Dynamics of cyclodimerization and viscoelasticity of photo‐crosslinkable <scp>PVA</scp>

Bai, Huiyu; Xu, Jing; Zhang, Yanxia; Liu, Xiaoya; Rojas, Orlando J.

doi:10.1002/polb.23634

Cited by 9 publications

(6 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The theoretical framework describing such a synchronization process based on statistical probabilities was initially attempted by Flory . Many efforts in correlating polymerization and conversion with global mechanical properties followed. − More refined molecular models have been developed on the relationship between polymerization and molecular dynamics, − the retardation kinetics associated with the rising glass transition temperature relative to the cure temperature, , and the gelation kinetics with viscoelastic transformation in the overall polymerization process. , These models have been used as the guidelines in research of cured thermosetting coatings and adhesives and UV curable inks. − As far as hydrogels are concerned, researchers have attempted to portray the network formation as gelation evolves and the transition from liquid to solid-like phase takes place, by establishing the correlation between the reaction kinetics and the mechanical and morphological features of the resulting cross-linked networks …”

Section: Introductionmentioning

confidence: 99%

Blue Light Initiated Photopolymerization: Kinetics and Synthesis of Superabsorbent and Robust Poly(N,N′-dimethylacrylamide/Sodium Acrylate) Hydrogels

Sun

Huang

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The kinetics of blue light and camphorquinone (CQ)/diphenyl iodonium hexafluorophosphate (DPI) initiated photopolymerization of N,N′-dimethylacrylamide (DMMA)/sodium acrylate (SA) was studied using real-time photo differential scanning calorimetry (photo-DSC) and photorheological analysis. The CQ/DPI combined photoinitiation led to a high polymerization rate and double bond conversion degree. The maximum polymerization rate (R pmax) was found to be proportional to the square root of light intensity and CQ concentration (<1.0 wt %) and the gelation kinetics was linearly proportional to light intensity and CQ concentration. Poly(DMAA/SA) hydrogels synthesized via such blue light initiated photopolymerization exhibited superior water absorbability (∼750 g/g), robust mechanical properties (∼2500% strain and ∼0.6 MPa stress), and good dimensional stability.

show abstract

Section: Introductionmentioning

confidence: 99%

Blue Light Initiated Photopolymerization: Kinetics and Synthesis of Superabsorbent and Robust Poly(N,N′-dimethylacrylamide/Sodium Acrylate) Hydrogels

Sun

Huang

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Polyvinyl alcohol (PVA) is a synthetic biocompatible polymer that is able to form physical or chemical crosslinking based on different methods such as UV‐irradiation or freeze‐thawing . Freeze thawing PVA hydrogels are a good alternative for producing biomedical composites or drug delivery devices because the process does not contain any solvent or other components that can increase the overall toxicity.…”

Section: Introductionmentioning

confidence: 99%

Composite cryogels for dual drug delivery and enhanced mechanical properties

et al. 2017

View full text Add to dashboard Cite

In this study, we present a simple and effective process that integrates hydrogels with drugs + ceramics via physical crosslinks resulting in improved mechanical properties. These cryogels have the potential for controlled drug release and stimulus responsive behavior. The hydrogels were produced from polyvinyl alcohol (PVA) and polyacrylic acid by varying the molecular weight of the polymers, via freeze‐thawing technique. The cryogels were combined with two ceramics: (1) a combination of beta‐tricalcium phosphate, wollastonite, magnesium silicate and (2) titanium dioxide nanopowder. Theophylline, a model drug, was incorporated into the structure to analyze the drug release behavior. A layered structure was produced by adding both hydrogels + ceramics into a mold where a PVA dried film acted as a barrier and reinforcing structure. The results showed that the barrier integrated between both hydrogels by a physically crosslinking mechanism. This adhesion was demonstrated using Fourier‐transform infrared spectroscopy and scanning electron microscopy. Swelling of this composite showed the profile of drug release from both hydrogels + ceramics while simultaneously releasing the drug independently without diffusing via the opposite layer. Finally, mechanical properties were improved with the addition of the ceramics, which demonstrates the potential approach in terms of modification of weak hydrogel systems. POLYM. COMPOS., 39:E210–E220, 2018. © 2017 Society of Plastics Engineers

show abstract

“…Commercially it is used for manufacturing screen-printing emulsions, but due to its excellent ability to form films and its adhesive properties, it is also used for biomedical coatings or controlled drug release . Also it has been reported as a coating during QCM measurements . SDS is a well-known detergent for lysing cells, which should enhance the efficiency of bacteria removal.…”

Section: Resultsmentioning

confidence: 99%

“…22 Also it has been reported as a coating during QCM measurements. 23 SDS is a well-known detergent for lysing cells, which should enhance the efficiency of bacteria removal. Previous research also employed (more concentrated) SDS/ NaOH mixture to remove lipopolysaccharide and lipoteichoic acid from imprints in Epon1002F.…”

Section: Resultsmentioning

confidence: 99%

Surface Imprints: Advantageous Application of Ready2use Materials for Bacterial Quartz-Crystal Microbalance Sensors

Poller

Spieker

Lieberzeit

et al. 2016

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Four different materials (two ab initio synthesized polyurethanes; ready-to-use: Epon1002F and poly(vinyl alcohol)/N-methyl-4(4'-formylstyryl)pyridinium methosulfate acetal) for the generation of Escherichia coli surface imprints are compared in this work. The use of commercially available, ready-to-use materials instead of self-synthesized polymers represents an innovative and convenient way of molecular imprint fabrication. This was herein investigated for large, biological templates. Fully synthesized imprint materials (polyurethanes) were developed and optimized regarding their OH excess and the use of catalyst in the polymerization reaction. No to low OH excess (0-10%) and a noncatalyzed synthesis were determined to be superior for the imprinting of the Gram-negative bacteria. Imprints were characterized using atomic force microscopy, with Epon1002F yielding the most distinguished imprints, along with a smooth surface. The imprints were afterward tested as plastic antibody coatings in a mass-sensitive quartz-crystal microbalance measurement. Dilutions of E. coli suspensions, down to a limit of detection of 1.4 × 10 CFU/mL, were successfully measured. Best results were obtained with Epon1002F and self-synthesized, stoichiometric polyurethane. Since ready-to-use Epon1002F was superior in terms of signal intensities and sensitivity, it can advantageously replace self-synthesized polymers for the generation of imprinted sensor surfaces. Easy day-to-day reproducibility and further shortening of imprint fabrication time are other advantages of employing the ready-to-use material instead of conventionally synthesized polymers.

show abstract

Dynamics of cyclodimerization and viscoelasticity of photo‐crosslinkable PVA

Cited by 9 publications

References 51 publications

Blue Light Initiated Photopolymerization: Kinetics and Synthesis of Superabsorbent and Robust Poly(N,N′-dimethylacrylamide/Sodium Acrylate) Hydrogels

Blue Light Initiated Photopolymerization: Kinetics and Synthesis of Superabsorbent and Robust Poly(N,N′-dimethylacrylamide/Sodium Acrylate) Hydrogels

Composite cryogels for dual drug delivery and enhanced mechanical properties

Surface Imprints: Advantageous Application of Ready2use Materials for Bacterial Quartz-Crystal Microbalance Sensors

Contact Info

Product

Resources

About