1、Freeze/thawed polyvinyl alcohol hydrogels: Present, past and future

This cycle is carried out several times (generally ranging from 3 to 9 times) to ensure that a strong and stable gel is achieved. Depending on the cycle duration, the F-T process may take up to several days, and thus the mold should be sealed to prevent water loss and shrinkage of the gel over time [32].

2、Determination of gelation dose of poly(vinyl acetate) by a

When crosslinking and discoloration take place simultaneously, gelation doses can be determined spectrophotometrically. In this work it is demonstrated that the gelation dose of poly (vinyl acetate) can be determined by simply recording the u.v.-vis. spectra of the solutions of γ-irradiated polymer.

3、Physical Gelation of Poly (Vinyl Alcohol

In this work, physically cross-linked hydrogels are prepared using a poly (vinyl alcohol) (PVA) matrix, varying the freeze-thaw cycles and sonication times of the polymer solution.

4、Effect of emulsion polymerization conditions of vinyl acetate on the

Viscosity and its fluctuation of PVAs with aging time varied with the polymerization temperature of the precursors, concentration of the aqueous solutions, and aging time.

Effect of emulsion polymerization conditions of vinyl acetate on the

Viscosity and its fluctuation of PVAs with aging time varied with the polymerization temperature of the precursors, concentration of the aqueous solutions, and aging time.

Freeze/thawed polyvinyl alcohol hydrogels: Present, past and future

PVA gelation through repeated F-T occurs without an externally added crosslinking agent due to the molecular structure and ability of PVA solutions to crystallize, resulting in ultrapure hydrogels.

Polyvinyl Alcohol (PVA)

In view of the significant progress that has, this review aims to provide a comprehensive overview of the recent developments in PVA-based hydrogels. It will focus on the fabrication methods employed, the enhancements made to their properties, and the various applications in which they are used.

Determination of gelation dose of poly (vinyl acetate) by a

The gelation point is an important property of polymers undergoing crosslinking when subjected to high energy radiation. This point is generally determined by viscometric and solubility methods or by mechanic measurements.

Freeze/thawed polyvinyl alcohol hydrogels: Present, past and Author

rogels prepared by the freezing/thawing (F-T) process is presented. We discuss their preparation, gelation mechanisms, handling of physical/mechanical pr.

Gelation time characterization method for polyvinyl alcohol

Conclusions: In conclusion, the proposed gelation time method could be successfully applied to the PVA-based hydrogel and performed as a preliminary characterization technique for hydrogel...

In modern industry, the performance of materials directly affects the quality and safety of products. Polyvinyl acetate (PVAc), as a critical high-molecular-weight material, has its gelation time as a key performance indicator in industrial applications. This article explores the gelation time of PVAc and analyzes its impact on material properties.

I. Definition and Importance of PVAc Gelation Time

Polyvinyl acetate is a thermoplastic polymer with excellent chemical stability and mechanical properties. its gelation time significantly influences its processing and application. Gelation time refers to the duration required for transitioning from a molten state to a solid state, determining whether the material can be rapidly and uniformly processed into the desired shape.

II. Impact of Gelation Time on PVAc Performance

1. Production Efficiency: Excessive gelation time leads to sticky flow phenomena during processing, reducing efficiency and potentially degrading product quality. Shortening gelation time is thus crucial for improving productivity.

2. Molding Quality: Gelation time directly affects post-molding product quality. Overly short gelation times may induce excessive internal stress, compromising the mechanical properties and service life of the product.

3. Energy Consumption: Prolonged gelation time increases energy use during heating, raising production costs. Optimizing gelation time can effectively reduce energy consumption.

4. Environmental Impact: Extended gelation time correlates with higher energy consumption and waste generation, harming the environment. Developing new gelation technologies to minimize energy use and pollution is a pressing research focus.

III. Research Advances in Gelation Time

Recent years have seen intensive studies on PVAc gelation time. By refining polymerization processes, adjusting formulations, and employing novel catalysts, researchers have successfully shortened gelation times while enhancing productivity and product quality. Additionally, innovative techniques like microwave curing and infrared curing have achieved remarkable results.

IV. Future Prospects

With technological advancements, future research on PVAc gelation time will prioritize efficiency and environmental sustainability. Examples include leveraging nanotechnology and bio-based materials to improve mechanical properties and ecological compatibility, adopting intelligent control systems for precise gelation management, and exploring green curing agents.

gelation time is a pivotal factor in determining PVAc’s performance. Through in-depth research and technological innovation, gelation time optimization can enhance production efficiency, molding quality, and environmental friendliness. As new materials and technologies emerge, PVAc’s applications will expand further, contributing more significantly to human progress.