Research of Poly(oxyalkylene)-bis-amidoacids Intercalated Layered Double Hydroxides
Date Issued
2008
Date
2008
Author(s)
Liao, Yi-Lin
Abstract
This thesis concerns the organic modification for the Mg–Al layered double hydroxides (LDHs), more specifically, the intercalation profile of the clay with a series of poly(oxypropylene)-bis-amidoacids (POAs). number of important issues are included in the thesis. 1)The intercalation of LDH by the POP-amidoacids and the spatial enlargement of the gallery up to 94 Å d spacing.2)The critical intercalation of using the POP2000-2MA-2Na for expanding the LDH gallery. It provides a new way for manipulating nanomaterials and control of polymer conformations in the LDH confinement.3)The amphiphilic property of POP2000-2MA-Na/LDH hybrid and their ability of lowering the toluene/water interfacial intension to 4.5 mN/m at the critical micelle concentration (CMC) of 0.01 wt%.4)Newly discovered mechanisms that involving hydrogen-bonding and chelation. The different clays such as LDH, MMT and Mica are compared for the generality of the new mechanisms.5)A pH dependence of the organo-LDH hybrids that particularly occurrence of layered structure collapse at low pH environment. The implication is an application of organic encapsulation and control release that could be developed for such a clay hybrid. In addition, the hybrids also possess thermal-sensitivity, that allows a fine dispersion at low temperature (5~10 oC) and aggregation at higher temperature (>20 oC).
Subjects
Layered Double Hydroxides (LDH)
poly(oxypropylene)-bis-amidoacids
intercalation
hydrogen-bonding
pH- and thermal-sensitivity
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-97-R95549001-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):29aa79e235e501874ae0725c4412975f