Acyl-chloride functionalized graphene oxide chemically grafted with hindered phenol and its application in anti-degradation of polypropylene

In this study,graphene oxide (GO) nanosheets were first functionalized by the acyl-chloride reaction and then reacted with hindered phenol (HP) to obtain HP grafted GO (GO-g-HP).The GO-g-HP prepared under the optimized condition exhibited a high efficiency against both thermal and photo oxidation of isotactic polypropylene (iPP).GO-g-HP exhibited a much better anti-aging efficiency than that of HP and GO used individually or that of their physical mixture.The outstanding anti-aging effect of GO-g-HP was attributed to the excellent synergistic effect produced between the chemically bonded GO and HP,which resulted in an improved oxygen barrier property of GO and excellent utilization of the free radical scavenging capability of GO and HP.Also,thanks to the grafting of HP on GO,the physical loss of HP,which was one of the main shortcomings for traditional small molecular antioxidants,was largely suppressed.It is expected that the GO-g-HP prepared can well meet the requirement of long-term applications of polymers in some harsh service conditions.     

富马酸烷·3-PG酯抗氧化和防霉性能

在对没食子酸丙酯 (PG)的抗氧化活性、富马酸酯的防霉活性进行分析和预测的基础上 ,对其分子结构进行改造 ,设计出一类新型化合物———富马酸烷·3-PG酯 .对五种目标产物进行抗氧化和防霉性能测试的结果表明 ,它们均同时具有与没食子酸丙酯相当的抗氧化性能和与富马酸二甲酯相当的防霉性能 ,打破了以往抗氧化剂和防霉剂需分别添加的传统     

有机化学中烷基的电子效应

主要从分析烷基对有机分子和离子的影响讨论烷基的电子效应，指出仅用烷基的“供电”或“吸电”来表述烷基的电子效应是不够全面的。     

对硝基苯磺酰基乙酸酯的一烷基化反应

在固液相转移催化「Ｋ２ＣＯ３／ＣＨ３ＣＮ／Ｃ６Ｈ５ＣＨ２Ｎ（Ｃ２Ｈ５３Ｃｌ」条件下,对硝基苯磺酰基乙酸酯可与溴代烷发生一基化反应。     

蓖麻油烷醇酰胺硼酸酯(RAB)的合成

本文以蓖麻油为原料，通过醇解，酰胺化得到蓖麻油烷醇酰胺（ＲＡ），ＲＡ与硼酸进行酯化反应，最终合成了一种新型的有机硼表面活性剂———蓖麻油烷醇酰胺硼酸酯（ＲＡＢ）。并确定了工艺条件：ＲＡ∶Ｈ３ＢＯ３＝２∶１，温度１３０～１４０℃。对产物ＲＡＢ用红外光谱，核磁共振作了表征。     

烷基电子效应的再认识

烷基的电子效应尽管因其所连环境的不同而有异,但是认为烷基此一时是给电子的诱导效应,彼一时又是吸电子的诱导效应,以及认为烷基的超共轭效应仅存于溶液体系中是站不住脚的。本文作者认为,烷基在不带电荷的中性有机结构中,通过诱导效应总是吸电子的,但当它与不饱和结构,包括带正电荷的原子或原子团相连时,还通过Baker—Nathan超共轭效应,乃至空间超共轭效应起供电作用。只是这种供电作用,在溶液中,由于溶剂化作用,其相对强弱遵循Baker—Nathan顺序;而在气相或溶剂化作用很小的溶液中则遵循反Baker—Nathan顺序.     

气液色谱法测定卤代烃溶质在环丁砜——NaI溶液中的无限稀释活度系数

本文利用气液色谱法测定了333. 15K 时一些卤代烃溶质(氯代正丙烷、溴代正丙烷、碘代正丙烷、氯代正丁烷、氯代异丁烷、溴代异丙烷)在环丁砜-NaI 溶液中的无限稀释活度系数γ_1~∞.实验结果表明.lnγ_1∞和 NaI 的摩尔分数间存在较好的线性关系.     

相转移催化反应的研究——Ⅱ、苯硫基乙酸芳酯的合成

本文报导通过苯硫基乙酰氯与酚类化合物在液—液相转移催化条件下的酰化反应合成了十个尚未见文献报导过的苯硫基乙酸芳酯,它们的结构通过元素分析和红外光谱确证。     

Effect of alkyl substitutions on self-assembly

The self-assemblies of 4-hexadecyloxybenzoic acid and 3,4,5-trihexadecyloxybenzoic acid have been studied by using scanning tunneling microscopy (STM). The well-ordered assemblies with different arrangement have been investigated. The structural change is attributed to the different number of substituted alkyl chains on periphery.     

N-烷基-N′-取代苯基硫脲类化合物合成的研究

本文通过取代邻氨基苯甲酸与烷基异硫氰酸酯的加成反应,合成了8个N-烷基-N’-取代苯基硫脲类化合物。这些化合物的结构分别通过元素分析、红外光谱、核磁共振及紫外光谱等方法进行了鉴定。