scholarly journals Topological alternation from structurally adaptable to mechanically stable crosslinked polymer

Author(s):  
Wei-Hsun Hu ◽  
Ta-Te Chen ◽  
Ryo Tamura ◽  
Kei Terayama ◽  
Siqian Wang ◽  
...  
Keyword(s):  
Author(s):  
J. A. N. Zasadzinski ◽  
R. K. Prud'homme

The rheological and mechanical properties of crosslinked polymer gels arise from the structure of the gel network. In turn, the structure of the gel network results from: thermodynamically determined interactions between the polymer chain segments, the interactions of the crosslinking metal ion with the polymer, and the deformation history of the network. Interpretations of mechanical and rheological measurements on polymer gels invariably begin with a conceptual model of,the microstructure of the gel network derived from polymer kinetic theory. In the present work, we use freeze-etch replication TEM to image the polymer network morphology of titanium crosslinked hydroxypropyl guars in an attempt to directly relate macroscopic phenomena with network structure.


Author(s):  
G. M. Brown ◽  
D. F. Brown ◽  
J. H. Butler

The term “gel”, in the jargon of the plastics film industry, may refer to any inclusion that produces a visible artifact in a polymeric film. Although they can occur in any plastic product, gels are a principle concern in films where they detract from the cosmetic appearance of the product and may compromise its mechanical strength by acting as local stress concentrators. Many film gels are small spheres or ellipsoids less than one millimeter in diameter whereas other gels are fusiform-shaped and may reach several centimeters in length. The actual composition of gel inclusions may vary from miscellaneous inorganics (i.e. glass and mineral particles) and processing additives to heavily oxidized, charred or crosslinked polymer. The most commonly observed gels contain polymer differing from the bulk of the sample in its melt viscosity, density or molecular weight.Polymeric gels are a special concern in polyethylene films. Over the years and with the examination of a variety of these samples three predominant polymeric species have been observed: density gels which have different crystallinity than the film; melt-index gels in which the molecular weight is different than the film and crosslinked gels which are comprised of crosslinked polyethylene.


2021 ◽  
Author(s):  
Shengbei Qi ◽  
Chaoyong Liu ◽  
Meng Qin ◽  
Cheng Tao ◽  
Jie Liu ◽  
...  

An efficient photo-chemo combination therapeutic platform based on targeted reduction-responsive self-crosslinked four-arm PEG-PPS-cRGD nanocapsules was developed for treatment of squamous cell carcinoma.


2021 ◽  
Vol 45 (5) ◽  
pp. 2410-2416
Author(s):  
Fernanda G. Mendonça ◽  
Izadora R. S. Menezes ◽  
Ingrid F. Silva ◽  
Rochel M. Lago

Multifunctional hydrogel based on glycerol/citric acid presents absorptive and reducing capacities, affording a hybrid gel containing AgNPs in the matrix.


2017 ◽  
Vol 177 ◽  
pp. 347-354 ◽  
Author(s):  
Martina Salzano de Luna ◽  
Rachele Castaldo ◽  
Rosaria Altobelli ◽  
Lucia Gioiella ◽  
Giovanni Filippone ◽  
...  

RSC Advances ◽  
2015 ◽  
Vol 5 (5) ◽  
pp. 3888-3893 ◽  
Author(s):  
Qian Tang ◽  
Hong-Mei Nie ◽  
Cheng-Bin Gong ◽  
Hua-Dong Liu ◽  
Kun Xiao

A crosslinked polymer-based recyclable, fluorescent, and colorimetric sensor for F− in water.


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