聚合物/层状硅酸盐纳米复合材料的性能

取合物／层状硅酸盐纳米复合材料是近十年发展起来的一类新型材料，即使硅酸盐纳米填料的含量很低，一般在5％（wt）以下，就使该类材料具有许多优良的性能，如杨氏模量，储能模量，热稳定性，气体阻隔性及阻燃性等均有较大的提高。本文综述了该类材料的性能。     

无机金属聚合物合成及性能研究

本文报道了三类新型的无机金属聚合物—原子簇聚合物、金属配聚物和金属有机／金属配聚物的结构和性能。     

共轭聚合物复合材料的结构和性能

对聚苯胺、聚吡啶等共轭聚合物与非导电聚合物材料的复合体系的结构和性能进行了综述。不同方法制备的复合材料在结构和性能上各有特点。一般共轭聚合物与非导电高分子材料相容性差、尤其是低极性高分了。     

聚合物／金属复合物合成超导化合物的研究

使用聚合物/金属复合物(简称PMC)前体这一新型工艺,制备出单相态的超导化合物Y_1Ba_Cu_3O_x其工艺的累积时间比同类无机盐溶液法缩短60%,温度降低50℃～100℃,所得样品起始转变温度T_(c,始)=93.63K,零电阻温度T_(c零)=90.09K,转变宽度ΔT=0.5K。     

聚合物-金属纳米复合材料的制备与应用

综述了聚合物-金属纳米复合材料的制备方法，包括原位形成法、沉积法、离子注入法、辐射化学法、光照化学法、直接分散法、球磨法；介绍了聚合物．金属纳米复合材料的应用领域，最后展望了这种材料的发展前景。     

聚合物/石墨烯复合材料制备研究新进展及其产业化现状

对石墨烯及其聚合物基复合材料进行简单的介绍和分类,着重介绍了几种主要聚合物/石墨烯复合材的制备方法及其产业化应用研究情况,同时综述了聚合物/石墨烯复合材料最新的研究进展,评述了聚合物/石墨烯复合材料产业化状况及其发展过程中所面临的机遇与挑战.     

金属有机配位聚合物的合成

金属有机配位聚合物(金属聚合物)由于整合了金属和聚合物的诸多优点而在清洁能源、智能响应材料、高性能器件制备方面具有广泛的应用潜力。本文综述了近十年金属聚合物合成进展,主要从聚合物形成和金属中心引入的顺序,如先合成聚合物再引入金属中心、先合成含金属单体后引发聚合以及一步法合成金属聚合物等方面进行论述,重点介绍合成方法、金属聚合物链结构和性能之间的关系,分析了不同合成方法的优缺点,探讨了金属聚合物合成的研究趋势。     

含钐金属有机聚合物的合成及其荧光性质研究

以合成的含双键的烷氧钐单体，与甲基丙烯酸甲酯，苯乙烯等共聚，所得聚合物用红外光谱进行了表征，用高效液相色谱测定它们的分子量及其分布、着重比较研究了这些聚合物的荧光性质。     

金属纳米粒子/聚合物体系的稳定性及其机理

金属纳米粒子由于其小的尺寸和大的比表面积等特点,使其具有独特的热性能、电性能、磁性能和光性能,以及很强的团聚趋势。因此金属纳米粒子是否被稳定在纳米尺度内,是它们能否表现出独特性能的关键。本文综述了非离子聚合物、聚电解质、两亲聚合物、双亲水聚合物、树状聚合物对金属纳米粒子的稳定作用及其稳定机理的研究进展。     

聚苯硫醚/低熔点玻璃复合体系的熔融制备与力学性能

选取低熔点玻璃(LMTG)为无机组分,聚苯硫醚(PPS)为聚合物基体,在适宜的温度下熔融制备了复合体系(PPS/LMTG).探讨了加工工艺对体系中LMTG无机相形态的影响,研究了加工温度低于LMTG软化温度制备的普通填充体系(PPS/LMTG300)和高于软化温度制备的熔融液-液复合体系(PPS/LMTG400)的力学性能.结果表明,对于所选择的体系,可以在325~450℃内实现有机无机相液-液复合;温度场、剪切场均影响LMTG分散相的形貌,液-液复合过程中LMTG分散相液滴在剪切场中呈现类似变形、破裂、凝聚和松弛回复等特征;与普通填充体系PPS/LMTG300相比,由液-液复合得到的PPS/LMTG400体系中无机相在复合过程中原位生成平均粒径更小的形态,其粒子基体相互作用减弱;且经过液-液复合,粒子分散性得到了较大的改善,PPS/LMTG400体系中即使含量高达66 wt%,无机粒子仍然具有优良的增强效果.     

LMPM／PP复合材料的导电性能

通过挤出拉伸制备了ＬＭＰＭ／ＰＰ复合材料。测定了ＬＭＰＭ／ＰＰ复合材料的体积电阻率，并由此计算了复合材料对电磁波辐射的屏蔽效率。结果表明，复合材料导电的临界体积分数φｃ与ＬＭＰＭ的形态结构密切相关，ＬＭＰＭ越细，φｃ越低；当ＬＭＰＭ形成纤维后，φｃ更低。ＬＭＰＭ为０．１μｍ时，φｃ＝６％，再挤出拉伸时，φｃ＝２％。只有当φ〉φ，ＬＭＰＭ／ＰＰ复合材料对电磁波辐射才有屏幕作用，且屏蔽效率与（φ－φｃ     

In-line rheometry of polypropylene based Wood Polymer Composites

A completely satisfactory off-line rheological investigation of Wood Polymer Composites (WPCs) is very challenging at processing temperatures: when using rotational rheometry in oscillatory mode, the linear viscoelastic region is often too small, while in capillary rheometry the sieving effect of the fibres may invalidate the results. Moreover, all off-line tests present the risk of wood degradation.To this aim, an in-line extrusion rheometer (slit die) has been developed. The major advantages are that the measurements are made in real processing conditions and degradation problems are less severe thanks to reduced oxygen level inside the extruder barrel.In order to verify the methodology, tests have been conducted on a commercial polypropylene based WPC with 30 wt.% white fir fibres and compared with off-line measurements performed at a lower temperature on the same material. For comparison, a temperature shift factor has been used, that has been estimated by characterizing the polypropylene matrix alone.     

聚合物接枝纳米颗粒及其相容性共混物流变学

聚合物接枝纳米颗粒(Polymer grafted nanoparticles,PGNPs)是一类重要的聚合物改性填料。由于表面聚合物链的存在,在一定条件下,PGNPs可以均匀地分散在聚合物基体中,形成"完全相容性"聚合物纳米复合材料。近年来,PGNPs填充聚合物体系的结构-性能关系研究已成为高分子学科的研究热点。本文主要概述了PGNPs的制备及其填充聚合物体系的结构-性能关系。从PGNPs的设计制备、PGNPs在聚合物基体中的分散行为、PGNPs纳米复合体系流变行为和纳米复合材料力学性能4个方面介绍了该领域已经取得的研究进展和现状,并展望该领域今后的发展前景和研究方向。     

尼龙6/氯化钾复合材料的结晶与性能

通过熔融共混法制备了不同KCl含量下的尼龙6(PA6)/KCl复合材料,采用示差扫描量热仪(DSC)、流变仪、红外光谱(IR)、电子拉伸机等研究了KCl含量对PA6/KCl复合材料结晶行为、流变性能及力学性能的影响,并研究了其受限机制.力学性能研究结果表明,随着KCl含量的增加,PA6/KCl复合材料拉伸强度和冲击强度呈现出先增大后减小的趋势,在KCl含量为3 phr时,复合材料拉伸强度和冲击强度分别达到最大值82.67 MPa和7.34 k J/m~2,较纯PA6分别增加了10.8%和34.68%,动态力学性能测量结果表明,在测量温度范围内,复合材料的储能模量均高于纯PA6,在25℃体系储能模量(G')随KCl含量的增加而增大,复合体系抵抗弯曲变形能力增加,而结晶行为研究结果表明,增加KCl的含量,PA6/KCl复合材料的成核温度、晶体生长温度、熔融温度及玻璃化转变温度均向低温方向移动,成核密度和成核速率也逐渐减小,结晶能力下降,结晶度减小,结晶度由原来25.30%变为19.34%,而结晶诱导时间逐渐增加.流变性能研究结果表明,随着KCl含量的增加,复合体系的零剪切黏度逐渐增加,且所有的体系均呈现出假塑性流体行为,剪切变稀现象越来越明显,特征松弛时间τ_1、τ_2和τ_3逐渐增加,复合体系的松弛机制发生变化.     

Network Polymer Properties Engineered Through Polymer Backbone Dispersity and Structure

Dispersity (Ð or M_w/M_n) is an important parameter in material design and as such can significantly impact the properties of polymers. Here, polymer networks with independent control over the molecular weight and dispersity of the linear chains that form the material are developed. Using a RAFT polymerization approach, a library of polymers with dispersity ranging from 1.2—1.9 for backbone chain-length (DP) 100, and 1.4—3.1 for backbone chain-length 200 were developed and transformed to networks through post-polymerization crosslinking to form disulfide linkers. The tensile, swelling, and adhesive properties were explored, finding that both at DP 100 and DP 200 the swelling ratio, tensile strength, and extensibility were superior at intermediate dispersity (1.3—1.5 for DP 100 and 1.6—2.1 for DP 200) compared to materials with either substantially higher or lower dispersity. Furthermore, adhesive properties for materials with chains of intermediate dispersity at DP 200 revealed enhanced performance compared to the very low or high dispersity chains.     

Mechanical properties of polyamide-12 layered silicate nanocomposites and their relations with structure

The mechanical properties of polyamide-12/Cloisite 30B (PA12/C30B) nanocomposites prepared by melt compounding were studied as a function of clay volume fraction φ under various processing conditions. All measured mechanical characteristics, Young's modulus, yield stress, strain at break and stress at break, exhibit a transition at φ_p1%, identified with a percolation threshold. Also, the linear and non-linear mechanical properties appeared to depend on the degree of exfoliation of the structure, which can be tuned by the processing conditions. The three-phase Ji's theoretical model was used to predict Young's modulus as a function of clay concentration, focusing on the influence of the degree of exfoliation. Experimental yield stress data were fitted to Pukanszky's model and discussed in terms of PA12/C30B interfacial adhesion.     

颗粒填充聚合物高介电复合材料

颗粒填充聚合物高介电复合材料兼具聚合物材料的易加工、低损耗、耐击穿性能和陶瓷材料的高介电等性能,还可使金属材料具备介电性能,可以广泛应用于电气、电子行业。本文综述了非均匀体系介电理论研究的历史背景,以及陶瓷、金属颗粒填充聚合物高介电复合材料的组成、制备及介电性能的影响因素,并着重讨论了界面相在复合材料研究中的重要性,最后展望了发展方向。     

Dielectric Properties of Polymer Composites Filled with Different Metals

Electrically conductive composite systems based on polyvinyl chloride (PVC) and polymethyl methacrylate (PMMA) filled with metal powders of Al and Cu have been studied. The composite preparation conditions allow the formation of a random distribution of metallic particles in the polymer matrix. Dependence of the dielectric and conductivity properties of the PVC and PMMA/fillers was studied over a broad range of frequency and volume fraction of metal fillers. The experimental results could be explained by means of the conductivity of fillers and the interface polarization between polymers and fillers. Percolation was also seen in this study when the volume fraction of conducting fillers was close to critical value, in which the composites undergo an insulator‐conductor transition. The relation among the dielectric property and the fillers with different conductivity was proposed.     

复合,多孔PVDF-HFP聚合物电解质膜的制备及其性能研究

采用溶剂/非溶剂方法—即相转移法制得PVDF＿HFP微孔膜,比较了DMC,DEC和PC等3种增塑剂的制孔作用.结果表明:DEC最好,DMC次之,而PC效果最差.聚合物的导电率为1.86×10-3Sm-1(LiPF6＿1mol/L;EC/DMC:1/1wt).     

针对工科专业的高分子材料流变学教学实践和体会

高分子材料流变学对高分子加工工艺、成型设备以及模具的设计具有至关重要的指导意义,是高分子材料相关专业的必修基础课程.本文简介了流变学的发展概况和在青岛科技大学的开课情况,并总结了作者在工科专业学生的教学实践中针对具体内容的教授技巧与经验,提出针对本科阶段的学生应该着重介绍流变学的基础知识和基本原理,并注重理论和实践的有...