準(zhǔn)單分散的“平頭”聚苯乙烯-聚丙烯酸（PS-b-PAA）膠束

提出使用一種準(zhǔn)單分散的“平頭”聚苯乙烯-聚丙烯酸（PS-b-PAA）膠束，用于模擬研究腐殖酸（HA）膠體與鈾酰的相互作用。鑒于X射線對重金屬的敏感性，主要使用同步輻射X射線小角散射（SAXS）技術(shù)表征了鈾酰對PS-b-PAA膠束結(jié)構(gòu)的影響，樣品的散射曲線具有明顯的球殼結(jié)構(gòu)振蕩峰，吸附鈾酰后，振蕩峰強度增加，同時發(fā)現(xiàn)低q區(qū)域的散射強度增加。球殼模型擬合分析表明：弱酸性水溶液中，鈾酰使得PAA殼層厚度降低、襯度增加；平均1個PS(279)-b-PAA(69)膠束可吸附600個鈾酰離子[UO22+, UO2OH+,(UO2)2(OH)22+]；隨著鈾酰濃度的增加，膠束發(fā)生團聚，進而產(chǎn)生沉淀。

圖文導(dǎo)讀

Figure 1. SAXS curves obtained from PS-b-PAA micelles in H2O andDMF/H2O solutions; the curves are shifted vertically by factors of 2 and 4 for clarity; black lines are the best fits to core-shell model (a). Modelfitting to the SAXS data of PS-b-PAAmicelles in H2O; the solid, dash, and dash dot lines denote the fitsto core-shell, solid sphere, and spherical shell models, respectively (b).

Figure 2. SAXS curves obtained from the PS-b-PAA micelles and uranyl nitrate mixtures; the curves are shiftedvertically by factors of 2, 4, and 8 for clarity; black lines black lines arethe best fits to core-shell model (a). A zoom-in of (a) in the medium q range (b). Deviation between the experimental andfitted data at the low q region (c). Notethat PS-b-PAA-7UO2 and PS-b-PAA-10UO2 sample are notevaluated because they show precipitations.

Figure3. PAA corona thickness ΔR and contrast Δρshell as a function of uranyl concentration.

Figure 4. TEM micrographs of the PS-b-PAA-1UO2 (a) and PS-b-PAA-5UO2 (b).

產(chǎn)品供應(yīng)：

PNIPAM-b-P4VP 聚異丙基丙烯酰胺-b-聚4-乙烯基吡啶

PCL-b-P4VP 聚己內(nèi)酯-聚乙烯基吡啶

PtBMA-b-P4VP甲基丙烯酸叔丁酯 -乙烯吡啶

P4VP-b-PS-b-P4VP聚苯乙烯一b一雙聚(4-乙烯基吡啶)三嵌段共聚物

PtBS-b-P4VP

Fe3O4-SiO2-P4VP

PAA-b-PS-b-P4VP

PAA-b-P4VP

PtBOS-b-PS-b-P4VP

PS-b-P2VP

P2VP-b-PAA

P2VP-b-PtBA

P2VP-b-PNIPAAm

P2VP-b-PS-b-P2VP

P2VP-PEO

PTEPM-b-P2VP聚(γ-甲基丙烯酰氧基丙基三乙氧基硅烷)-b- 聚(2-乙烯基吡啶)

PDMA-P2VP

PCL-b-P2VP

PFS-b-P2VP

P2VP-b-PMMA

P2VP-b-PtBA

PHIC-b-P2VP

P2VP-Br，P4VP-Br

PtBA-b-P2VP-b-PtBA

PS-b-P2VP-b-PEO聚苯乙烯-b-聚乙烯基吡啶-b-聚氧化乙烯

PS-b-PAA聚苯乙烯-b-聚丙烯酸

PS-b-PNIPAAm聚苯乙烯-b-聚(N-異丙基丙烯酰胺)

PS-b-PMMA聚苯乙烯-b-聚甲基丙烯酸甲酯

PS-BSA聚苯乙烯-牛血清白蛋白

PS-PIB-PS聚苯乙烯-聚異丁烯-聚苯乙烯

PS-PEG-PS

PS-b-PVP聚苯乙烯-b-聚乙烯吡喏烷酮

PS-b-PNIPAM-b-PS  聚苯乙烯-b-聚(N-異丙基丙烯酰胺) -聚苯乙烯

PS-b-PDMA

PS-b-PEO-b-PtBA聚苯乙烯-聚氧乙烯-聚丙烯酸叔丁酯

PS-b-PDMS

PS-b-PtBA

PS-b-PnBA-OH羥基-丙烯酸正丁酯和苯乙烯的兩嵌段聚合物

PAA-b-PSt

PAA-b-PNIPAM聚丙烯酸-b聚(N-異丙基丙烯酰胺)

PSt-b-PAA-b-PSt

PS-b-PAA-b-PEG

PAA-Cisplatin

PLLA-PAA-RGD

PMMA-b-PNIPAAm-b-PMMA

PMMA-b-PDMAEMA聚甲基丙烯酸甲酯-b-聚甲基丙烯酸-N,N-二甲氨基乙酯

PMMA-b-PSt

PMMA-b-PBMA

PMMA-b-PnBA-b-PMMA

PMMA-b-PS

PSt-b-PBA-b-PSt

PMMA-b-PBA-b-PMMA 聚甲基丙烯酸甲酯-b聚(丙烯酸丁酯-b-甲基丙烯酸甲酯)

PS-b-PMMA-b-PBMA

PMMA-b-PBA 苯硼酸-b-聚甲基丙烯酸甲酯

PMMA-b-PBPEA-g-PS

PtBA-b-PMMA

PVP-b-PMMA

PLA-b-PMMA聚乳酸-b-聚甲基丙烯酸甲酯

PtBuA-b-PNIPAM聚丙烯酸三丁-b-聚(N-異丙基丙烯酰胺)

PtBuA-b-PMA

PS-b-PtBuA

PS-b-PtBuA-b-PS

PCL-b-PtBuA

PSt-b-PtBuA

PDMS-b-PSt

PEO-b-PDMS聚氧乙烯-b-聚二甲基硅氧烷

POSS-PDMS

chitosan-g-PDMS

PMAA-PEG-PMAA

PVP-b-PMAA

mPEG-b-PMAA

P4VP-b-PMAA  聚(4-乙烯基吡啶)-b-聚甲基丙烯酸甲酯（PMMA）

PMAA-b-PDMAEMA

上述產(chǎn)品僅用于科研，不可用于人體實驗！

wyf 05.12