以羟甲基化合物合成高亚氨基甲丁混合醚化树脂的研究

探究以羟甲基化合物合成一种高亚氨基含量的甲丁混合醚化氨基树脂,该树脂先合成含一定比例亚氨基的羟甲基化合物,然后再通过甲醇、丁醇醚化改性,产品兼顾了甲醚化树脂固含量高,混溶性好,固化成膜性能佳,树脂固化成膜损耗少等优点,同时弥补了其因为张力大而导致的其对底材的润湿性差,成膜涂层的附着力差,固化成膜过程中容易出现缩孔现象,固化成膜温度高的缺点,低羟甲基含量使其不会应为羟甲基自缩聚成膜过脆,并且亚氨基含量高,固化成膜硬度较高的一种性能优异,适用性范围广的氨基树脂。

威尔金森催化剂快速合成咖啡呋喃及其反应机理

咖啡呋喃的人工合成路线复杂、收率低。以3-噻吩甲醇为原料,得到关键中间体2-乙酰基-3-噻吩甲醇,并以此为底物,可快速合成咖啡呋喃。考察合成关键底物的原料与醋酸酐物质的量比对收率的影响,并推导验证反应机理。结果表明,关键步骤噻吩环的2位乙酰化反应中,最佳原料比为n(原料)∶n(醋酸酐)=1.2;威尔金森催化剂在加氢条件下能催化2-乙酰基-3-噻吩甲醇分子内环合反应,简便快速地合成咖啡呋喃;威尔金森催化剂催化邻羟甲基羰基化合物分子内环合反应可能经历分子内半缩酮脱水和催化加氢还原。

用DEPT135测定Resol的组成及微细结构参数

通过对resol(羟甲基酚化合物和低分子量羟甲基酚树脂)DEPT135图谱的分析讨论,得到一系列计算resol微细结构参数的经验公式。根据DEPT135图谱可判断是否发生缩聚反应,根据经验公式可计算酚单体各个活性点参与反应百分率或酚羟基导入率、不同类型缩聚所占百分率及低分子量羟甲基酚树脂的平均核体数。

超低甲醛轻薄织物的抗皱免烫整理

轻薄织物经过羟甲基酰胺类化合物的改性体树脂LF-3 进行抗皱免烫整理,采用浸轧焙烘工艺,通过测试整理织物的抗皱效果和布面游离甲醛含量等,确定最佳整理配方和工艺条件。

Pomegranate （Punica granatum L.） Peel Extract as a Source of Natural Antioxidant

An increase in the demand for natural additives has shifted the attention from synthetic to natural antioxidants. Antioxidative components from pomegranate peel were extracted by using different solvents like methanol, ethanol, acetone, chloroform and ethyl acetate. All the extracts were tested for Total phenolic content （TPC） and the methanol which proved to be best in extracting the phenolic compounds was used to assess the antioxidant property by using different methods like Diphenyl piridyl picryl hydrazyl （DPPH）, Relative reducing power （RRP）, Beta carotene bleaching and Ferric thiocyanate （FTC）. The antioxidant activity （AA） of pomegranate peel extract （PPE） was compared with Butylated hydroxyl toluene （BHT） and Butylated hydroxyl anisole （BHA）. The methanolic extract was examined by Liquid Chromatography and Mass Spectroscopy （LCMS） and the spectra showed the presence of different phenolic compounds. The extracts were tested for their efficiency in preventing rancidity of Refined Bleached Deodorized Soybean oil （RBDSBO） in comparison with BHT and control at 200 ppm concentration. The PPE proved to be best in preventing rancidity. Owing to the present results, the studies can further be extended to exploit the PPE for application into different food products.

Catalytic transformations of cellulose and its derived carbohydrates into 5-hydroxymethylfurfural, levulinic acid, and lactic acid

The catalytic transformation of cellulose into key building-block or platform chemicals such as 5-hydoxymethylfurfural(HMF),levulinic acid,and lactic acid under mild conditions,has attracted much attention in recent years,as these conversions can be operated without consumption of hydrogen or oxygen and thus are more economical compared to the hydrogenolysis or oxidation of cellulose.This review article highlights recent advances in the development of novel catalysts or catalytic processes for the conversion of cellulose and its derived carbohydrates into HMF,levulinic acid,and lactic acid or their esters under inert atmosphere.We also analyze efficient catalytic systems for HMF production,in particular Lewis acids combined with ionic liquid or biphasic systems.For the formations of levulinic and lactic acids or their esters,we focus on the reactions in aqueous and alcohol media catalyzed by multifunctional catalysts that combine the functions of hydrolysis,isomerization,and dehydration-rehydration or retro-aldol reactions.The reaction mechanism for each process will also be discussed to gain insights into the activation of C–O and C–C bonds in the absence of hydrogen or oxygen.

Natural plant-derived 3,4-dihydroxybenzaldehyde ameliorates reproductive damage of male mice

In the present study,we studied the effects of 3,4-dihydroxybenzaldehyde,derived from Salvia miltiorrhiza Bunge,on mouse sperm survival and sperm membrane integrity in vitro and on mouse reproductive damage induced by cyclophosphamide in vivo.3,4-Dihydroxybenzaldehyde(0.01,0.1,and 1 mg/m L)improved sperm survival rate and sperm membrane integrity in separated mouse sperm(all P<0.05).In cyclophosphamide-treated male mice(60 mg/kg/d through intraperitoneal injection for 5 d),3,4-dihydroxybenzaldehyde(40 mg/kg/d through intragastric gavage for 35 d)increased the testis index,epididymis index,and sperm nuclear maturity(all P<0.05).3,4-Dihydroxybenzaldehyde also improved testis morphology characterized by orderly arranged layers of spermatogenic cells,numbers of sperm in the lumen,normal mesenchymal cells,and close and tidy arrangement of the seminiferous tubules.3,4-Dihydroxybenzaldehyde also increased testicular superoxide dismutase activity and elevated DJ-1 expression.In addition,it decreased the expression of ICAM-1 and enhanced the expressions of VCAM-1,PEDF,VEGF,and PPARγ.These findings indicated that 3,4-dihydroxybenzaldehyde increased mouse sperm survival and sperm membrane integrity in vitro and reduced mouse reproductive damage induced by cyclophosphamide via DJ-1 and other targets in vivo.3,4-Dihydroxybenzaldehyde might thus be useful for treating male reproductive damage and antineoplastic cyclophosphamide-induced reproductive toxicity.