scholarly journals Influence of cross-linking on the segmental dynamics in model polymer networks

2000 ◽  
Vol 113 (1) ◽  
pp. 447-452 ◽  
Author(s):  
V. Yu Kramarenko ◽  
T. A. Ezquerra ◽  
I. Šics ◽  
F. J. Baltá-Calleja ◽  
V. P. Privalko
Keyword(s):  
Polymer Networks ◽  
Cross Linking ◽  
Segmental Dynamics

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...

Depolymerizable, adaptive supramolecular polymer nanoparticles and networks

2014 ◽  
Vol 5 (12) ◽  
pp. 3788-3794 ◽  
Author(s):  
Joshua A. Kaitz ◽  
Catherine M. Possanza ◽  
Yang Song ◽  
Charles E. Diesendruck ◽  
A. Jolanda H. Spiering ◽  
...  
Keyword(s):  
Polymeric Nanoparticles ◽  
Polymer Networks ◽  
Polymer Nanoparticles ◽  
Cross Linking ◽  
Supramolecular Polymer ◽  
Single Chain ◽  
Degradable Polymer

Depolymerizable polymers are appended with supramolecular cross-linking motifs to enable preparation of tunable single-chain polymeric nanoparticles and degradable polymer networks.

Alterations in Physical Cross-Linking Modulate Mechanical Properties of Two-Phase Protein Polymer Networks

2005 ◽  
Vol 6 (6) ◽  
pp. 3037-3044 ◽  
Author(s):  
Xiaoyi Wu ◽  
Rory Sallach ◽  
Carolyn A. Haller ◽  
Jeffrey A. Caves ◽  
Karthik Nagapudi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polymer Networks ◽  
Cross Linking ◽  
Two Phase ◽  
Protein Polymer ◽  
Phase Protein

scholarly journals Microencapsulation Curcuminoids for Effective Delivery in Pharmaceutical Application

Pharmaceutics ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 451 ◽  
Author(s):  
Ang ◽  
Darwis ◽  
Por ◽  
Yam
Keyword(s):  
Drug Delivery ◽  
Drug Delivery System ◽  
Delivery System ◽  
Release Kinetics ◽  
Polymer Networks ◽  
Active Agent ◽  
Antibacterial Properties ◽  
Light Sensitivity ◽  
Thick Wall ◽  
Cross Linking

Curcuminoids have been long proven to possess antioxidant, anti-inflammatory and antibacterial properties which are crucial in their role as a pharmacological active agent. However, its poor solubility, high oxidative degradation, light sensitivity and poor bioavailability have been huge hurdles that need to be overcome for it to be administered as an oral or even a topical medication. In this present study, a complex coacervation microencapsulation approach was used to encapsulate the curcuminoids using both gelatin B and chitosan (at the optimum ratio of 30:1% w/w) for a more efficient drug delivery system. Curcuminoids microcapsules (CPM) were developed to be spherical in shape, discrete and free flowing with a reduced color staining effect. The thick wall of the CPM contributes directly to its integrity and stability. Cross-linking increases the density of polymers’ wall network, hence, further increasing the decomposition temperature of curcuminoids microcapsules. Microencapsulation demonstrated an increment in curcuminoids solubility, while chemical cross-linking allowed for sustained release of the drug from the microcapsules by lowering the swelling rate of the available polymer networks. Thus, the microcapsules complied with the zero order release kinetics with super case-II transport mechanism. On the basis of all that was discussed above, it can be safely concluded that CPM should be incorporated in delivery system of curcuminoid, especially in its topical delivery for controlled drug release purposes, for not only a more efficient drug delivery system design but also a more efficacious optimization of the pharmacological benefits of curcuminoids.

Neutron Reflection Studies of Swelling of Chemically End-Grafted Polymer Chains

1994 ◽  
Vol 376 ◽  
Author(s):  
Alamgir Karim ◽  
S.K. Satija ◽  
P. Gallagher ◽  
J.F. Douglas ◽  
L.J. Fetters
Keyword(s):  
Polymer Networks ◽  
The Body ◽  
Polymer Chains ◽  
Cross Linking ◽  
Neutron Reflection ◽  
Grafted Polymer ◽  
Solvent Quality ◽  
Grafting Density ◽  
Fluctuation Effects ◽  
Theta Solvent

ABSTRACTNeutron reflection is used to compare the swelling of two chemically end-grafted polystyrene brushes having different grafting densities exposed to a theta solvent cyclohexane and to a good solvent toluene. The relative swelling of tie brushes with a variation of solvent quality becomes smaller and the temperature dependence becomes weaker with an increase of grafting density. This type of swelling is very similar to polymer networks where an increase of cross-linking density leads to a decreased range of swelling and diminished dependence of the swelling. Our model density profile fits to the body of both brushes is parabolic in a good solvent so that some fluctuation effects, as found generally in lower density brushes, are obtained as the brush expands.

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