溶剂法聚苯乙烯/粘土纳米复合材料的研究

介绍了采用大分子溶液直接插层有机粘土制备聚苯乙烯／粘土纳米复合材料合成技术．实验结果表明：聚苯乙烯大分子链在柠烯溶液中有着极好的溶剂化作用，与改性有机粘土能够发生有效插层作用，同时粘土剥离物增强材料可以纳米级尺寸均匀分布在聚合物基体．阐述了插层剂选择及有关阳离子表面活性剂分子修饰原则及合成原理以及重点讨论了聚合物溶液直接插层原理及热力学条件和影响因素。     

聚合物-粘土纳米复合材料

介绍了用于聚合物-粘土矿物纳米复合材料的蒙脱石的基本结构、性能和纳米化原理，报道了蒙脱石的有机改性方法和层间扦入方法，评述了该复合体系的研究进展.     

聚合物/无机纳米复合材料的应用及其制备研究

聚合物和无机物在纳米及分子级水平上的复合,将充分发挥各自的优势。聚合物/无机纳米复合材料的研究已成为当今化学、物理和材料等许多学科的前沿领域,显示出重要的科学意义和良好的应用前景。简要综述了聚合物/无机纳米复合材料的应用及其制备研究的现状。     

聚丙烯/累托石层状硅酸盐纳米复合材料制备及力学性能研究

用有机累托石与聚丙烯溶液聚合制备复合材料母料,然后在双螺杆混炼挤出机上用熔融插层聚合的方法制备聚丙烯/累托石层状硅酸盐纳米复合材料,研究了复合材料的力学性能并用扫描电镜(SEM)对纳米复合材料进行表征.结果表明:累托石均匀分散到聚丙烯基体中,改善了聚丙烯的力学性能.     

尼龙6、尼龙66/粘土纳米复合材料的制备和性能

文章综合近年来国内外关于尼龙/粘土纳米复合材料的文献,详细论述了尼龙/粘土纳米复合材料的制备方法和性能。     

Polymer nanocomposites

The synthesis of polymer nanocomposites is an integral aspect of polymer nanotechnology. By inserting the nanometric inorganic compounds, the properties of polymers improve and hence this has a lot of application depending upon the inorganic material present in the polymers. Solvent casting is one of the easiest and less time consuming methods for the synthesis of polymer nanocomposites. In this article we present different types of polymer composites, methods of synthesis, characterisation techniques and different applications of polymer composites. A Lagashetty is Head, Department of Engineering Chemistry, Appa Institute of Engineering and Technology, Gulbarga, Karnataka. His research interests are synthesis, characterization and applications of nanomaterials and polymer nanocomposites. A Venkataraman is Head, Department of Materials Science, Gulbarga University, Gulbarga. His research interests are nanomaterials, nanomaterials as sensors, polymer synthesis and polymer nanocomposites.     

Fe3O4/PPy纳米复合材料制备的研究进展

Fe3O4/PPy纳米复合材料是一种兼有无机纳米磁性材料与导电聚合物两者优异性能于一体且极具应用潜力的新材料,在传感器、电磁屏蔽、生物医药、离子交换树脂等领域普遍关注。本文综述了Fe3O4与聚吡咯纳米复合材料的制备方法,包括溶胶-凝胶法、原位聚合法、电化学合成法、自组装法以及超声法,分析了各种制备工艺的优劣,并指出了Fe3O4/PPy纳米复合材料的发展趋势。     

Solution to 1-D consolidation of non-homogeneous soft clay

In this work, semi-analytical methods were used to solve the problem of 1-D consolidation of non-homogeneous soft clay with spatially varying coefficients of permeability and compressibility. The semi-analytical solution was programmed and then verified by comparison with the obtained analytical solution of a special case. Based on the results of some computations and comparisons with the 1-D homogeneous consolidation (by Terzaghi) and the 1-D non-linear consolidation theory (by Daviset al.) of soft clay, some diagrams were prepared and the relevant consolidation behavior of non-homogeneous soils, is discussed. It was shown that the result obtained differs greatly from Terzaghi’s theory and that of the non-linear consolidation theory when the coefficients of permeability and compressibility, vary greatly.     

聚β-羟基丁酸PHB/蒙脱土纳米复合材料的结构与力学性能

用溶液复合法成功地制备了插层型PHB/蒙脱土纳米复合材料.采用X射线衍射(XRD)和透射电子显微镜(TEM)研究了复合材料的结构,发现硅酸盐片层间距从1.8 nm升至 2.4 nm左右.同时研究了复合材料的结晶,熔融,和力学性能,发现有机蒙脱土的加入,可以加快PHB的结晶速度,降低熔融温度,提高了材料的力学性能,有机蒙脱土含量在3%时,其综合性能最佳.     

掺杂稀土La的Fe-Co合金/石墨纳米复合物的室温磁性能研究

以水热法制备的掺杂不同量稀土La的铁钴合金/钴铁氧体纳米复合物为前驱体,通过与三聚氰胺在高纯氮气氛中发生固相反应合成出掺杂稀土La的Fe-Co合金/石墨纳米复合物。XRD表征结果显示,La与Fe,Co形成了体心立方(bcc)结构的合金;由TEM,HRTEM观察出,掺杂La的Fe-Co合金纳米颗粒尺寸范围为200⁵00nm,且被石墨层包覆;VSM室温磁性能测试结果说明,掺杂La的Fe-Co合金/石墨纳米复合物的饱和磁化强度随着La的掺杂量的增大先减小后增大,而矫顽力先增大后减小。     

PET／SiO2纳米复合材料的力学性能与摩擦性能研究

简要介绍了用原位聚合合成PET及PET／SiO2纳米复合材料的方法,并对合成材料的力学性能和摩擦性能进行了研究。研究表明：PET／SiO2纳米复合材料的拉伸强度、冲击强度、弯曲强度等较纯PET有较大提高。当SiO2含量为2％时,复合材料的拉伸强度、弯曲强度分别比纯PET提高26．4％、25．2％,当SiO2用量为1％时,其冲击强度是纯PET的1-31倍。PET／SiO2纳米复合材料比纯PET具有较好的耐磨性。     

真空预压技术加固海堤深厚软基原型试验研究

真空荷载提供了一种减少堤坝软土地基固结时间的选择. 本文开展了一个海堤全断面的试验及原型观测研究. 试验堤高5. 5 m, 22 m深且三角形布置的塑料排水板作为竖向排水通道, 现场布置了水平测斜和沉降仪等观测仪器, 埋设在不同地基深度的孔隙水压力计用来量测真空-堆载联合荷载下的地基中超静孔隙水压力的变化. 通过场地条件分析、高真空度维持和真空卸载, 得到了系统的沉降变形和孔隙水压力资料, 试验结果验证了真空-堆载联合预压加固海堤软土地基的效果.     

SiO2为壳层材料的纳米复合材料的研究进展

SiO2具有许多特性，用其作壳层材料来制备核-壳结构的纳米复合材料可以使其具有更多的特殊性质。本文综述了SiO2包裹磁性纳米粒子、量子点以及贵金属纳米粒子的研究进展。     

新课程改革背景下的中小学泥塑课教学

随着泥塑课作为课改内容走进中小学课堂,这种最能体现课改理念,创作最自由,学生最喜欢,最能充分发挥学生想象力、创造力和立体造型能力的课程,受到所有中小学生们的欢迎。     

替代紫木节复合原料研究

通过优选复合方案、选择原料预处理工艺、调整泥浆性能,实现了复合粘土原料化学组成、颗粒组成与紫木节一致,保证了复合粘土可塑性及泥浆性能均达到或超过紫木节各项性能指标。试验结果表明:以长白山高岭土81.3wt%,苏州土4.1wt%,东北黑泥12.2wt%,龙岩土2.4wt%复合使用最佳,复合粘土原料注浆泥的比重、细度、流动性、稳定性基本与紫木节一致,厚化度略有减小,有利于泥浆的输送和注浆成型操作;坯体的收缩率减小,大大降低坯体变形、开裂的可能性;生坯干燥强度提高,有利于提高成品率;复合原料杂质含量低,烧后坯体白度提高。     

装饰陶艺课程教学的探索与实践

高职教育随着经济的发展和社会的进步呈现新的趋势,现代陶艺正朝着多元化、多层面的方向良性发展。陶艺教学不应只围绕着陶艺创作来进行,如何继承、发展、创新是摆在教学中的首要问题,因为创新是陶艺创作的灵魂,同时进行产学研结合,会使高职陶艺教学更加完善。     

平衡法表征对苯二胺分子印迹聚合物的分子识别性能

采用非共价分子印迹技术,以对苯二胺（p-PD）为模板分子,甲基丙烯酸为功能单体,制备了p-PD分子印迹聚合物,并利用静态平衡法研究了印迹聚合物的结合能力和选择性。结果表明,在印迹聚合物中存在两类结合位点,离解常数分别为2．57×10^-4mol／L和3．71×10^-3mol／L;对应的最大结合位点数分别为19．7μmol／g和80．7μmol／g;p-PD印迹聚合物能够选择性结合p-PD。     

成都裂隙性黏土流变特性试验

以成都裂隙性黏土为对象,进行一系列室内试验,探讨了成都裂隙性黏土的流变特性。通过三轴固结不排水蠕变试验,得到不同围压下各级偏应力水平的全过程蠕变曲线和应力—应变等时曲线,对试验结果做了讨论,并建立了蠕变方程。其中应变—时间关系采用伯格斯模型,应力—应变关系采用指数函数的蠕变方程,拟和曲线与试验曲线很好的吻合,较好地表达了土体的应力—应变—时间关系。     

An efficient parameter identification procedure for soft sensitive clays

The creep and destructuration characteristics of soft clay are always coupled under loading, making it difficult for engineers to determine these related parameters. This paper proposes a simple and efficient optimization procedure to identify both creep and destructuration parameters based on low cost experiments. For this purpose, a simplex algorithm (SA) with random samplings is adopted in the optimization. Conventional undrained triaxial tests are performed on Wenzhou clay. The newly developed creep model accounting for the destructuration is enhanced by anisotropy of elasticity and adopted to simulate tests. The optimal parameters are validated first by experimental measurements, and then by simulating other tests on the same clay. Finally, the proposed procedure is successfully applied to soft Shanghai clay. The results demonstrate that the proposed optimization procedure is efficient and reliable in identifying creep and destructuration related parameters.     

Clay modeling versus written modules as effective interventions in understanding human anatomy

The effectiveness of clay modeling to written modules is examined to determine the degree of improvement in learning and retention of anatomical 3D relationships among students with different learning preferences. Thirty‐nine undergraduate students enrolled in a cadaver dissection course completed a pre‐assessment examination and the VARK questionnaire, classifying learning preference as visual, auditory, read/write, or kinesthetic. Students were divided into clay, module, and control groups with preference for learning style distributed among groups. The clay and module groups participated in weekly one‐hour classes using either clay models or answering written questions (modules) about anatomical relationships, respectively. The control group received no intervention. Post‐assessment and retention examinations were administered at the end of the semester, and three months later, respectively. Two variables (Δ1, Δ2) represented examination score differences between pre‐ and post‐assessment and between post‐assessment and retention examinations, respectively. The Δ1 for clay and module groups were each significantly higher than controls (21.46 ± 8.2 vs. 15.70 ± 7.5, P ≤ 0.05; and 21.31 ± 6.9 vs. 15.70 ± 7.5, P ≤0.05, respectively). The Δ2 for clay and module groups approached but did not achieve significance over controls (?6.09 ± 5.07 vs. ?8.80 ± 4.60, P = 0.16 and ?5.73 ± 4.47 vs. ?8.80 ± 4.60, P = 0.12, respectively). No significant differences were seen between interventions or learning preferences in any group. However, students of some learning styles tended to perform better when engaging in certain modalities. Multiple teaching modalities may accommodate learning preferences and improve understanding of anatomy. Anat Sci Educ. © 2013 American Association of Anatomists.