PREPARATION OF THE PbS NANOMETER PARTICLES USING THE POLYMALEIC ACID－OCTADECANOL MONOESTER AS WRAPPAGE

A stable and homogeneous PbS nanometer particle Wrapped in the Polymaleie Acid-Octadecanol monoester is obtained based on the reaction Ph2+ + H2S, the H2S is obtained from the hydrolysis of thioacetamide osmosing into the colloidal nucleus from the dispersing medium. The size of the PbS nanometer Particle is between 4 and 6 nm determined by TEM.

Synthesis and Investigation of Monoesters of Polymaleic Acids with Azo-Group

A series of amphiphilic polymers, monoesters of polymaleic acid containing azo side groups (PMAN A n Me) was synthesized by the reaction of alcohol(A n Me) with polymaleic anhydride (PMAN) for Langmuir Blodgett assembly. The effects of the length of flexible spacer in the side chain on the π A isotherms and LB films were investigated. The UV Vis and infrared linear dichroism spectra showed that the azo side groups were highly oriented in PMAN A 6Me LB film deposited on silica or CaF 2 substrate.

HPMA modified aluminium nitride powder for aqueous tape casting of AlN ceramic substrates

Aluminum nitride(AlN)is considered one of the most desirable materials for integrated circuits and electronic packaging substrates.However,raw AlN powder reacts easily with water,forming Al(OH)3 or AlOOH on the surface and hindering the development of an aqueous tape-casting process for preparing AlN ceramic substrates.In this study,hydrolyzed polymaleic anhydride(HPMA)was used to modify AlN powder,which has good water solubility and dispersibility.The AlN powder was modified with 5 wt%HPMA remained stable in water for at least 90 h under magnetic stirring condition and 24 h under ball milling condition,indicating that HPMA-modified AlN powder has good resistance to hydrolysis.The action mechanism of HPMA is revealed.Firstly,–COOH of the HPMA polymer and the oxide layer on the surface of the AlN powder underwent a dehydration condensation reaction to form a compound.Secondly,long chains of the polymer further coated the surface of the AlN powder,forming an anti-hydration layer with a thickness of about 7.0 nm on the surface of the AlN particles.In addition,AlN green sheets were successfully prepared by aqueous tape casting using the HPMA-modified AlN powder without additional dispersants.Subsequently,AlN ceramic substrates were obtained by sintering at 1750℃for 4 h under an N2 atmosphere with a pressure of 0.2 MPa.The relative density and thermal conductivity were tested to be 97.3%and 122 W/(m·K),respectively.

Synthesis and dyeing performance of a novel polycarboxylic acid azo dye

A novel reactive polycarboxylic acid dye was synthesized by the reaction of polymaleic anhydride（PMA） with 3-methyl-1-（4- sulfonylphenyl）-4-（4-aminophenylazo）-2-pyrazoline-5-one.The structure of the novel dye was characterized by FTIR,UV-vis and ^（13）C NMR spectra.The dyeing properties of dye on cotton were tested,and the novel dye possessed high fixation and good fastness.