Oxidative Solid-State Cross-Linking of Polymer Precursors to Pattern Intrinsically Conducting Polymers

2004 ◽  
pp. 44-53 ◽  
Author(s):  
Sung-Yeon Jang ◽  
Manuel Marquez ◽  
Gregory A. Sotzing
Keyword(s):  
Solid State ◽  
Conducting Polymers ◽  
Cross Linking ◽  
Polymer Precursors ◽  
Intrinsically Conducting Polymers

Control Over Al2O3 Phase by Use Of Polymer Precursors

1991 ◽  
Vol 249 ◽  
Author(s):  
William S. Rees ◽  
Werner Hesse
Keyword(s):  
Solid State ◽  
Ethylene Glycol ◽  
Ceramic Materials ◽  
Crystal Phase ◽  
Cross Linking ◽  
Dry Air ◽  
Polymer Precursors ◽  
Initial Polymer ◽  
Al2o3 Phase ◽  
Flowing Atmosphere

ABSTRACTReaction of Et2AIOEt with ethylene glycol or catechol produced polymers of the general form -[-AI(OEt)-O-R-O-]-n, for R = CH2CH2 or C6H4, respectively. Pyrolytic conversion of these polymers to ceramic materials produced A12O3, at mild (∼500°C) temperatures under a flowing atmosphere of dry air. The crystal phase obtained from the thermolysis is highly dependent upon the degree of cross-linking present in the initial polymer. These results are discussed in terms of the required solid-state atomic reorganization necessary to proceed from polymer to ceramic.

Solid state 13C NMR in conducting polymers

1985 ◽  
Vol 46 (9) ◽  
pp. 1595-1601 ◽  
Author(s):  
F. Devreux ◽  
G. Bidan ◽  
A.A. Syed ◽  
C. Tsintavis
Keyword(s):  
Solid State ◽  
Conducting Polymers ◽  
13C Nmr ◽  
Solid State 13C Nmr

SOLID STATE BATTERIES WITH CONDUCTING POLYMERS

1983 ◽  
Vol 44 (C3) ◽  
pp. C3-567-C3-572 ◽  
Author(s):  
F. Bénière ◽  
D. Boils ◽  
H. Cánepa ◽  
J. Franco ◽  
A. Le Corre ◽  
...  
Keyword(s):  
Solid State ◽  
Conducting Polymers ◽  
Solid State Batteries

Development and Characterization of LBG-PVA Interpenetrating Networks Incorporating Gliclazide for Sustained Release

2020 ◽  
Vol 15 ◽  
Author(s):  
Ashish Katoch ◽  
Manju Nagpal ◽  
Malkiet Kaur ◽  
Manjinder Singh ◽  
Geeta Aggarwal ◽  
...  
Keyword(s):  
Solid State ◽  
Sustained Release ◽  
Half Life ◽  
Solid State Nmr ◽  
Oral Dosage ◽  
Cross Linking ◽  
Interpenetrating Networks ◽  
Dsc Studies ◽  
Biological Half Life ◽  
Percentage Yield

Background: Controlled oral dosage forms have always been preferred for drugs with variable absorption, and short biological half life and frequent dosing. The prime goal with sustained release systems is to maintain uniform therapeutic blood levels for longer periods of time. Interpenetrating networks (IPNs) have been evidenced as uniform sustained release systems. In current study, polyvinyl alcohol (PVA) and locust bean gum (LBG) based IPNs were developed for the oral sustained release drug delivery of gliclazide (shows variable absorption). Method: The IPNs were synthesized by emulsion cross-linking method using glutaraldehyde (GA) as a cross linking agent. Gliclazide is a potential second generation, short-acting sulfonylurea oral hypoglycemic agent is having a short biological half-life (2-4 h), variable absorption and poor oral bioavailability. Various batches of IPNs were formulated by varying LBG: PVA ratio and evaluated for percentage yield, drug entrapment efficiency (DEE), swelling properties and in vitro drug release studies. Further characterizations were done by Fourier Transform Infrared Spectroscopy (FTIR), C13 Solid state NMR, X-Ray diffraction study (XRD), Scanning electron microscopy (SEM), and Differential scanning microscopy (DSC) studies. Results: The percentage yield, drug entrapment and equilibrium swelling was observed to be dependent on PVA-LBG ratio and GA amount. Sustained release of drug was observed in all IPN formulations (approx 59 - 86% in 8 h in various batches) with variable release kinetics. SEM studies revealed the regular structures of IPNs. FTIR, XRD, C13 Solid state NMR and DSC studies proposed that drug was successfully incorporated into the formed IPNs. Conclusion: IPNs of LBG and PVA can be used as a promising carrier with uniform sustained release characteristics.

Chemically Designed, UV Curable Polycarbosilane Polymers

1992 ◽  
Vol 271 ◽  
Author(s):  
Kevin J. Thorne ◽  
Stephen E. Johnson ◽  
Haixing Zheng ◽  
John D. Mackenzie ◽  
M. F Hawthorne
Keyword(s):  
Molecular Weight ◽  
Inert Atmosphere ◽  
Uv Exposure ◽  
Cross Linking ◽  
Substitution Reactions ◽  
High Solubility ◽  
Chemical Route ◽  
Uv Curable ◽  
Polymer Precursors ◽  
C Nmr

ABSTRACTTo prepare new polycarbosilane polymer precursors with high solubility and the capability of UV cross-linking, commercial polycarbosilane was modified by a chemical route. These modifications involved AlCl3 catalyzed chlorination reactions of polycarbosilane's Si-H bonds. The resultant Si-Cl bonds were substituted by a reaction with sodium acetylyde to form Si-C=CH ligands. These ligands are suitable for controlled, free radical initiated cross-linking of the polycarbosilane polymers. The increase in molecular weight should allow for increased Tg's and the retention of polymer pre-forms. In this report, the chlorination of the polycarbosilane polymer and the substitution reactions of polycarbosilane were examined with IR, 29Si and 13C NMR spectroscopy. In addition, the retention of polymer pre-forms were analyzed after UV exposure and inert atmosphere pyrolysis.

Emissive Semi-Interpenetrating Polymer Networks for Ink-Jet Printed Multilayer OLEDs

2021 ◽  
Author(s):  
Susanna V. Kunz ◽  
Cameron M. Cole ◽  
Thomas Baumann ◽  
Prashant Murlidhar Sonar ◽  
Soniya Yambem ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Organic Light Emitting Diodes ◽  
Cross Linking ◽  
Solution Processing ◽  
Light Emitting ◽  
Polymer Precursors ◽  
Organic Light ◽  
Ink Jet

Solution-processing of multilayered Organic Light Emitting Diodes (OLEDs) remains a challenge that is often addressed by cross-linking polymer precursors into insoluble networks. Herein, we blend an emissive polymer carrying a...

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