BAPP-2TF型聚酰亚胺薄膜的制备与性能研究

以2,2-双[4-（2-三氟甲基-4-氨基苯氧基）苯基]丙烷（BAPP-2TF）单体为二胺原料,与二苯醚四羧酸二酐（ODPA）、二苯甲酮四甲酸二酐（BTDA）、联苯四羧酸二酐（BPDA）、双酚A二酐（BPADA）二酐单体聚合、亚胺化得到4种聚酰亚胺薄膜,并进行研究分析。结果表明,BAPP-2TF系列薄膜具有良好的疏水性、耐热性、光学透明性和优良的力学性能。     

2,2-双[4-(3-氨基苯氧基)苯基]丙烷的合成与应用

介绍了2,2-双[4-（3-氨基苯氧基）苯基]丙烷单体的合成路线,阐述了这种单体在制备聚酰亚胺薄膜、耐高温分散涂料、光刻胶等方面的应用状况。     

2,2-双[4-(4-氨基-2-三氟甲基苯氧基)苯基]砜及其聚酰亚胺的合成与性能研究

2-氯-5-硝基三氟甲苯与4,4’-二羟基二苯砜经亲核取代反应得到2,2-双[4-(4-硝基-2-三氟甲基苯氧基)苯基]砜(Ⅰ),然后在Pd/C和水合肼作用下发生还原反应得到2,2-双[4-(4-氨基-2-三氟甲基苯氧基)苯基]砜(Ⅱ)。该二胺单体Ⅱ分别与均苯四甲酸二酐(PMDA)、3,3’,4,4’-联苯四酸二酐(BPDA)、3,3,’4,4’-二苯醚四酸二酐(ODPA)和3,3’,4,4’-二苯甲酮四酸二酐(BTDA)进行低温缩聚反应得到聚酰胺酸,经热酰亚胺化制备出4种砜基取代含氟聚酰亚胺(PI)薄膜。结果表明,这些PI薄膜均具有良好的光学透明性和溶解性,其中ODPA基PI薄膜的光学透明性最好,450 nm处的透光率达到85.4%。     

含氟聚酰亚胺的合成与性能研究

利用含氟二胺2,2-双[4-(4-氨基-2-三氟甲基苯氧基)苯基]六氟丙烷与均苯四甲酸二酐(PMDA)在强极性非质子溶剂DMAc中进行聚合反应得到粘稠聚酰胺酸溶液,涂膜后经热酰亚胺化得到含氟聚酰亚胺薄膜,对其性能进行了研究,并与聚酰亚胺(PMDA-ODA)进行了比较.结果表明,该含氟二胺可明显改善聚酰亚胺的透明性和溶解...     

1,3-双(4-氨基-2-三氟甲基苯氧基)苯及其无色透明聚酰亚胺薄膜的制备与性能研究

以间苯二酚和2-氯-5-硝基三氟甲苯为基本原料,在N,N-二甲基甲酰胺溶剂中,经亲核取代反应制得1,3-双(4-硝基-2-三氟甲基苯氧基)苯(DNRes-2TF),并利用Pd/C、水合肼进一步还原得到1,3-双(4-氨基-2-三氟甲基苯氧基)苯(DARes-2TF)。随后,以该二胺和芳香族二酐在N,N-二甲基乙酰胺(DMAc)溶剂中,聚合得到聚酰胺酸溶液,热亚胺化得到无色透明聚酰亚胺薄膜,并对薄膜性能进行了研究。结果表明:含氟取代基及间位取代结构是制备无色透明聚酰亚胺的一条颇具前途的路线,且不会牺牲材料的耐热稳定性及力学性能。     

含酚羟基聚酰亚胺薄膜的研制

以2,2-双（4-羟基苯基）丙烷（BHPP）为原料,经过硝化反应和还原反应,获得了高纯度的2,2-双（3-硝基-4-羟基苯基）丙烷（BNHPP）和2,2-双（3-氨基-4-羟基苯基）丙烷（BAHPP）化合物。利用差示扫描量热计（DSC）、傅立叶转换红外光谱仪（FT-IR）等仪器,对它们进行了表征。此外,用2,2-双（3-氨基-4-羟基苯基）丙烷（BAHPP）化合物、4,4＇-二氨基二苯醚（44ODA）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,得到了高粘度的含酚羟基聚酰胺酸（PMDA/44ODA/BAHPP-HPAA）溶液,经涂膜、热亚胺化,得到了相应的坚韧透明的含酚羟基聚酰亚胺（PMDA/44ODA/BAHPP-HPI）薄膜,并对其性能进行了研究。     

2,2-双〔4-(3-氨基苯氧基)苯基〕丙烷制备及其可溶性聚酰亚胺的研究

本文以2,2-双[4-(3-氨基苯氧基)苯基]丙烷(3-BNPOPP)为原料,在活性炭,六水氯化铁(FeCl2@6H2O)和水合肼(H2NNH2@H2O)的共同作用下还原制得2,2-双[4-(3-氨基苯氧基)苯基]丙烷(3-BAPOPP).经熔点测试、红外光谱、核磁共振和元素分析等手段对其进行了表征.以3-BAPOPP为单体,合成了可溶性好,粘结力强的聚酰亚胺树脂.     

四甲基双酚A型二胺单体及其聚酰亚胺的合成与应用

从四甲基双酚A和对氯硝基苯出发,经硝化、水合肼还原反应,合成了二胺单体2,2-双[3,5-二甲基-4-(4-氨基苯氧基)苯基]丙烷(TBAPP)。TBAPP在N,N-二甲基乙酰胺(DMAc)溶剂中分别与多种二酐进行缩合反应,得到的聚酰胺酸在热作用下脱水环化成聚酰亚胺,并在二层法挠性覆铜板(2L-FCCL)的应用方面做了一些研究。结果表明,相应的2L-FCCL具有良好的耐锡焊性和较低的吸水率。     

新型芳香二胺的合成及其聚酰亚胺的应用研究

首先通过双酚A和碳酸钾反应得到酚钾盐,与间-二硝基苯反应合成2,2-双[4-(3-硝基苯氧基)苯基]丙烷(3-BNPP),再用水合肼还原得到新型芳香二胺单体2,2-双[4-(3-氨基苯氧基)苯基]丙烷(3-BAPP)。用3-BAPP与多种二酐合成出多种聚酰亚胺,并在二层法挠性覆铜板(2L-FCCL)的应用方面做了一些研究。研究表明其相应的2L-FCCL具有良好的耐锡焊性能和较低的吸水率。     

新型脂环-芳香族聚酰亚胺薄膜的制备及其性能研究

2,2-双[4-(4-氨基苯氧基)苯基]丙烷(NJXBAPP)、3,3'-二甲基-4,4’-二氨基二环己基甲烷(DMDC)与2,2-双[4-(3,4-二羧基苯氧基)苯基]丙烷二酐(BPADA)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(NJXBAPP-DMDC-BPADA/PAA)溶液,涂膜,热亚胺化,获得了相应的聚酰亚胺(NJXBAPP-DMDC-BPADA/PI)薄膜。利用差示扫描量热计(DSC)、傅立叶转换红外光谱仪(FT-IR)、紫外-可见分光光度计等仪器,对其性能进行了研究。结果表明:该薄膜具有良好的疏水性、热稳定性和力学性能,较宽的光谱范围内具有良好的透明性,吸水率为3.12%。     

LiFePO4前驱体FePO4的制备及性能

以FeSO4、H3PO4和H2O2为原料,通过控制反应温度、pH值、FeSO4与H3PO4的物质的量比等反应条件,合成了前驱体FePO4.在氩气气氛中煅烧FePO4、Li2CO3和葡萄糖的混合物,制备了LiFePO4.充放电测试表明:LiFePO4样品具有3.4 V的放电电压平台,在0.1 C倍率下的首次充放电比容量分别为154.1 mAh/g和146.5 mAh/g.     

Structure and ferroelectric property of Nb-doped SrBi4Ti4O15 ceramics

Nb-doped SrBi₄Ti₄O₁₅ (SBT) was produced by conventional method. Structural and ferroelectric properties of SBT were examined as a function of niobium composition. Analyzing the structure futures of SBT by XRD, XPS and Raman spectrum, Nb⁵⁺ substituted Ti⁴⁺ to form NbO₆ octahedron and did not change the structure of SBT. The XRD patterns indicated the formation of the single phase of SBT for x = 0.01and 0.03 and secondary phase of Sr₃Ti₂O₇ appeared when x > 0.1. To compare the effect of Nb doping, the ferroelectric properties (hysteresis loop, piezoelectric coefficient) of Nb-doped SBT were measured. The SBT doped with x = 0.15 was found to exhibit higher remanent polarization with d ₃₃ = 17 pC/N.     

新型四相输电方式与三相变四相变压器

概要分析了四相输电的主要优点。论述了四相输电中的关键设备三相变四相变压器接线原理及电磁变换关系,为新型四相输电方式的研究及应用提供理论依据。     

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。     

Processing and property of textured lead-free SrTi4Bi4O15 piezoelectric ceramics

In this paper, textured SrTi₄Bi₄O₁₅(SBT) ceramics were produced by tape casting and hot-pressing to improve the piezoelectric property. Plate-like SBT powders were synthesized by a molten salt synthesis (MSS) method. Tape casting and hot-pressing were employed to obtain (00l) oriented SBT ceramics at 1,000°C with a density of 98.3%. Anisotropy characters of textured SBT were measured by piezoelectric coefficient and hysteresis loop. Compared with randomly oriented ceramics, textured SBT shown enhancements in the piezoelectric properties. Property of perpendicular to hot pressing direction (d ₃₃?=?17 pC/N) was more eminent than that of parallel to hot pressing direction (d ₃₃?=?1 pC/N).     

Microstructures and electric characteristics of SrNdCoO4 ceramics with K2NiF4 structure

SrNdCoO₄ ceramics with tetragonal K₂NiF₄ structure were prepared by a solid-state reaction process. The frequency and temperature dependence of dielectric and conductive properties were studied. A peak was found at ～325 °C on both dielectric constant (?) and conductivity (σ) plots with temperature. After annealing in O₂, the peak of ? disappeared while that of σ just shifted a little toward high temperature side. So, some oxide vacancies existed in the polycrystalline SrNdCoO₄, which contributed much to ? but influenced σ only slightly in the measured temperature and frequency range. A lower resistivity of 3.7 Ωcm was obtained in SrNdCoO₄ ceramics sintered at 1150 °C.     

Ferroelectric and piezoelectric properties of tungsten doped CaBi4Ti4O15 ceramics

Tungsten doped CaBi₄Ti₄O₁₅ (CBT) ceramics was prepared by solid-state reaction method. A pure single phase of layer-structured ferroelectric with m?=?4 was formed when x?≤?0.025. The effect of W doping on dielectric, ferroelectric and piezoelectric properties was investigated. W⁶⁺ doping increased the temperature stability of dielectric constant and decreased dielectric loss. W⁶⁺ doping decreased the remanent polarization, while the coercive field decreased as well, as a result, the piezoelectric constant was increased. AC conductivity measurement showed that W⁶⁺ doping increased the conductivity of CBT ceramics and showed n-type conducting mechanism. W⁶⁺ doped ceramics has smaller activation energy due to many defects introduced in the crystal lattice.     

(LiFePO_4+LiMn_2O_4)/Li_4Ti_5O_(12)电池的制备与安全性能

用磷酸铁锂和锰酸锂复合材料作为锂离子电池的正极活性物质,与钛酸锂负极材料匹配制备了钛酸锂电池。制备的电池有较宽的充放电平台,锰酸锂提高了电池的充放电电压,所制备的钛酸锂电池具有良好的循环性能、倍率放电性能和安全性能。