Intercalation behavior of poly(ethylene glycol) in organically modified montmorillonite
Intercalation behavior of poly(ethylene glycol) in organically modified montmorillonite
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DOI：
10.1016/j.apsusc.2013.03.123
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发表时间：
2013-07
影响因子：
6.7
通讯作者：
Shi-peng Zhu;Hongmei Peng;Jinyao Chen;Huilin Li;Ya Cao;Yunhua Yang;Zhi-hai Feng
中科院分区：
文献类型：
--
作者：
Shi-peng Zhu;Hongmei Peng;Jinyao Chen;Huilin Li;Ya Cao;Yunhua Yang;Zhi-hai Feng
本文采用不同烷基链数的烷基铵表面活性剂制备了两种有机改性蒙脱石（OMMT）。 XRD 结果表明，低浓度表面活性剂使 OMMT 的层间距增加。随着表面活性剂浓度的进一步增加，OMMT的层间距没有变化。同时，利用FTIR表征了OMMT层间表面活性剂的局部环境。结果表明，与单链表面活性剂S-18相比，双链表面活性剂D-18在OMMT层间空间中更倾向于采用高度有序的构象。这表明OMMT的表面性质受到插层表面活性剂的浓度和构型的影响。此外，通过 XRD 和 DSC 研究了 OMMT 类型，或更具体地层间距中有机改性剂的化学性质和聚乙二醇 (PEG) 浓度对 OMMT 中 PEG 链嵌入行为的影响。结果表明，当表面活性剂在 Na-MMT 层间距中饱和时，PEG 链不能嵌入到 Na-MMT 中。当S-18浓度低于2.00CEC时，PEG链可以嵌入SM的层间空间，这意味着低表面活性剂浓度改性的SM也为PEG嵌入提供了更好的环境（可能是通过平衡的疏水和亲水表面）。然而，当D-18浓度高于1.00CEC时，PEG不会嵌入DM的层间空间。这可能是由于 D-18 增加了 DM 的疏水性双烷基链。 1.50DM 杂化物层间疏水性的增加可以防止亲水性 PEG 的嵌入。
In this paper, two kinds of organically modified montmorillonite (OMMT) were prepared using alkylammonium surfactants with different alkyl chain numbers. XRD results showed the interlayer spacing of OMMT increased with low concentration surfactants. With further increasing the surfactants concentration, the interlayer spacing of OMMT was unchanged. Meanwhile, FTIR was used to characterize the local environments of surfactants in the interlayer space of OMMT. The results suggested that the double chain surfactant D-18 preferred to adopt highly ordered conformation compared with single chain surfactant S-18 in interlayer space of OMMT. It indicated that the surface property of the OMMT is affected by the concentration and configuration of the intercalated surfactants. Moreover, the effect of the OMMT type, or more particularly the chemical nature of the organic modifier in the interlayer spacing and the poly(ethylene glycol) (PEG) concentration onintercalation behavior of PEG chains in OMMT were investigated with XRD and DSC.The results indicated that PEG chains could not intercalate into Na-MMT when the surfactants were saturated in interlayer space of Na-MMT. PEG chains could intercalate into the interlayer space of SM when the S-18 concentration was lower than 2.00CEC, implying that the low surfactant concentration modified SM provided a better environment (presumably through the balanced hydrophobic and hydrophilic surfaces) for the PEG intercalation as well. However, PEG did not intercalate into the interlayer space of DM when the D-18 concentration was higher than 1.00CEC. It could be attributed to the hydrophobic double alkyl chains of DM increased with D-18. The increased hydrophobic properties in the interlayer space of 1.50DM hybrids can prevent the intercalation of hydrophilic PEG.