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Dissertations / Theses on the topic 'Rod-like Polymers'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Pugh, Coleen Renee. "Model compounds for liquid crystal polymers containing rod-like and disk-like mesogens." Case Western Reserve University School of Graduate Studies / OhioLINK, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=case1059486231.

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2

Yang, Xing. "Synthesis and Self-assembly of Giant Shape Amphiphiles Based on Rod-like Polymers and Precisely Functionalized Fullerenes." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491576298738033.

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3

Cobb, Philip D. "Dynamic simulations of suspensions of rod-like polymers and colloids." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0013662.

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4

Petrov, Eugene P., Anastasiia Artemieva, Christoph Herold, and Petra Schwille. "Interaction of semiflexible polymers and rod-like colloidal particles with strongly charged lipid membranes." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-182828.

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5

Petrov, Eugene P., Anastasiia Artemieva, Christoph Herold, and Petra Schwille. "Interaction of semiflexible polymers and rod-like colloidal particles with strongly charged lipid membranes." Diffusion fundamentals 20 (2013) 39, S. 1, 2013. https://ul.qucosa.de/id/qucosa%3A13606.

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6

Zhang, Ruimeng. "Design, Synthesis, and Self-assembly of Dendritic Rod-like Molecules with Precisely Controlled Compositions, Interactions, and Topologies." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron157231026041301.

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7

Embs, Frank, Dirk Funhoff, André Laschewsky, et al. "Preformed polymers for Langmuir-Blodgett films- molecular concepts." Universität Potsdam, 1991. http://opus.kobv.de/ubp/volltexte/2008/1719/.

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The use of preformed polymers for the preparation of Langmuir-Blodgett (LB) multilayers is reviewed. Principles for polymer self-organization are outlined and the appropriate molecular designs are discussed. Recent developments in the different classes of polymers for LB multilayers are presented, and their outstanding properties highlighted.

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8

Petrov, Eugene P., Christoph Herold, and Petra Schwille. "Translational and rotational diffusion of semiflexible DNA polymers and rod-like fd virus particles on weakly charged freestanding cationic lipid membranes." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-183373.

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9

Petrov, Eugene P., Christoph Herold, and Petra Schwille. "Translational and rotational diffusion of semiflexible DNA polymers and rod-like fd virus particles on weakly charged freestanding cationic lipid membranes." Diffusion fundamentals 20 (2013) 67, S. 1, 2013. https://ul.qucosa.de/id/qucosa%3A12594.

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10

Chang, Chin-Feng, and 張金鳳. "Light Emitting Diodes of Heterocyclic Aromatic Rigid-Rod and Coil-Like Polymers." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/25069707447435452915.

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碩士<br>國立中山大學<br>材料科學研究所<br>89<br>ABSTRACT Optoelectronics of polymer light emitting diode (LED) depends significantly on polymer molecular structure and charge conjugation. This study focused on the optoelectronics of freestanding films and LEDs of a colinear, fully conjugated heterocyclic aromatic rigid-rod polymer (PBT) and its mixtures with a partially conjugated coil-like polymer (Pbi). A deuterated PBTd4 was also mixed with a fully conjugated coil-like polymer (ABPBI) for UV-Vis absorption spectrum, photoluminescence (PL), diodic current-voltage response, and electroluminescence (EL). Rigid-rod PBT was only soluble in strong protic acid. PBT films were processed using methanesulfonic acid. PBT free-standing films showed maximum absorptions at 468 nm and 640 nm; PBTd4 having all hydrogen atoms on the phenylene moiety substituted by deuterium retaining same electron orbitals thus showed same absorption and PL spectra. It was likewise for the PBTd4 and ABPBI mixtures at ABPBI concentrations of 1 % and 10 %. For mixtures of PBT and Pbi, the absorption spectra indicated super- position of individual optical absorption response and no energy transfer. However, PL spectra showed a blue shift with increasing Pbi content. This was attribed for PBT rod-like configuration, or PBT aggregation perturbed by mixing with Pbi. Monolayer LED of Al/PBT/ITO and Al/Pbi/ITO yielded a threshold voltage of 4 V. When PBT/Pbi mixtures of 75/25, 50/50, 25/75, were used as the light emitting layer, the threshold voltage altered to 10 V, 7 V and 17 V, respectively. This threshold voltage deviation from 4 V is due mainly to difference in layer thickness, or phase separation affecting the tunneling effect. To enhance LED stability, an Ag layer was evaporated onto the Al electron injection electrode. For Ag/Al/PBT/ITO devices and mixed PBT/Pbi (75/25,50/50,25/75) devices, the maximum EL wavelength exhibited no systematic change at 753 nm, 714 nm, 727 nm, and 697 nm, respectively, due to using different bias voltage.

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11

Chen, Chih-Chun, and 陳致君. "Fragment Parameters for the Calibration of Molecular Weights of Rod-Like Oligomers/Polymers by Gel PermeationChromatography." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/78858096364781944145.

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碩士<br>國立臺灣大學<br>化學研究所<br>104<br>Gel permeation chromatography (GPC) offers a powerful tool to determine number average molecular weight (Mn) and weight average molecular weight (Mw), of a polymer, from which polydispersity (PDI) of the polymer is obtained. Polystyrenes are commonly used as the reference in GPC analyses. What GPC measures is the hydrodynamic volume of a polymeric sample which is closely related to the shape of the polymeric molecules. Thus, when the molecular shape or hydrodynamic radius of a polymer is different from that of polystyrene references, the deviation of molecular weights of polymers from the exact values is frequently observed. This is particularly true for rod-like polymers such as oligo/polythiophenes that exhibit larger intrinsic viscosity than that for highly folded polymers. A set of new empirical parameters ci of commonly used fragments including a range of different substituted thiophenes, benzenes, pyridines, ethylenes, ethynylenes as well as butadienes for the calibration of the inflated Mn data obtained by GPC measurements for rod-like oligomers/polymers has been established. The parameters, ci, are ranging from 0.16 to 1.18, and they are obtained by adjusting the slopes of the plots of Mn versus the real molecular weights, Mr, for a series of oligomers and polymers to approximately 1. The calibrated molecular weights, Mc, are calculated based on equation, Mc = [ciFi]Mn, where Fi indicates the fragment fraction for the corresponding fragment ci in an oligomer/polymers, and match nicely with Mr of oligomers/polymers. More than 84% of calculated Mc values are within 12% deviating from the real molecular weights, Mr.

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12

Yu, Michael Seungju. "Smectic ordering of rod-like polymers owing to monodispersity of chain length: Synthesis and characterization of benzyl and (4-hexadecyloxy)benzyl esters of monodisperse derivatives of poly(alpha,L-glutamate)." 1998. https://scholarworks.umass.edu/dissertations/AAI9909234.

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Two types of monodisperse rod-like polymers, poly($\gamma$-benzyl $\alpha$,L-glutamate) (PBLG) and poly($\gamma$-4-(hexadecyloxy)benzyl $\alpha$,L-glutamate) with backbone sequences of have been prepared by chemical modification of monodisperse poly($\alpha$,L-glutamic acid) (PLGA) that was synthesized by recombinant DNA biosynthesis techniques. The monodisperse PLGA () was produced in Escherichia coli as a fusion to mouse dihydrofolate reductase and purified to homogeneity by metal affinity chromatography, CNBr digestion and ion-exchange chromatography.$$\rm GluAsp(Glu\sb{17}Asp)\sb{x}GluGlu\quad x = 3, 4, 5, 6\eqno {\bf1}$$ The monodisperse PBLG derived from showed smectic ordering both in solution and in films as characterized by polarized light optical microscopy and X-ray diffraction. The layer spacings of smectic order were nearly identical to the expected length of the rods, given the axial rise per residue of 1.5 A for the $\alpha$-helix. X-ray diffraction patterns of magnetically oriented films were consistent with the supramolecular structure in which helical rods are arranged in layers with their helical axes approximately perpendicular to the smectic layers. Transmission electron microscopy and electron diffraction on the PBLG films revealed a banded morphology with an approximately 120 nm period which provides strong evidence for helical rotation of the director field as in cholesteric order. Detailed examination of the relative orientation of the banding in the morphology image and the reflections in the electron diffraction pattern leads to the conclusion that the structure of the unoriented smectic PBLG is that of a smectic A*. The monodisperse poly($\gamma$-4-(hexadecyloxy)benzyl $\alpha$,L-glutamate)s exhibit strong melting transitions at around $40\sp\circ$C; however no ordered melt was observed due in part to the reduced aspect ratio brought about by the long alkyl side groups.

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13

Huang, Yin-Hao, and 黃胤豪. "Morphological Behaviors of Rod-like Polymers with Different Architectures of Side-chain: a GPU-accelerated Coarse-grained Molecular Dynamics Study." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/07022722783803605959.

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碩士<br>國立臺灣大學<br>高分子科學與工程學研究所<br>100<br>The GPU-accelerated coarse-grained molecular dynamics is adopted to investigate the effects of various side-chain architectures referring to compositions of main-chain, grafting densities of side-chains with different sizes of side-chain beads and rigidity of main-chains on the morphological behaviors of rod-like polymers. We set our parameters according to the well packing of poly(3-hexylthiophene)s in melting state. The self-assembly behaviors were observed in single-layered lamellae, Smectic C, and Nematic phase with different architectures of side-chains in 100% grafting density. The order parameters were decreased rapidly below the composition of main-chain by 0.2 with all architectures of side-chains due to the interfacial energy between different kinds of coarse-grained beads, main-chain and side-chain beads. When the fraction of main-chain was fixed in 0.5, the hexagonal cylinder and double-layered lamellae were found in 50% and 25% grafting density of linear side-chains. The aggregation phenomena of main-chains by 50% grafting density side-chains is more closely packed than 25% grafting density on different side-chain architectures. Besides, multi-stranded helixs were observed by increasing the bead size with different architectures of side-chains in 50% grafting density system. In the end, the spring constant of dihedral angles of main-chains were deduced to study the effects by breaking the coplanarity of main-chains on the morphological behaviors of rod-like polymers, and a destruction of ordered state has be found in this part.

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14

Wang, Lian-bing, and 王廉秉. "Organic Photovoltaic Cells of Fully Conjugated Coil-like Poly-(3-hexylthiophene) and Rod-like Heterocyclic Aromatic Polymer Doped with Nano-carbon Particles." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/t95cbt.

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碩士<br>國立中山大學<br>材料與光電科學學系研究所<br>97<br>Fully conjugated heterocyclic aromatic rod-like polymer poly-p-phenylene- benzobisoxazole (PBO) and coil-like poly-(3-hexylthiophene) (P3HT) were applied as opto-electronically active layer. The two polymers mixed with nano-carbon particles, having excellent optical absorption and electric conductivity, of [6,6]-phenyl C61-butyric acid methyl ester (PCBM) or esterified multi-wall carbon nano-tube (MWNT-COOC10H21) as well as a hole transporting layer of PEDOT:PSS. Photovoltaic (PV) cells of indium-tin-oxide (ITO)/PEDOT:PSS/nano-carbon particle:fully conjugated polymer/Al were fabricated for optical and electrical characterizations. Tri-layered structure of ITO/PEDOT:PSS/PBO/PCBM/Al produced a straight current-voltage relation showing no PV effects. Upon changing the active layer into PCBM doped P3HT layer (PCBM:P3HT), it produced good PV effects suggesting that the doped layer had a penetrating network to facilitate the PV effects. When PCBM or MWNT-COOC10H21 was doped into P3HT, the device PV effects were increased significantly with nano-carbon particle concentration. The direct-current electric conductivity parallel to the film surface (σ∥)was increased with the nano-carbon particle concentration. By changing the thickness of hole transporting PEDOT:PSS and of opto-electronically active layers, it was found that when the PEDOT:PSS layer was decreased from 90 nm to 32 nm, there was a slight increase of PV cell efficiency. The active layer of PCBM:P3HT with a thickness of 99 nm had the best optical absorption and charge transport leading to an increase of PV cell efficiency.

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15

Wang, Jia-Huei, and 汪佳慧. "Aspect Ratio Modulations of Fully Conjugated Rod-like Polymer Electrolyte for Enhanced Three-dimensionally Isotropic Ionic Conductivity." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/10080144274250998986.

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碩士<br>國立中山大學<br>材料與光電科學學系研究所<br>98<br>This study utilized polycondensation reaction to synthesize fully conjugated rod-like polymer dihydroxy-PBI. Chemical derivatizations were applied to attach pendants of propane sulfonic coil for dihydroxy-PBI-PS and to attach aromatic phenylene ring with Li ionic moiety for dihydroxy-PBI-AS. The attachment of pendants for dihydroxy-PBI-PS was 42.27 % and for dihydroxy-PBI-AS was only for 0.04 % causing by stereo hindrance of this molecule. These polymers seemed to have good thermal stability. Dihydroxy-PBI started to show degradation at 467.8 oC and retained 60.5 wt. % at 800 oC. Derivatized dihydroxy- PBI-PS and dihydroxy-PBI-AS lost their pendants at 295.3 oC and 314.4 oC, respectively. Dihydroxy-PBI was cast into thin film. Upon doping with lithium salt of LiClO at 2.02 wt. %, dihydroxy-PBI cast film showed the highest room-temperature dc conductivity parallel to the film (σ∥) of 1.71 x 10-4 S/cm and perpendicular to the film (σ⊥) of 1.49 x 10-5 S/cm. For dihydroxy-PBI-PS cast film, the highest conductivity was at 0.49 wt. % of LiClO4 with σ∥ of 1.05 x 10-3 S/cm and σ⊥ of 1.05 x 10-4 S/cm. For dihydroxy-PBI-AS cast film, the highest conductivity was at 2.02 wt. % of LiClO4 with σ∥ of 1.32 x 10-3 S/cm and σ⊥ of 2.26 x 10-5 S/cm. From scanning electron microscopy and wide-angle x-ray scattering, it was learned that cast films of dihydroxy-PBI and dihydroxy-PBI-AS had anisotropic layered structure parallel to the film, and that of dihydroxy-PBI-PS showed less of this anisotropy.

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