膜的力学强度最好。     

聚酰亚胺/二硼化钛复合薄膜的制备及性能研究

本文以原位聚合法制备了聚酰亚胺/二硼化钛(PI/TiB_2)复合材料薄膜,通过红外、X射线衍射(XRD)、热重分析等对复合材料的结构形貌进行了表征,并对其抗静电性、热稳定性能等进行了探讨。结果表明:二硼化钛很好地分散到薄膜中,复合膜亚胺化完全,热性能得到提高;当二硼化钛质量分数为3%时,复合膜表面电阻率为1.84×10~8Ω.cm,达到抗静电要求。添加量为5%时,复合薄膜综合性能最佳。     

聚酰亚胺/纳米钛酸钡复合薄膜的制备与表征

制备了一系列聚酰亚胺及其钛酸钡复合薄膜,并采用了XRD,IR等分析手段分析了复合薄膜的形貌和性能。主要研究内容如下:(1)采用水热法制备钛酸钡粉体;（2）分别用溶液混合法和原位聚合法制备PI/BT纳米复合薄膜。经分析可知,复合膜中钛酸钡粒子较为均匀地分散在聚酰亚胺基体中,并且复合膜的介电性能随钛酸钡粒子含量的增加而增加。在33%（钛酸钡的质量分数）1KHz频率时,制备的复合薄膜介电常数可达35,使其具有广泛的应用前景。     

含纳米ATO透明抗静电涂料的研究

制备了含纳米掺锑二氧化锡(ATO)透明抗静电涂料。讨论了ATO含量、基料树脂、溶剂、研磨时间和附着力促进剂对涂层的表面电阻和透明度的影响，确定了最佳的工艺参数。     

高导热聚酰亚胺薄膜的制备及性能表征

使用KH550表面改性微米级氮化硼、亚微米级和纳米级氧化铝,再将这三种导热填料按照质量比5:3:2的比例加入聚酰胺酸溶液中制备高导热聚酰亚胺薄膜,并对不同填料添加量的聚酰亚胺薄膜进行了一系列表征.结果表明:复合填充可以显著提高薄膜的导热系数,并保持薄膜原有的绝缘强度和耐热性能,拉伸强度下降.当填充量为50％时,薄膜的导热系数为0.78 W/m·K,绝缘强度为250 V/μm,初始分解温度为570℃,拉伸强度为147 MPa.     

聚酰亚胺/纳米二氧化钛复合薄膜制备及表征

采用超声分散-原位聚合的方法,制备了不同纳米二氧化钛(TiO2)含量的聚酰亚胺(PI)/纳米TiO2复合薄膜,通过X射线衍射、紫外可见光谱分析、扫描电子显微镜、红外光谱对薄膜的形态结构及纳米颗粒在复合物中的分散性进行了表征分析.结果表明,纳米TiO2以球状微粒均匀分散在PI基体中,表观粒径约为300 nm(杂化包覆后的粒径),晶形仍为锐钛矿型;纳米TiO2粒子的引入,提高了PI薄膜对可见光的吸收.     

掺锑二氧化锡(ATO)导电粉体的制备与表征

提出了一种改进后的ATO导电粉的制备方法:以SnCl4.5H2O和SbCl3为原料,按Sb2O3∶SnO2=7.5∶100(质量比)的比例,将原料溶于浓盐酸溶液,得无色透明强酸性混合溶液。在搅拌下将该混合溶液滴加到氨水溶液中,并控制pH值为碱性,沉淀经过滤、去离子水和无水乙醇洗涤后,放入烘箱中80~100℃烘干,加入高氯酸铵,磨匀,烘干,得浅黄色粉状前驱物。将此前驱物600℃煅烧4 h,取出,即得电阻率为1.66Ω.cm的灰蓝色导电掺锑二氧化锡粉末。     

聚酰亚胺/聚苯胺-二氧化钛复合薄膜制备及其性能表征

摘要：以4,4 -二氨基二苯醚（ODA）和均苯四甲酸二酐（PDMA）为单体,以聚苯胺-二氧化钛（PANI-TiO2）为掺杂物,用原位聚合和超声振荡法制得墨绿色的黏稠液聚酰胺酸/聚苯胺-二氧化钛,经热亚胺化制得PI/PANI-TiO2复合薄膜。采用FTIR、SEM、TG-DTG、介电常数、电子万能试验机等对复合薄膜的结构、形貌和性能进行了表征与测试,同时与PI薄膜做了比较。结果表明,PI/PANI-TiO2薄膜的热亚胺化完全,PANI-TiO2粒子在PI基体中分布均匀。掺杂质量分数为10%PANI-TiO2的PI/PANI-TiO2复合薄膜的拉伸强度由纯PI的14.8 MPa提高到43.8 MPa;初始分解温度由纯PI的435℃提高到518℃,800℃时的残留量由纯PI的21.3%提高到57.7%;介电常数由3.38提高到3.86,介电损耗由0.0013提高到0.0040。可见PI/PANI-TiO2复合薄膜的力学性能和热稳定性能比未复合的PI增强了,相对介电常数和介电损耗因数提高了。     

高导热聚酰亚胺/氮化硼复合材料的制备与表征

聚酰亚胺(PI)是综合性能优良的一类聚合物。本文利用钛酸酯偶联剂对六方氮化硼(h-BN)进行改性,制备了改性前后不同h-BN含量的复合薄膜,并对其性能进行研究。结果表明:随着h-BN含量的增加,复合材料热导率、热稳定性提高,吸水率下降;相同填料含量下,改性后的h-BN制备的复合薄膜性能皆优于未改性h-BN制备的复合薄膜。     

聚酰亚胺基高导热石墨膜的制备及性能表征

使用KH550为分散助剂,采用剪切、研磨的分散工艺分散微米级碳酸钙,研究对苯二胺（PDA）添加量、碳酸钙添加量对聚酰亚胺薄膜性能的影响,以及由该聚酰亚胺薄膜经碳化、石墨化所得石墨膜的性能表征。结果表明,当ODA∶PDA摩尔比为70∶30,碳酸钙添加量为1.5%时,所制得的聚酰亚胺薄膜拉伸强度达237 MPa,其碳化、石墨化后所制得的石墨膜导热率达1 295 W/（m·k）,具有良好的柔韧性。     

Preparation and Characterization of Aminopropylsilatrane Endcapped Polyimide Films

γ-Aminopropylsilatrane (APS)/γ-aminopropyltriethoxysilane (APTES) end capped polyimide films were prepared by thermal imidization method. Polyamic acid (PAA) was prepared by the reaction of 4,4′-oxydianiline (ODA) with 4,4′-oxydipthalicdianhydride (ODPA) using dimethylacetamide (DMAc) as solvent. The end group of prepared PAA was capped by different percentage of APS/APTES. The polyimide films were characterized by different advanced instrumental techniques for chemical/physical properties. APS end capped PI films show better thermal and mechanical properties and air permeability than APTES end capped polyimide films.     

Preparation and Thermal Degradation of White Fluorinated Polyimide/TiO2 Composite Films with Strong Shielding Performance

A series of white fluorinated polyimide/TiO₂ composite films were prepared by a solution mixing method. They showed high tensile strength beyond 95.1MPa and excellent insulting property with surface and volume resistances exceeding 1.9 × 10¹¹Ω and 2.3 × 10¹² Ω cm, respectively, coupled with water absorptions below 1.1%, water contact angles up to 95.9 and whiteness beyond 58.5. It was found that their optical transparency decreased dramatically with the increasing doping of TiO₂. The thermal degradation of pure fluorinated polyimide (FPI) and representative polyimide/TiO₂ composite film with 5 wt% of TiO₂ (PI/TiO₂-5 wt%) was also studied.     

Preparation, Characterization and Thermal Degradation of Polyimide (4-APS/BTDA)/SiO(2) Composite Films

Polyimide/SiO(2) composite films were prepared from tetraethoxysilane (TEOS) and poly(amic acid) (PAA) based on aromatic diamine (4-aminophenyl sulfone) (4-APS) and aromatic dianhydride (3,3,4,4-benzophenonetetracarboxylic dianhydride) (BTDA) via a sol-gel process in N-methyl-2-pyrrolidinone (NMP). The prepared polyimide/SiO(2) composite films were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and thermogravimetric analysis (TGA). The FTIR results confirmed the synthesis of polyimide (4-APS/BTDA) and the formation of SiO(2) particles in the polyimide matrix. Meanwhile, the SEM images showed that the SiO(2) particles were well dispersed in the polyimide matrix. Thermal stability and kinetic parameters of the degradation processes for the prepared polyimide/SiO(2) composite films were investigated using TGA in N(2) atmosphere. The activation energy of the solid-state process was calculated using Flynn-Wall-Ozawa's method without the knowledge of the reaction mechanism. The results indicated that thermal stability and the values of the calculated activation energies increased with the increase of the TEOS loading and the activation energy also varied with the percentage of weight loss for all compositions.     

Polyimide Ultrafiltration Membranes with High Thermal Stability and Chemical Durability

Abstract

Asymmetric ultrafiltration membranes based on poly[(4,4′-oxydiphenylene)pyromelliteimide] were produced by wet technique from prepolymer casting solution, followed by solid-phase conversion of the prepolymer membranes into polyimide insoluble form at 200°C. It was demonstrated that by adding benzimidazole to the casting solution and filling of prepolymer membrane pores with inert high-boiling oil prior to thermal treatment allow us to prepare asymmetric porous polyimide membranes. The main characteristics of the membranes obtained (permeability coefficients and molecular weight cut-off) match those typical to ultrafiltration membranes. It was found that the developed asymmetric ultrafiltration polyimide membranes have excellent thermal and chemical resistance. The membranes retain rigidity above Tg (360°C) and are chemically stable at temperatures up to 400°C. The developed membranes are resistant against swelling and dissolving in aggressive and organic media including amide solvents.     

聚酰亚胺/水滑石复合材料的制备与表征

采用固相预聚法,将4,4’-二氨基二苯醚（ODA）、联苯四甲酸二酐（BPDA）及水滑石的混合物进行充分研磨,再进行溶液聚合后通过热亚胺化得到聚酰亚胺/水滑石复合材料。采用傅里叶红外光谱仪和X-射线衍射仪对该复合材料的结构和组成进行表征,并对其热性能、力学性能和表面性能进行了分析研究。结果表明,采用此种方法可以得到水滑石剥离及分散较好的聚酰亚胺/水滑石复合材料,当水滑石含量在一定范围内时,复合材料的耐热性能、力学性能均得到一定程度的提高。     

具有疏水性能的PVC抗静电复合塑料管材的制备与表征

制备了聚氯乙烯/聚四氟乙烯(PVC/PTFE)复合材料,并研究了导电炭黑(CCB)对复合材料性能的影响。结果表明:PTFE可以提高复合材料的疏水性能,并且随着PTFE含量的提高,复合材料的疏水性能逐渐提高。另外,CCB不仅可以作为抗静电剂,提高PTFE/PVC复合材料的导电性,同时在一定用量范围下,也可以作为补强剂改善PTFE/PVC复合材料的力学性能。通过制备PVC/PTFE/CCB复合材料,制备了能够用作矿井水体输送的PVC管材料。