[PSF-PDMS-PHS]_n/PSF共混物的相容性及表面组成

Compatibility and Surface Composition of [PSF PDMS PHS] n /PSF Blends

利用ＤＳＣ、ＤＭＡ、ＴＥＭ和ＸＰＳ对［ＰＳＦ－ＰＤＭＳ－ＰＨＳ］ｎ／ＰＳＦ共混物的相容性及表面组成进行了研究．结果表明，ＰＤＭＳ在共混物表面的富集与ＰＳＦ均聚物和［ＰＳＦ－ＰＤＭＳ－ＰＨＳ］ｎ中硬段的相容性有关；ＰＤＭＳ在相容的共混物体系表面的富集与对应的多嵌段共聚物组成基本相近；不相容共混物体系表面ＰＤＭＳ的富集程度相对较高，当共混物本体中有机硅含量从１％增至５％，表面层ＰＤＭＳ的含量迅速增加，可达到嵌段共聚物中ＰＤＭＳ的含量．

The relationship between the compatibility in bulk and surface enrichment of PDMS has been studied with a series of [PSF PDMS PHS] n /PSF blends, where PSF polysulfone, PDMS polydimethylsiloxane, PHS poly p hydroxystyrene. DSC, DMA and TEM were used to characterize the bulk morphology, and XPS was used to obtain the information of the surface composition. It is shown that the level of surface enrichment of PDMS was affected by the compatibility between the homopolymer PSF and the hard phase of [PSF PDMS PHS] n . PDMS surface enrichment in the blends was similar to that in the corresponding ternary segmented copolymer [PSF PDMS PHS] n , when the homopolymer PSF and the hard phase of [PSF PDMS PHS] n were miscible. XPS results on the immiscible blends of [PSF PDMS PHS] n /PSF indicated a higher surface enrichment of PDMS, and the latter increased rapidly when the bulk siloxane concentrztion increased from 1% to 5%.