1、(PDF) Effect of Polyvinyl Acetate Stabilization on the Swelling

In this study, polyvinyl acetate as a nontraditional chemical stabilizer was used in soil improvement. Laboratory tests were carried out to evaluate the effect of polyvinyl acetate on...

2、Effect of Polyvinyl Acetate Stabilization on the Swelling

Recently, aqueous polymers which can provide these functions under the suitable physicochemical conditions have been analyzed as stabilizers for the control of the swelling-shrinkage of clayey soils [ – ].

3、Influence of solvent quality on the swelling and shear modulus of

We quantified the swelling and deswelling of PVAc gels relative to their size at the theta temperature, and also determined the effect of T on the shear modulus of these gels.

4、Influence of solvent quality on the swelling and deswelling and the

We systematically examine the influence of varying temperature (T) over a large range in model poly (vinyl acetate) gels swollen in isopropyl alcohol.

5、Effect of Polyvinyl Acetate Stabilization on the Swelling

In this study, polyvinyl acetate as a nontraditional chemical stabilizer was used in soil improvement. Laboratory tests were carried out to evaluate the effect of polyvinyl acetate on swelling-shrinkage properties of expansive soil.

Swelling affects pvac anti

There are two kinds of swelling: infinite swelling: linear polymers dissolved in a good solvent, unrestricted absorption of solvent until dissolved into homogeneous solution. Therefore, dissolution can also be regarded as the result of unlimited swelling of polymers.

[PDF] Effect of Polyvinyl Acetate Stabilization on the Swelling

In this study, polyvinyl acetate as a nontraditional chemical stabilizer was used in soil improvement. Laboratory tests were carried out to evaluate the effect of polyvinyl acetate on swelling-shrinkage properties of expansive soil.

Influence of solvent quality on the swelling and deswelling and the

We systematically examine the influence of varying temperature (T) over a large range in model poly (vinyl acetate) gels swollen in isopropyl alcohol.

Effects of the Preparation Conditions and Reinforcement Mechanism of

In order to satisfy the current situation, the concentration of polyvinyl acetate (CPVAc) was set to 10%, 20%, and 30%, respectively, and water was additionally set as the reference group.

8128020.dvi

Laboratory tests were carried out to evaluate the efect of polyvinyl acetate on swelling-shrinkage properties of expansive soil.

Polyvinyl acetate (PVAc) is a common polymer known for its excellent film-forming properties and good mechanical performance. Due to its unique chemical structure and properties, PVAc has widespread applications in many fields. PVAc tends to exhibit swelling phenomena under high temperatures, which can degrade its performance and shorten its service life. This article introduces the swelling behavior of PVAc, its impacts, and proposes corresponding solutions.

1. Swelling Phenomenon of PVAc

Under high temperatures, PVAc undergoes swelling, characterized by weakened interactions between molecular chains. This enhances the mobility of chain segments, leading to volume expansion. Swelling typically occurs when PVAc exceeds its glass transition temperature (Tg). When subjected to external forces or elevated temperatures, increased molecular chain mobility causes PVAc to expand in volume.

2. Impacts of Swelling

1. Degraded Physical Properties: Swelling reduces PVAc’s melting point, glass transition temperature, mechanical strength, heat resistance, and solvent resistance.

2. Restricted Applications: Swelling limits PVAc’s utility in coatings, adhesives, textiles, and other fields. measures must be taken to mitigate this issue.

3. Solutions

1. Increase Tg: Adding plasticizers, cross-linking agents, or other modifiers can elevate PVAc’s glass transition temperature, reducing swelling.

2. Control Processing Conditions: Adjusting temperature, pressure, and other parameters during processing (e.g., lowering processing temperatures under high heat) can suppress swelling.

3. Select Appropriate Additives: Incorporating antioxidants, thermal stabilizers, or free radical scavengers can inhibit oxidative reactions and improve stability.

4. Optimize Formulations: Modifying PVAc compositions (e.g., adjusting monomer ratios or adding plasticizers) enhances physical properties and stability.

5. Extend Service Life: Regular inspections and timely maintenance can address swelling-related issues, ensuring sustained performance and safety.

Swelling negatively impacts PVAc’s performance and longevity. By increasing Tg, optimizing processing conditions, using additives, refining formulations, and implementing maintenance protocols, swelling can be effectively mitigated. These strategies enable PVAc to maintain its versatility across diverse applications.