Mesh size distribution determination of interpenetrating polymer network hydrogels

Soft Matter ◽  
2012 ◽  
Vol 8 (29) ◽  
pp. 7708 ◽  
Author(s):  
Laura Pescosolido ◽  
Luigi Feruglio ◽  
Rossella Farra ◽  
Simona Fiorentino ◽  
Italo Colombo ◽  
...  
Keyword(s):  
Size Distribution ◽  
Polymer Network ◽  
Mesh Size ◽  
Interpenetrating Polymer Network

Systematic synthesis of pectin-g-(sodium acrylate-co-N-isopropylacrylamide) interpenetrating polymer network for superadsorption of dyes/M(ii): determination of physicochemical changes in loaded hydrogels

2017 ◽  
Vol 8 (20) ◽  
pp. 3211-3237 ◽  
Author(s):  
Nayan Ranjan Singha ◽  
Mrinmoy Karmakar ◽  
Manas Mahapatra ◽  
Himarati Mondal ◽  
Arnab Dutta ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Polymer Network ◽  
Interpenetrating Polymer Network ◽  
Sodium Acrylate ◽  
Physicochemical Changes ◽  
Systematic Synthesis

Superadsorbent hydrogel with excellent physicochemical properties is used for mere/synergic chemisorption of dyes and M(ii).

scholarly journals Synthesis and Structure of Organic-Inorganic Hybrid Semi-interpenetrating Polymer Network Gels

2016 ◽  
Vol 8 (1) ◽  
pp. 165 ◽  
Author(s):  
Naofumi Naga ◽  
Yukie Uchiyama ◽  
Yuri Takahashi ◽  
Hidemitsu Furukawa
Keyword(s):  
Molecular Weight ◽  
Network Structure ◽  
Polymer Network ◽  
Mesh Size ◽  
Polymer Chains ◽  
Relaxation Peak ◽  
Interpenetrating Polymer Network ◽  
Solution Temperature ◽  
High Concentration ◽  
Transition Networks

Semi-interpenetrating polymer network (semi-IPN) gels have been synthesized using a hydrosilylation reaction of 1,3,5,7-tetramethylcyclotetrasiloxane (TMCTS) as a joint molecule, and a,w-nonconjugated dienes, 1,5-hexadiene (HD) or 1,9-decadiene (DD) as linker molecules in the presence of polystyrene (PS) as a liner polymers in toluene or cyclohexane. Network structure, mesh size and mesh size distribution, of the resulting semi-IPN gels was quantitatively characterized by means of a scanning microscopic light scattering (SMILS). The relaxation peaks derived from three kinds of structures were detected in the semi-IPN gels prepared in toluene by the SMILS analysis. One was derived from the mesh formed by TMCTS/a,w-nonconjugated dienes about 1-2 nm. Others were derived from transition networks about 20-150 nm and large clustered liner polymer chains about 700-2300 nm. Effect of concentration and molecular weight of the liner polymer on the network structure of the semi-IPN gels in toluene was investigated. The relaxation peaks derived from transition networks or random coils formed by aggregated PS chains were detected in the semi-IPN gels containing high concentration or high molecular weight PS. The semi-IPN gels containing PS were also prepared in cyclohexane as a poor solvent for PS at 40ºC, which was a higher temperature than the upper critical solution temperature (UCST = 34ºC) of PS in cyclohexane. The network structure of the semi-IPN gels was traced by SMILS on the cooling process. In the semi-IPN gel with the short linker molecule of HD, the relaxation peak derived from clustered PS chains was detected over the UCST. By contrast, the relaxation peak derived from transition network was observed in the semi-IPN gel with the long linker molecule of DD.

Advances in interpenetrating polymer network hydrogels and their applications

2014 ◽  
Vol 86 (11) ◽  
pp. 1707-1721 ◽  
Author(s):  
Ecaterina Stela Dragan
Keyword(s):  
Mechanical Properties ◽  
Drug Loading ◽  
Polymer Network ◽  
Mesh Size ◽  
Ionic Species ◽  
Interpenetrating Polymer Network ◽  
The Novel ◽  
Artificial Cornea ◽  
Separation Processes ◽  
Highly Stretchable

Abstract Interpenetrating polymer network (IPN) hydrogels brought distinct benefits compared to single network hydrogels like more widely controllable physical properties, and (frequently) more efficient drug loading/release. However, IPN strategy is not sufficient to design hydrogels with enhanced mechanical properties required for regenerative medicine like replacement of natural cartilage or artificial cornea. Some of the novel techniques promoted last decade for the preparation of IPN hydrogels which fulfill these requirements are discussed in the review. Among them, “double network” strategy had a strong contribution in the development of a large variety of hydrogels with spectacular mechanical properties at water content up to 90 %. Using cryogelation in tandem with IPN strategy led to composite cryogels with high mechanical properties and high performances in separation processes of ionic species. Highly stretchable and extremely tough hydrogels have been obtained by combining a covalently cross-linked synthetic network with an ionically cross-linked alginate network. IPN hydrogels with tailored mesh size have been also reported.

scholarly journals Use of low-field NMR for the characterization of gels and biological tissues

ADMET & DMPK ◽  
2018 ◽  
Vol 6 (1) ◽  
pp. 34 ◽  
Author(s):  
Michela Abrami ◽  
Gianluca Chiarappa ◽  
Rossella Farra ◽  
Gabriele Grassi ◽  
Paolo Marizza ◽  
...  
Keyword(s):  
Size Distribution ◽  
Mesh Size ◽  
Pulmonary Diseases ◽  
Theoretical Interpretation ◽  
Polymeric Network ◽  
Low Field ◽  
Chronic Pulmonary Diseases ◽  
Lf Nmr

The focus of this paper is on the theoretical interpretation of Low Field Nuclear Magnetic Resonance (LF-NMR) data regarding hydrogels architecture and on the most interesting applications of LF-NMR presented by this research group at the 6<sup>th</sup> IAPC Symposium held in Zagreb (HR) on September 2017. Particular attention is devoted to the determination of the mesh size distribution of gels polymeric network and the determination of the pore size distribution of microporous systems such as scaffolds, bones, and porous gels. In addition, we report on a very recent application of LF-NMR for monitoring lung functioning in patients suffering from chronic pulmonary diseases like cystic fibrosis. The main findings of this work consist in providing a very simple and accurate approximation of a general theory devoted to evaluating the relation existing among four fundamental polymeric network parameters, i.e. the polymer volume fraction inside the hydrogel, mesh size, hydraulic radius, and the radius of the cylinder ideally embedding each polymeric network chain. Furthermore, we demonstrated the potentiality of LF-NMR in the characterization of different polymeric systems among which the sputum of patients suffering from chronic pulmonary diseases appears the most innovative application for its simplicity, rapidity, effectiveness, and potential impact in the everyday clinic.

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