无机化合物对填充PE薄膜性能影响的研究

以CaCO3、BaSO4、滑石粉为填料,以低密度聚乙烯(LDPE)为基体,通过共混、挤出工艺制得无机填充母粒,将填充母粒与LDPE、线性低密度聚乙烯(LLDPE)按一定比例混合,通过吹塑成型获得不同无机填料改性聚乙烯(PE)薄膜,并对其力学性能和光学性能进行了测试和分析.结果表明,CaCO3、BaSO4、滑石粉质量分数低于15%时,能增加PE薄膜的拉伸强度,而且BaSO4、滑石粉改性PE薄膜的光学性能比CaCO3改性PE薄膜效果好.     

高透气聚乙烯流延薄膜专用树脂的研究

采用低密度聚乙烯与无机矿物填料为主要材料,通过偶联处理、增容、共混改性工艺制成高透气聚乙烯流延薄膜专用树脂。该专用树脂耐热温度大于等于280℃,熔体流动速率大于2 g／10 min。无机矿物填料质量分数大于58％。拉伸比为2．2时,流延薄膜透气量达6202g/(24 h·m2),力学性能和卫生性能满足使用要求。     

纳米无机填料改性酚醛树脂基防热复合材料烧蚀性能研究现状

树脂基体中共混纳米无机填料是提高酚醛树脂基复合材料烧蚀性能的一种有效途径,无机填料与酚醛树脂共混改性制备复合材料的工艺简单、成本低、改性效果明显,已成为重要的研究方向。本文对无机填料特别是纳米无机填料改性酚醛树脂基烧蚀材料的烧蚀性能研究进行了梳理,并对多种纳米填料改性复合材料的烧蚀机理研究进行总结归纳。     

低密度聚乙烯薄膜中的无机填料

使用填料是塑料改性的有效方法,近年来由于塑料原料价格上升及复合技术的进展,因而增加了对填料与聚乙烯复合物的兴趣。本文概述了填料对聚乙烯性质影响方面的有关文献,并研究了不同的无机填料如:滑石粉、云母、粘土、硅灰石和碳酸钙等对低密度聚乙烯(LDPE)薄膜各性能的影响,对于薄膜的大多数性能来说,填充精细的滑石粉比使用其他填料好。片状的滑石粉能使薄膜的氧气透过性下降80%,并使水蒸汽的穿透速率也降低70%。填充滑石粉、粘土和碳酸钙填料可使薄膜的屈服强度上升,但随着填料用量的增加,不管使用何种填料都使薄膜的断裂拉伸强度下降。特別在填料含量高时(超过30%),断裂伸长率和撕裂强度低下,薄膜呈现脆性。所有填料都能明显降低磨擦系数和改善印刷性能,但对LDPE热熔合性的影响却很小。     

PI复合纳米含钛化合物薄膜的研究现状

聚酰亚胺（PI）存在介电损耗较高、储能密度较低、难加工成型等缺陷,需要引入无机纳米材料以改性优化PI。文章综述掺杂纳米含钛化合物对PI薄膜的影响,通过阐述二氧化钛、钛酸钡和钛酸铜钙等在PI复合薄膜中的作用,分析这些含钛化合物改性PI薄膜面临的问题和改进办法。目前PI薄膜着重合成工艺改进、填料改性等方面。未来可深入研究填料形貌和维度对PI复合薄膜的影响,引入柔性结构降低PI刚性,开发多层PI薄膜。     

淀粉——聚乙烯降解体系的分析与设计

研究了淀粉-聚乙烯降解体系中相容剂、增塑剂对材料力学性能的影响,分析了淀粉的填料特性以及与普通无机填料的区别,讨论了淀粉在加工过程中发生的变化,为得到较高机械性能的淀粉-聚乙烯降解材料提供了途径。     

纳米SiO_2对聚乙烯醇/淀粉熔融吹塑薄膜性能的影响

用甘油和水为增塑剂对高醇解度聚乙烯醇和玉米淀粉复配增塑改性,并选用不同的纳米SiO2,对聚乙烯醇/玉米淀粉基体进行纳米改性,熔融吹塑制备聚乙烯醇/玉米淀粉/纳米SiO2薄膜。结果表明:加入纳米SiO2后,聚乙烯醇/玉米淀粉/纳米SiO2薄膜的拉伸性能显著提高,热性能也发生了较明显的变化;探讨了纳米SiO2对薄膜性能影响的机理。     

不同维度纳米填料改性氯化聚乙烯橡胶的研究进展

综述纳米二氧化硅、碳纳米管、石墨烯等多种不同维度纳米填料改性氯化聚乙烯橡胶的研究进展。介绍利用不同填料改性氯化聚乙烯橡胶的机理及改性后氯化聚乙烯橡胶的应用概况,提出不同填料改性氯化聚乙烯橡胶的性能优化和应用的展望。     

填充母料增强聚烯烃耐候性的研究进展

综述了填充母料增强聚乙烯和聚丙烯耐候性的改性方法,分析了聚烯烃的老化机理,各种填料和助剂的改性机理、组成、制备方法和改性效果.采用无机填料(如氧化钛、氧化锌、氧化硅)填充聚烯烃,填充后聚丙烯/氧化钛的抗紫外光老化性能最好,与纯PP相比,老化144 h后的断裂伸长率保持率在波长为340,313 nm紫外光中分别提高了31...     

用于合成树脂仿真幕墙装饰系统抛光腻子的研究进展

本文主要从树脂类型、无机填料、助剂等方面研究了溶剂型腻子的性能和影响因素,着重综述了无机填料改性的机理和方法,从而得出改性无机填料是提高溶剂型腻子性能的重要方法.     

超高相对分子质量聚乙烯的耐磨性改性研究进展

综述了近年来超高相对分子质量聚乙烯(PE-UHMW)耐磨性改性的研究进展,介绍了物理共混改性法(无机填料填充和聚合物共混)和化学改性法(交联和等离子体处理)在PE-UHMW耐磨性改性方面的应用,讨论了各种改性方法对其耐磨性改性的改性机理和改性效果,并对PE-UHMW耐磨性改性的发展趋势作了展望。     

Weathering of starch–polyethylene composite films in the marine environment

Polyethylene and starch–polyethylene composite films were exposed outdoors in the straw-line of a marsh and in sea water on flow-through seatables in the laboratory. The deterioration of these films following exposure was measured by determining changes in tensile properties, weight loss, starch loss, and carbonyl content of the sheet plastic films. Low rates of deterioration were observed for control and starch–polyethylene composite films submerged in sea water. In contrast, both starch–polyethylene composite and control polyethylene films rapidly deteriorated during exposure in the strawline of a marsh. Differences in the observed rate of deterioration of the films placed in the exposure sites is attributed primarily to photodegradation of the films placed in the strawline of a marsh. © 1993 John Wiley & Sons, Inc.     

聚丙烯填充改性研究进展

介绍了聚丙烯填充材料的种类特点．综述聚丙烯的填充改性的研究．指出了聚丙烯填充改性的发展趋势。     

聚合物纳米复合材料的制备方法

从纳米微粒的分散方法以及纳米复合材料的成型技术两方面综述了国内外纳米复合材料的制备方法的发展状况,总结了纳米微粒填充法与紫外光辐射固化技术的结合在制备纳米复合材料方面的几种优点,认为该方法是未来聚合物无机纳米复合材料的主要、新型制备方法。     

Microvia filling by copper electroplating using diazine black as a leveler

An organic additive, Diazine Black (DB), was employed as a leveler for microvia filling using copper electroplating. DB is a derivative of Janus Green B (JGB), which is a common leveler used for copper fill of submicron or micron circuit metallization in electronic products. This study determined the optimal DB concentration for achieving the best filling performance. The electrochemical behavior of DB and its interaction with other additives, such as a suppressor and an accelerator were characterized using galvanostatic measurements. These electrochemical analyses helped explaining the filling mechanism of the plating formula containing the DB. Various surface morphologies and the crystalline orientation of the plated copper films caused by different DB concentrations were characterized by a scanning electron microscope (SEM) and X-ray diffraction (XRD), respectively. The corresponding chemical activity of the surface atoms of the plated copper films caused by different DB concentrations was characterized using a test of etching rate.     

聚甲醛的摩擦学改性研究进展

综述了近年来聚甲醛（POM）摩擦学改性的各种方法及其摩擦磨损性能与机理。重点讨论了聚合物共混、无机粒子填充、添加润滑剂、添加金属粉末、纤维增强、多元复合以及化学改性对聚甲醛复合材料摩擦磨损性能的影响。     

Effect of propylation of starch with different degrees of substitution on the properties and characteristics of starch‐low density polyethylene blend films

Corn starch was modified by propylation and degree of substitution (DS) of four starch modifications were 0.61, 1.56, 2.27, and 2.51. Different films were prepared by blending native and propylated starch with low‐density polyethylene (LDPE). The mechanical properties, thermal properties, water absorption capacity, and biodegradability of the blend films varied with the quantity of starch as well as DS. Tensile strength, elongation, and melt flow index of propylated starch blend films were higher compared to the corresponding native starch blend film. These properties improved with increase in DS from 1.56 to 2.51. Propylated starch blend films were found thermally stable than native starch blend films. There was a decrease in water absorption capacity for the films containing propylated starch at high DS. Enzymatic and soil burial degradation results showed that biodegradability of starch‐LDPE films increased with the increase in the starch concentration but it decreased with increase in the DS. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011.     

碳酸钙和淀粉对聚乙烯薄膜降解性能影响研究

目的:研究淀粉和CaCO3对塑料薄膜的降解影响。方法:将CaCO3填充膜和淀粉填充膜经自然曝露、紫外线照射和土埋处理,测试拉伸强度、断裂伸长率和分子量的变化。结果:自然曝露30d,CaCO3填充膜和淀粉填充薄膜的平均拉伸强度分别下降80.8%和54.4%,平均断裂伸长率分别下降99.4%和98.3%,分子量分别下降25.3%和13.8%;紫外光照120h,CaCO3填充薄膜和淀粉填充薄膜的平均拉伸强度分别下降14.7%和45.9%,断裂伸长率分别下降97.3%和97.0%,分子量分别下降66.7%和48.3%;土埋203d,CaCO3填充薄膜和淀粉填充薄膜的失重率分别为2.2%和15.0%。结论:CaCO3和淀粉均能加速聚乙烯塑料薄膜的降解,其中CaCO3的光降解性能方面优于淀粉,而淀粉的生物降解性能优于CaCO3。     

Influence of Cationic Starch Adsorption on Fiber Flocculation

The adsorption of cationic starch on hardwood fibers and its influence on flocculation were studied in relation to the dosage of cationic starch, the effect of shear forces and the presence of different concentrations of inorganic salts in the paper stock. Flocculation was monitored by means of a focused beam reflectance measurement (FBRM) probe. It was established that floc size at low shear rates depends on adsorption efficiency. At high shear forces, flocs were irreversibly decomposed despite the presence of a higher amount of adsorbed cationic starch on the fibers. Therefore, flocculation was produced by a bridging mechanism. The results show a significant effect of inorganic salts on the adsorption of cationic starch on fibers. Low concentrations of inorganic salts usually improved the adsorption process while higher concentrations (> 0.01 mol/L) reduced the adsorption and limited the flocculation process.