<i><scp>PVT</scp></i>Relationships and Equations of State of Polymers

Cho, Junhan; Sánchez, Isaac C.

doi:10.1002/0471532053.bra048

Cited by 5 publications

(4 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This behavior is typical for ceramic injection molding feedstocks because their polymeric binder consists of more than one component, typically a low melting wax based part to increase flow-ability of the compound and a thermoplastic part that increases the stability during demolding. Standard mathematical methods like the two-domain Tait equation (McKinney and Simha 1997;Cho and Sanchez 1999;Beret and Prausnitz 1975) that allow the implementation of state of matter diagrams in CFD tools (e.g., MOLDFLOWÒ) cannot describe multi-phase compounds correctly.…”

Section: Injection Molding Experimentsmentioning

confidence: 99%

Micro powder injection molding: process characterization and modeling

et al. 2006

View full text Add to dashboard Cite

The development of a new simulation tool for micro powder injection molding (MicroPIM) needs experimental material data and verification experiments to describe the process correctly. A new and innovative approach is to use dissipative particle dynamics (DPD) to describe the form filling process with respect to the interactions on a mesoscopic scale (Hoogerbrugge and Koelman in Europhys Lett 19 (1): [155][156][157][158][159][160] 1992). The individual parameters that enter DPD modeling of this process have to be adjusted using specially designed experiments for the injection molding process. The material properties in the standard injection molding process are primarily determined by the bulk material. In micro dimensions surface effects begin to dominate because of the large surface to volume ratio. Therefore, the surface interactions between feedstock and mold insert were studied. Finally, first observations of the injection molding experiments are shown and qualitatively compared to DPD simulation results.

show abstract

Section: Injection Molding Experimentsmentioning

confidence: 99%

Micro powder injection molding: process characterization and modeling

et al. 2006

View full text Add to dashboard Cite

show abstract

“…If the swollen P(EA–MMA) and PEA formed fully IPN structure with homogeneous mixing, volume fraction of P(EA–MMA) in the particle can be calculated by using the swelling ratio l / l 0 of CP( x )-S and expected volume change from EA to PEA (density ρ = 0.92 and 1.12 g/cm 3 , respectively) by polymerization and evaluated to be 0.21–0.36. These low values suggest that the P(EA–MMA) particles may be softened at room temperature by mixing with PEA having low T g , which means that all of the colloidal crystal elastomer is in the rubbery state.…”

Section: Discussionmentioning

confidence: 97%

Strain-Responsive Structural Colored Elastomers by Fixing Colloidal Crystal Assembly

et al. 2013

View full text Add to dashboard Cite

Colloidal crystal assembly film was prepared by using monodispersed colloidal particles of cross-linked random copolymer of methyl methacrylate and ethyl acrylate prepared by soap-free emulsion polymerization. The colloidal crystal film exhibited structural color when swollen with ethyl acrylate monomer. The structural color was maintained even after polymerization of the swelling monomer and cross-linker, suggesting the colloidal crystalline order was successfully fixed and embedded in the matrix of poly(ethyl acrylate) elastomer. Stretching deformation of the structural colored elastomer induced a sensitive change to shorter wavelength color. Peak wavelength of the UV-vis absorption spectrum of the stretched elastomer revealed an excellent proportional relationship with film thickness. In the swollen colloidal crystal film, ethyl acrylate was absorbed in the colloidal particle; therefore, poly(ethyl acrylate) chain should be penetrating into the colloidal particle after the polymerization of the matrix elastomer. This interpenetrated polymer network structure was considered to be effective for the rubber-like elasticity and sensitive strain-responsive color-changing phenomena of the structural colored elastomer.

show abstract

“…One thing that all of the equation of states have in common is that the dimensionless variables of temperature, pressure, and volume are obtained by dividing the real p , V , and T data by reducing the parameters p *, V *, and T * in the form of trueV˜= V/V*, trueT˜= T/T*, and truep˜= p/p*. Overviews of reduced parameters and their underlying theories and approaches can be found in handbooks and reviews [4,5,6]. All of the fitting procedures have the disadvantage that they are only valid for equilibrium states, and that the fitting result depends on the set of data points used.…”

Section: Introductionmentioning

confidence: 99%

Determination of Pressure Dependence of Polymer Phase Transitions by pVT Analysis

Pionteck

2018

Polymers

View full text Add to dashboard Cite

Glass transitions, melting, crystallization, and the isotropization of polymers are connected with changes in the density, respectively the specific volume (V sp ), which can be analyzed by dilatometric methods. Here, the pressure dependence of such transitions is determined by pressure volume temperature (pVT) analysis for different thermoplastic polymers in the pressure range of 10 to 200 MPa, and the temperature range from room temperature to 350 °C. The values for ambient pressure are extrapolated. It is shown that polymer transitions always increase with pressure, and that the melting temperature and glass transition temperature are nearly linearly dependent on pressure. This information, as well as the observed density changes with pressure and temperature, is very important for the processing of thermoplastics, including their simulation, as well as for the thermodynamic interpretations of the transition’s nature.

show abstract

PVTRelationships and Equations of State of Polymers

Cited by 5 publications

References 63 publications

Micro powder injection molding: process characterization and modeling

Micro powder injection molding: process characterization and modeling

Strain-Responsive Structural Colored Elastomers by Fixing Colloidal Crystal Assembly

Determination of Pressure Dependence of Polymer Phase Transitions by pVT Analysis

Contact Info

Product

Resources

About