导热高分子材料的研究开发现状

综述了近几年来导热高分子材料主要是导热塑料、导热橡胶领域内的研究开发进展。简单阐述了导热高分子材料的导热机理及导热理论模型,在此基础上探讨了优化导热高分子材料综合性能的途径。     

导热高分子材料研究进展分析

在高分子材料科学与工程中导热高分子材料的理论研究与产品开发都是非常重要的部分,随着复合技术的引入和实施,高导热聚合物本材料和纳米复合材料的研究进入一个崭新的阶段,高分子复合材料的导热机理得到深入的研究同时在实践中的应用开发得到更新的进展。建立高分子复合材料导热模型,深入研究聚合物基体与导热填料界面的结构与性能及高分子复合材料的导热机理,不断探索导热本体聚合物材料的制备,这些导热高分子材料的研究为高新技术的发展奠定了坚实的基础。。     

填充型导热高分子研究进展

总结了导热高分子复合材料的导热理论研究,综述了近年来国内外几种常用的提高填充型导热高分子材料导热性能的方法,并对未来研究及发展方向进行了展望。     

导热高分子材料的研究新进展

总述了导热高分子材料的典型理论模型和导热机理；并对国内外导热高分子材料的研究开发现状作了详细介绍；最后提出了导热高分子材料综合性能提高的途径。     

填充型导热高分子复合材料研究进展

综述了国内外导热绝缘填料、导热非绝缘填料和混杂填料填充的导热高分子材料的研究进展.简要地介绍了导热高分子材料的导热机理.分析了导热高分子复合材料目前存在的一些问题,并对其研究方向给出了一些建议.     

导热高分子复合材料的研究进展

介绍了导热高分子复合材料的导热性能,并对导热胶粘剂、导热塑料和导热橡胶的研究进展进行了综述,在此基础上展望了导热高分子复合材料的发展前景。     

导热高分子材料的研究与应用

随着技术的发展,使得导热高分子材料的性能和产量提升,为其在电子技术领域应用提供了良好条件。导热高分子材料优异的性能,满足了微型电子设备的散热问题,最大程度保障电子元器件的使用寿命。首先简要介绍了导热高分子材料的导热机理,以及导热高分子材料应用范围,最后提出导热高分子材料的性能强化措施。     

导热高分子复合材料研究进展

在介绍金属材料、无机非金属材料以及高分子材料导热机理的基础上,介绍了导热填料填充高分子复合材料的导热网链机理和热弹性组合机理2种导热机理,该理论可以解释导热高分子复合材料导热过程中不同的现象和规律;归纳了适用于粒子、纤维等填充的聚合物基复合材料的各种导热模型;讨论了树脂基体、导热填料和温度对于高分子复合材料热导率的影响...     

绝缘导热高分子复合材料研究

介绍了导热绝缘高分子复合材料的导热性能、导热机理,综述了各类导热绝缘高分子如复合型导热塑料、橡胶、胶粘剂、涂层等的研究,并展望了其应用前景及未来发展方向.     

导热高分子材料的研究与应用

随着知识的增多,我们对理论基础上有了一定见解,此时应该更多的关注知识在实际中的应用。此次研究的课题是导热高分子材料,通过对其导热原理的学习,我们要深化它在生活中的功能。研究导热高分子材料不单单可以解决电子元件散热问题,同时还让我们增加了知识面的拓展,有效的扩展学习思路和方式。     

导热防腐涂料的研究进展

对导热防腐涂料在国内外的研究情况进行了综述,并对导热防腐涂料未来的发展方向进行了展望。     

一种油田用导热防腐涂层的导热防腐性能评价

对一种新型的油田用导热防腐涂层技术进行了常规性能检测、导热性能测试和防腐蚀性能测试。结果表明,该涂层常规性能检测项目全部符合相关标准,且在60℃、常压下的油水混合物中具有非常优异的防腐性能和较好的导热性能,应用前景广阔。     

一种抗沉降聚氨酯导热灌封胶的制备研究

采用聚乙烯马来酸酐对氧化铝导热粉体进行表面处理,实现了对氧化铝导热粉体表面化学改性,将表面改性后的氧化铝导热粉体与聚醚多元醇和聚酯多元醇复配制备了抗沉降聚氨酯导热灌封胶。通过对比实验选取了最佳的粉体粒径,同时研究了添加不同的抗沉降剂对聚氨酯导热灌封胶贮存稳定性的影响。结果表明,采用经聚乙烯马来酸酐表面处理且粒径为2μm的氧化铝导热粉体,在不添加抗沉降剂的情况下能有效提升聚氨酯导热灌封胶的抗沉降性能和导热性能。     

Preparation of dense spherical AlN fillers by aqueous granulation and post-sintering process

Herein, an innovative two-step method was proposed to prepare dense spherical aluminum nitride (AlN) fillers for the application of insulating encapsulants, involving spray granulation from AlN-based suspensions and subsequent sintering process to achieve full density. According to investigations on the dispersing ability of powders, the AlN-based aqueous suspensions with various solid loading were firstly prepared for spray granulation. It was indicated that a low-viscosity and high-concentration suspension could enhance the sphericity and uniformity of green granules and simultaneously facilitate the high green density. The spherical AlN green granules were further sintered with boron nitride (BN) powders, which played a role as the interval material to retain the spherical morphology and hinder the agglomerations of AlN granules. The distinct impacts of BN powders, sintering temperatures and additive species on the overall properties of resultant AlN fillers were further studied and rationally uncovered. Based on these results, spherical AlN granules with superior dispersion, low porosity and an average particle size of more than 40 µm were successfully fabricated via the newly-developed two-step method, showing promising potentiality for the application as thermal-conductive fillers.     

超支化聚合物气体分离膜材料的研究进展

综述了超支化聚合物气体分离膜材料的研究进展,介绍了不同种类的超支化聚合物,阐述了传统结构超支化聚合物与大π共轭结构超支化聚合物的等超支化聚合物的合成,详细介绍了偶氮类超支化聚合物、聚酰胺类超支化聚合物及共混类超支化聚合物在分离膜制备中的作用,并对超支化聚合物在气体分离膜领域未来的研究方向进行了展望。     

Thermal and electrical properties of polyimides containing tricyclic fused rings

Polyimides containing a series of tricyclic fused rings were synthesized by polymerization of the tricyclic diamines with aromatic tetracarboxylic acid dianhydrides. The thermal stability of a series of the polymers increased in the order of the thianthrene (SDP) containing polymers < the phenoxatiin (OSP) containing polymers < the dibenzo-p-dioxin (ODP) containing polymers. The polymers derived from 2,8-oriented tricyclic diamines showed somewhat lower glass transition temperature than those from 2,7-oriented diamines. The specific resistivity of the polymers decreased in the order of the SDP containing polymers > ODP containing polymers > OSP containing polymers. The kink temperatures in the temperature dependence curves of specific resistivity were in good agreement with the glass transition temperatures. The photoconductive properties of the polymers were measured using a surface type cell method.     

Multi-step precipitation separation system using mixture of thermosensitive polymers

Summary Multi-step precipitation separation system was developed by using aqueous mixtures of some thermosensitive polymers. The following three polymers were used here; poly(N-n-propylacrylamide), poly(N-isopropylacrylamide), and poly(N-isopropylmethacrylamide). A mixture of the three polymers showed three endothermic peaks, and the peak top temperatures were almost consistent with that of the each polymer solution. The polymers were purified by thermal precipitation to obtain fractions which can respond in narrow temperature ranges prior to use. In the case of the precipitation separation of two polymers mixtures, purities of the obtained precipitate and supernatant fractions became high comparing with the case in which the unpurified polymers were used. Parts of the polymers which were not the precipitation targets were also precipitated by the separation procedures. This was caused not only by insolubilization of the non-targeted polymers due to their phase transitions but also by their non-specific entanglement with the targeted polymers. The purities of the fractions also improved when the difference of the phase transition temperature between two polymers was large enough to avoid the coprecipitation. In the case of the precipitation separation of mixtures of the three polymers, purities of each fraction also improved when the purified polymers were used.     

Synthesis of well-defined block copolymers and star-branched polymers by using terminal 1,3-butadiene functionalized polymers as reactive building blocks

Terminal 1,3-buadiene (Bd) functional polymers are stoichiometrically reacted with living anionic polymers in a monoaddition manner in THF at ?78 °C, but neither polymerization nor oligomerization occurs under the conditions. By utilizing this reactive but non-polymerizable character of the Bd function toward living anionic polymers, a variety of block copolymers and regular and asymmetric star-branched polymers were successfully synthesized. In these syntheses, the terminal Bd functionalized polymers work effectively as reactive building blocks, namely polymeric efficient linking agents, to construct such architectural polymers. Since all the polymer segments used for the syntheses were derived from living anionic polymers and the linking reactions quantitatively proceeded, the architectural polymers herein synthesized were well-defined in structure and were precisely controlled in chain length. A new protocol based on iterative approach by repeating a two reaction sequence involving linking reaction and re-introduction of Bd group was proposed and developed to successively synthesize asymmetric star-branched polymers up to a 6-arm ABCDEF type. The terminal Bd functionalized polymers were readily and quantitatively converted to anhydride or diepoxide functionalized polymers by Diels–Alder or oxidation reactions. Because of their high reactive termini, the resulting polymers are also usable as reactive building blocks to synthesize the core-functionalized star-branched polymers with carboxylic acids or hydroxyl groups. The reactions between terminal anhydride and amine functionalized polymers were carried out in bulk at 180 °C to examine the synthetic possibility of star-branched polymers under such conditions.     

耐盐性高吸水树脂的研究进展

综述了近年来国内外提高吸水树脂耐盐性的研究进展，概述了高吸水树脂的结构和吸水机理，归纳了引入亲水单体、降低树脂颗粒微环境的盐浓度等提高吸水树脂耐盐性的方法。     

Synthesis and studies of blue light emitting polymers containing triphenylamine‐substituted fluorene and diphenylanthracene moiety

Photoluminescent (PL) polymers containing triphenylamine‐substituted fluorene and diphenylanthracene (DPA) units were synthesized by aromatic nucleophilic substitution reaction. The light emitting polymers (LEPs) contains hole‐transporting triphenylamine (TPA) groups at the C‐9 position of fluorene and DPA‐emitting segments in the main chain. The obtained polymers were soluble in various organic solvents and thermally stable. The synthesized polymers were successfully characterized by elemental analyses, FTIR and, ¹H NMR spectroscopy. The electrochemical measurements and optical properties of the polymers were also studied. The obtained polymers showed significant blue emission. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011