Tethered chains in polymer microstructures

2006 ◽  
pp. 31-71 ◽  
Author(s):  
A. Halperin ◽  
M. Tirrell ◽  
T. P. Lodge
Keyword(s):  
Polymer Microstructures ◽  
Tethered Chains

Static and dynamic properties of tethered chains at adsorbing surfaces: A Monte Carlo study

2004 ◽  
Vol 120 (18) ◽  
pp. 8831-8840 ◽  
Author(s):  
Radu Descas ◽  
Jens-Uwe Sommer ◽  
Alexander Blumen
Keyword(s):  
Monte Carlo ◽  
Dynamic Properties ◽  
Monte Carlo Study ◽  
Tethered Chains

A Computational Model for High Speed Screening of Polymer Microstructures

2004 ◽  
Vol 25 (1) ◽  
pp. 377-381 ◽  
Author(s):  
Kegang Wang ◽  
Martin E. Glicksman ◽  
Krishna Rajan
Keyword(s):  
Computational Model ◽  
High Speed ◽  
Polymer Microstructures

scholarly journals Synthesis and Physico-Chemical Evaluation of Polyurethane Microstructures for Transmembrane Delivery of Reynoutria japonica Extract

2017 ◽  
Vol 54 (4) ◽  
pp. 651-654
Author(s):  
Florina Ardelean ◽  
Razvan Susan ◽  
Florin Borcan ◽  
Alina Moaca ◽  
Diana Simona Antal ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Invasive Plant ◽  
Aqueous Solubility ◽  
Japanese Knotweed ◽  
Reynoutria Japonica ◽  
Good Thermal Stability ◽  
Starting Point ◽  
First Results ◽  
Polymer Microstructures ◽  
Transmembrane Delivery

Polymer microstructures containing plant extracts are a novel technique used to increase the bioavailability of active agents with low aqueous solubility. Japanese knotweed (Reynoutria japonica) is an invasive plant with multiple biomedical properties. The aim of the present study was to obtain and characterize polyurethane microstructures used as a drug delivery system of a Japanese knotweed extract. The results indicate the obtaining of microstructures with an almost neutral pH, with sizes between 540 and 1134 nm, with a medium stability against the tendency to form clusters and a very good thermal stability. These first results present the potential of the obtained polyurethane microstructures as candidates for the transmembrane drug delivery of Japanese knotweed extracts, as a starting point for further bioactivity investigations.

scholarly journals Influence of the Architecture of Soft Polymer-Functionalized Polymer Nanoparticles on Their Dynamics in Suspension

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1844
Author(s):  
Young-Gon Kim ◽  
Waraporn Wichaita ◽  
Héloïse Thérien-Aubin
Keyword(s):  
Correlation Time ◽  
Nmr Relaxation ◽  
Thick Layer ◽  
Polymer Chains ◽  
The Core ◽  
Grafting Density ◽  
Tethered Polymer Chains ◽  
Close Proximity ◽  
Soft Polymer ◽  
Tethered Chains

The behavior of nanogels in suspension can be dramatically affected by the grafting of a canopy of end-tethered polymer chains. The architecture of the interfacial layer, defined by the grafting density and length of the polymer chains, is a crucial parameter in defining the conformation and influencing the dynamics of the grafted chains. However, the influence of this architecture when the core substrate is itself soft and mobile is complex; the dynamics of the core influences the dynamics of the tethered chains, and, conversely, the dynamics of the tethered chains can influence the dynamics of the core. Here, poly(styrene) (PS) particles were functionalized with poly(methyl acrylate) (PMA) chains and swollen in a common solvent. NMR relaxation reveals that the confinement influences the mobility of the grafted chain more prominently for densely grafted short chains. The correlation time associated with the relaxation of the PMA increased by more than 20% when the grafting density increased for short chains, but for less than 10% for long chains. This phenomenon is likely due to the steric hindrance created by the close proximity to the rigid core and of the neighboring chains. More interestingly, a thick layer of a densely grafted PMA canopy efficiently increases the local mobility of the PS cores, with a reduction of the correlation time of more than 30%. These results suggest an interplay between the dynamics of the core and the dynamics of the canopy.

scholarly journals Fabrication of high aspect-ratio polymer microstructures for large-area electronic portal X-ray imagers

2007 ◽  
Vol 140 (2) ◽  
pp. 185-193 ◽  
Author(s):  
J.H. Daniel ◽  
A. Sawant ◽  
M. Teepe ◽  
C. Shih ◽  
R.A. Street ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Large Area ◽  
X Ray ◽  
Polymer Microstructures
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