Synthesis and Characterization of Glassy Main Chain, Thermotropic Liquid Crystalline Polyesters Based Upon a Highly Substituted Phenylene-terephthalate Mesogenic Unit with Flexible Spacers PDF Download
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Author: Ann Marie Delvin
Publisher:
ISBN:
Category : Liquid crystals
Languages : en
Pages : 236
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Author: Ann Marie Delvin
Publisher:
ISBN:
Category : Liquid crystals
Languages : en
Pages : 236
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Author: C. K. Ober
Publisher:
ISBN:
Category : Liquid crystals
Languages : en
Pages : 474
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Author: Wade H. Shafer
Publisher: Springer
ISBN: 9780306437328
Category : Science
Languages : en
Pages : 448
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Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Oata Analysis and Synthesis (CINOAS) * at Purdue. University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 33 (thesis year 1988) a total of 13,273 theses titles from 23 Canadian and 1 85 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 33 reports theses submitted in 1988, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Author: Darius K. Deak
Publisher:
ISBN:
Category : Polyesters
Languages : en
Pages : 388
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Author:
Publisher:
ISBN:
Category : Ceramic materials
Languages : en
Pages : 850
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Author: Sridevi Narayan-Sarathy
Publisher:
ISBN:
Category : Polyesters
Languages : en
Pages : 330
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Author: Weihong Xu
Publisher:
ISBN:
Category : Polymer liquid crystals
Languages : en
Pages : 112
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Author: Qianqiu Ye
Publisher:
ISBN:
Category : Polyesters
Languages : en
Pages : 318
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Author: Wenyi Huang
Publisher:
ISBN:
Category : Nanotechnology
Languages : en
Pages : 236
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Three segmented main-chain thermotropic liquid crystalline polymers (TLCPs) functionalized with nitrogen-containing heterocyclic groups were synthesized; namely PyHQ12 having pendent pyridyl group, PABP having side-chain azopyridyl group with flexible spacer, and PTBP containing side-chain terpyridine group with flexible spacer. The principles of specific interactions were applied to prepare supramolecular structures and organoclay or clay nanocomposites based on these functional TLCPs. Three combined main-chain/side-chain liquid-crystalline polymers (MCSCLCPs) were prepared via hydrogen bonding or ionic interactions based on PyHQ12 and PABP. The presence of hydrogen bonds in self-assembled PyHQ12-7CNCOOH and PABP-AA, and the presence of ionic interactions in self-assembled PABP-TSA, which exist above their respective clearing temperatures, were confirmed using Fourier transform infrared (FTIR) spectroscopy, the thermal transitions in each MCSCLCP were determined using differential scanning calorimetry (DSC), and the mesophase structures of each self-assembled MCSCLCP were characterized using polarized optical microscopy (POM) and wide-angle X-ray diffraction (WAXD). PyHQ12 was observed to be very effective in exfoliating organoclay (Cloisite 30B) aggregates, because of the formation of hydrogen bonds, as determined by in situ FTIR spectroscopy, between the pendent pyridyl group in PyHQ12 and the hydroxyl groups in the surfactant MT2EtOH residing at the surface of Cloisite 30B. Thus, functionality in TLCP is necessary to obtain highly dispersed organoclay nanocomposites, but at the same time there is a possibility to lose some degree of liquid crystallinity in the TLCP, due to the proximity of the pendent pyridyl group to the mesogenic main-chain backbone. Thus, another functional TLCP, PABP having side-chain azopyridyl group with flexible spacer, was synthesized. It has been found that the liquid crystallinity of PABP in the organoclay nanocomposites was more or less intact and yet organoclay (Cloisite 30B) aggregates were very well dispersed, which was attributed to the fact that the pyridyl group in the side-chain azopyridine of PABP is located sufficiently far away from the mesogenic main chain. The rheological properties of functional TLCP/organoclay nanocomposites were also investigated. A unique polymer/ruthenium complex [RuII(PTBP)(6TPy)](PF6)2 based on PTBP was used to prepare natural clay (Montmorillonite, MMT) nanocomposite. X-ray diffraction and transmission electron microscopy indicate that MMT has a high degree of exfoliation in the matrix of PTBP/ruthenium complex. UV-vis spectroscopy and FTIR spectroscopy show that the driving force for exfoliating MMT in PTBP/ruthenium complex is attributable to the Coulombic interactions between the positively charged ruthenium center in the side chain of the polymer and the negatively charged clay surfaces.
Author: Chain-Shu Hsu
Publisher:
ISBN:
Category :
Languages : en
Pages : 446
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