通过双分子合成法合成了(CTA)1/3 [Cu 46(C 9 H 3 O 6)24(OH)12 ](PW 12 O 40)3 ·xH 2 O(COK-15b)的新材料MOF。模板方法,在无溶剂条件下,以化学计量比将季戊四醇与脂肪酸酯化为相应的季戊四醇四酯时,具有很高的活性和选择性,并具有高达98%的收率。通过TEM,SEM,TG,BET,TPD和Py-IR对COK-15b进行了表征。此外,研究了COK-15b的稳定性,可以将其重复使用5个运行周期而不会出现明显的失活。
POLYOL DERIVED ANTI-MICROBIAL AGENTS AND COMPOSITIONS
申请人:Elder Stewart Todd
公开号:US20090286878A1
公开(公告)日:2009-11-19
Anti-microbial compositions are provided which comprise as an antimicrobial agent at least one compound derived from a select polyol containing at least 3 hydroxy groups wherein one or more, and often two or more, of the hydroxyls are derivitized to form certain ether, ester, carbonate or carbamate groups which groups may bear additional functionality. Novel antimicrobial compounds of this class are also provided. The compositions are effective against a variety of pathogens including fungi, Gram positive bacteria and Gram negative bacteria and are expected to have low human toxicity. Applications for the polyglycerol anti-microbial agents and compositions include those involving human and plant contact, such as cosmetics, hair care products, textiles and plant protections, as well as in applications with much less human contact, such as plastics, coatings, wood, paper and other materials of construction.
Microwave-promoted synthesis of polyolesters for lubrication oil using a composite catalyst in a solvent-free procedure
作者:Fengxiu Zhang、Guangxian Zhang
DOI:10.1039/c0gc00351d
日期:——
rapid, highly efficient and green synthetic approach to polyol esters for lubrication oils is proposed. Using sulfuric acid and p-toluene sulfonic acid as a composite catalyst and C5–C9 straight-chain monocarboxylic acids, with pentaerythritol (PE) and dipentaerythritol (di-PE) as starting materials, a series of lubricationoil polyol esters were synthesized in the absence of solvent under microwave
Solubility of HFC32, HFC125, HFC134a, HFC143a, and HFC152a in a Pentaerythritol Tetrapentanoate Ester
作者:Åsa Wahlström、Lennart Vamling
DOI:10.1021/je980235e
日期:1999.7.8
Solubilities of five different hydrofluorocarbons (HFCs) in a pentaerythritol tetrapentanoate ester (95% purity) have been measured at temperatures between 303.15 and 363.15 K and pressures between 0.05 and 1.9 MPa. Henry's constant and the activity coefficient for HFCs at infinite dilution were derived for measurements below 0.26 MPa. The measurements were made with an isochoric method with an uncertainty
申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0514988A2
公开(公告)日:1992-11-25
This invention provides fluid compositions for use in compression refrigeration comprising mixtures of
(a) at least one fluorohydrocarbon and
(b) at least one carboxylic ester of a polyhydroxy compound, having the general formula
C(CH₂.O.CO.R)n(R')4-n (I)
wherein n is 3 or 4, R' represents a methyl or ethyl group and each R independently represents a C₃₋₈ alkyl group containing 3 to 5 chain atoms.
The invention relates to a spindle motor for use in a magnetic recording data storage device which can operate effectively at high rotational speeds. The spindle motor has ball bearings coated with an improved lubricant. The improved lubricant comprises an alkali hydroxystearate, an ester oil, a dialkyldiphenylamine and a dialkyldithiocarbamate. The lubricant improves rotational operation of the motor.