二丁基次膦酸锌高聚物溶液的平衡粘度

通过对二丁基次膦酸锌聚合物溶液平衡粘度与体系中水含量间关系的研究,证明:高分子溶液的相对粘度随体系中水含量的增加而减少。反之亦然。在室温下可很快地建立起平衡。高分子溶液的平衡粘度值取决于体系的水蒸汽分压。     

甲基苯基次膦酸与锌盐的水溶液配位聚合及聚合物水溶液的电导行为

<正> 次膦酸金属配位聚合物具有良好的耐高温性能。但象许多其它无机聚合物一样,某些次膦酸金属配位聚合物不耐水解,如有些聚合物与水长期接触后,即转化为粉末,不复溶于原有机溶剂中。Block等曾简短报导过二甲基次膦酸锌的水溶液测不出特性粘数,所以,为制备这类聚合物,文献上都采用无水有机溶剂作为反应介质的合成方法,     

STUDY ON SOME PROPERTIEE OF Si-CONTAINING POLYESTER-POLYETHER MULTIBLOCK COPOLYMERS

Some physical properties of the polyester-polyeher multiblock copolymers with Si-containing hard segment were further examined by a series of physical methods. Thehydrophobicity of the copolymers was improved with the incorporation of increasing amountof organosilicone, XPS test proved that silicon element was enriched at the surface of theSi-containing polyeser-polyether copolymers. It was also found that their heat resistanceand gas permeability for O_2 and N_2 were greatly improved. The study on semipermeabilityof films made of the Si-containing copolymers was also followed with interest.     

STUDIES ON EPOXY RESINS MODIFIED WITH POLY (BUTYLENE TEREPHTHALATE)-b-POLY (TETRAMETHYLENE GLYCOL)

Poly(butylene terephthalate )-b-poly (tetramethylene glycol) (PBT-b-PTMG) was usedas rheology modifier for the epoxy resin. The segmental copolymer formed spherulites inthe epoxy medium. This copolymer was very effective in endowing yield stresses to theliquid resin. The PTMG segment brought in a lowering of the dissolution temperature ofthe spherulites in the epoxy gel. The cured resin with PBT-b-PTMG as modifier was two-phase materials. The rheology modifier improved the mechanical properties of the curedresin as well. The flexible PTMG segments, however, were not in favour of the tougheningeffect of the modifier. This was attributed to the large domain size of the dispersed phase.     

SYNTHESES AND CHARACTERIZATI0N OF Si-CONTAINING POLYESTER-POLYETHER MULTIBLOCK COPOLYMERS

A series of Si-containing polyester-polyether multiblock copolymers were synthesizedby transesterification and melt copolycondensation of organosilicon monomers [1, 1, 3, 3-tetramethyl-1, 3-bis (p-carbomethoxyphenyl) disiloxane] (I ) or dimethyl bis (p-carbometh-oxyphenyl) silane] (II) and dimethyl terephthalate (DMT), with 1, 4-butanediol, poly-tetramethylene glycol (PTMG) respectively. The organosilicon monomers were preparedby Grinard reaction, oxidation and esterification. The structures of the above monomers(I), (II) and the copolymers were characterized by MS anal. and ~1H-NMR.