磷酸盐玻璃载银抗菌PP复合材料的性能研究

对以磷酸盐玻璃载银抗菌剂制备的聚丙烯复合材料进行了性能研究。实验结果表明,当抗菌剂粉体的添加量为PP的2‰时,抗菌率就能达到99%以上,制备出的抗菌PP塑料具有优异、长效的抗菌性能。添加抗菌母粒制备抗菌塑料的方法能够使抗菌剂集中并均匀的分散在基体树脂的表面,并对基体树脂的力学性能不会产生明显的影响。     

长链α-烯烃在有机硅产品中的应用

长链烷基的引入赋予了有机硅产品更好的脱模、润滑、消泡等特殊性能,获得了广泛应用。该文系统地介绍了长链烷基硅烷偶联剂、长链烷基硅油及二次加工品的合成及用途,并对其应用前景进行了展望。引文11 篇。     

Effects of perfluoroether concentration and curing protocol on morphology and mechanical properties of toughened TGDDM/MNA resin systems

Previous published work has shown that hydroxyl terminated perfluoroether oligomers can be suitably modified and functionalised to make them miscible with epoxy resins in the uncured state. The reaction conditions can adjusted to induce phase separation either through spinodal decomposition to produce an IPN type morphology, or by nucleation and growth if a dispersed-particle microstructure is required.In the present work we examine the relative toughening enhancement efficiency of the two possible heterophase morphologies. Both systems show a sigmoidal increase in fracture toughness, with increasing concentration of the perfluoroether modifier. However, this takes place at much lower modifier concentrations for the systems with a particulate morphology (about 3.5% w/w) than for IPN systems (about 7.5% w/w). The maximum fracture toughness achievable for the two systems, on the other hand, is very similar and coincides with the concentration at which co-continuous phases are formed.These differences in morphology, however, are not reflected in the variation of modulus and compressive yield strength with increasing concentration of perfluoroether modifier, in so far as both systems exhibit a gradual and small reduction in property with increasing concentration. Furthermore, the dynamic mechanical spectra of the two systems are very different, but the changes resulting from increasing the concentration of toughening agent are relatively small in either case.Nanoindentation tests indicate that it is the local plasticity, brought about by the presence of the softer perfluoroether phase, which is responsible for the enhancement of fracture toughness. This is corroborated by AFM examinations, which reveal local plastic deformations in the regions surrounding the softer particles.     

基于知识情感等级BDI主体的决策行为模型研究

为了将知识、信念、愿望和意图以及害怕、焦虑和自信对决策行为的影响的强烈程度进行形式化,把无穷值的卢卡斯维茨逻辑的真值取值范围从[0,1]扩展到[-1,1]。知识情感等级BDI主体的决策行为通过添加了具体条件的不同背景的不同测度来决定;知识情感等级BDI主体模型清晰地表示了主体的知识状态、心智状态和情感状态的不确定性;此模型可以轻易地向其他类型的主体进行推广。在给出了知识情感等级BDI模型的语言、语义以及此模型的不同背景之间的相互关系之后,对知识情感等级BDI主体的军事决策行为进行了实例分析。此研究旨在为分布式人工智能和军事仿真提供形式支持。     

Effect of randomization on the oxidative stability of corn oil

Randomized corn oil TAG oxidized much faster than natural oil, but after purification with alumina, they oxidized at the same rate. We showed that this effect could not be attributed to a difference, in total tocopherols in the randomized and natural oils. Polar material recovered from the alumina treatment was fractionated by TLC, and a pro-oxidant effect was found in the fractions containing MAG and DAG. However, MAG and DAG, although mild pro-oxidant could not account for the pro-oxidant effect generated by randomization. No other compounds could be detected in the MAG fraction by MS. The pro-oxidant effect of randomized oil disappeared when EDTA or citric acid was added in sufficient amounts. The pro-oxidant effect of randomized corn oil was increased by the incorporation of additional copper or iron at a concentration that did not catalyze oxidation of the purified oil. Treatment of corn oil with ascorbic acid, ascorbyl-6-palmitate, ethyl acetoacetate, ethyl diacetoacetate, and acetylacetone did not reproduce the effect of the unknown pro-oxidant. Although the identity of the pro-oxidant is still unknown, we have confirmed that it is produced during randomization; it does not have pro-oxidant activity alone, but it facilitates the catalytic activity of the transition metal ions.     

木塑复合材料的霉腐真菌危害及防霉抗菌剂的应用进展

木塑复合材料(WPCs)是近年来广泛应用的一种新型复合材料,兼有木材和高分子材料二者的优点,但同时也存在一个很大的弊端:易受霉腐真菌的危害。本文主要介绍了霉腐真菌对WPCs的危害情况及防霉抗菌剂的开发生产情况,同时简要阐述了防霉抗菌剂的发展趋势,最后指出开发防霉抗菌剂的必要性和重要性。     

选择性螯合滴定法测定电镀液中的锡铜铅

提出了测定电镀液中锡铜铅的一个简易快速螯合滴定法.用EDTA螯合锡(Ⅳ)、铜(Ⅱ)、铅(Ⅱ)和其它金属离子,然后分别用三羟基苯甲酸、巯基丁二酸和氨荒丙酸解蔽.释放出的EDTA,用锌标准溶液反滴定(XO-CPB为混合指示剂).终点变化相当敏锐.研究了测定锡、铜、铅时一般共存离子的干扰.此法已被成功地用于测定锡-铜-铅合金电镀液和镀层锡铜铅合金中的锡、铜和铅.     

化学还原法制备Ag-TiO2光催化抗菌材料的研究

选用平均粒径分别为30nm和8μm的二氧化钛为原料,利用化学还原法制得银质量分数为0. 7% ~5%的Ag-TiO2光催化抗菌材料,采用抑菌圈试验对其抗菌性能进行研究,通过光催化降解亚甲基蓝实验研究了二氧化钛载银前后光催化活性的改变。结果表明,负载1% (质量分数)银的平均粒径为30nm的二氧化钛经250℃热处理后具有良好的抗菌性,其催化活性没有改变。     

Characteristic properties of cutting fluid additives derived from the adducts of diamines and acid chlorides

A number of N,N′-diacylalkyldiamines were prepared from the reaction of acid chlorides with 1,8-diaminooctane and 1,12-diaminododecane and screened for anti-rust properties and antimicrobial activity in spent coolants of water-based cutting fluids. Aqueous solutions of N,N′-dihexanoyl-1,8-diaminooctane and N,N′-isobutyroyl-1,12-diaminododecane showed good anti-rust properties for water-based cutting fluids. Aqueous emulsions of N,N′-dibutyroyl-, dipentanoyl-, dihexanoyl- and dioctanoyl-1,12-diaminododecane showed good lubricities and antimicrobial activity for water-based cutting fluids.     

Natural fiber composites of high‐temperature thermoplastic polymers: Effects of coupling agents

Our earlier paper (Jana, S.C.; Prieto, A. J Appl Polym Sci 2002, 86, 2159) on the development of natural fiber composites of high‐performance thermoplastic polymers described a new methodology for the manufacturing of composite materials of a high‐temperature thermoplastic polymer, poly(phenylene ether) (PPE) and wood flour, a cellulosic natural filler. A thermosetting epoxy, used as a reactive solvent, reduced the processing temperature of PPE/epoxy blends to well below the decomposition temperature of natural fillers. In addition, the epoxy component, upon polymerization, formed coating layers around the filler particles to provide resistance against moisture diffusion and attacks by acids and alkali. This article describes the results of an investigation on two outstanding issues: (1) the influence of cellulosic wood particles and coupling agents on the speed of epoxy curing and reaction‐induced phase separation and (2) the effects of coupling agents on the morphology of crosslinked epoxy at the surfaces of natural fillers and mechanical properties of the composites. It was found that wood particles expedited epoxy curing in the composites; the extent of epoxy curing, however, was reduced in the presence of coupling agents. Also, the coupling agents promoted complete coverage of wood flour particles by polymerized epoxy, although the mechanical properties deteriorated over systems without coupling agents. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2168–2173, 2002