Diffusion coefficients of acrylic monomers in poly(methyl methacrylate)

Chen, Wen‐Chang; Lee, Shu-Jen; Ho, Bang-Ching

doi:10.1007/s10965-006-0055-6

Cited by 16 publications

(12 citation statements)

References 16 publications

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“…(10) agree better with the reported values of 10 À7 -10 À6 cm 2 /s for PMMA systems MMA [50]. (These diffusion coefficients were for PMMA of M w s 15,000 g/mol; whose polymer physical state was a mixture of up to 50% PMMA with MMA (allowed to swell the PMMA), and studied at temperatures ranging from 50 to 80 1C [50]. Please note that to our knowledge, no reported values forD have been determined for the PMMA/MMA system where PMMA is pure PMMA and of such a high molecular weight.…”

Section: Diffusion Coefficientssupporting

confidence: 89%

“…In order for the two sets of diffusion coefficients to be on the same order of magnitude, the induction period needs to be roughly 10 h. In comparing these results toD for PMMA systems reported in the literature,D s calculated according to Eq. (10) agree better with the reported values of 10 À7 -10 À6 cm 2 /s for PMMA systems MMA [50]. (These diffusion coefficients were for PMMA of M w s 15,000 g/mol; whose polymer physical state was a mixture of up to 50% PMMA with MMA (allowed to swell the PMMA), and studied at temperatures ranging from 50 to 80 1C [50].…”

Section: Diffusion Coefficientssupporting

confidence: 85%

“…Please note that to our knowledge, no reported values forD have been determined for the PMMA/MMA system where PMMA is pure PMMA and of such a high molecular weight. Chen et al's study was also a study conducted to determine diffusion coefficients of PMMA and MMA for use in GRINs [50]. )…”

Section: Diffusion Coefficientsmentioning

confidence: 99%

See 2 more Smart Citations

New insight into isothermal frontal polymerization models: Wiener's method to determine the diffusion coefficients for high molecular-weight poly(methyl methacrylate) with neat methyl methacrylate

Lewis

Massey

Meyer

et al. 2008

Optics and Lasers in Engineering

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Section: Diffusion Coefficientssupporting

confidence: 89%

Section: Diffusion Coefficientssupporting

confidence: 85%

See 1 more Smart Citation

New insight into isothermal frontal polymerization models: Wiener's method to determine the diffusion coefficients for high molecular-weight poly(methyl methacrylate) with neat methyl methacrylate

Lewis

Massey

Meyer

et al. 2008

Optics and Lasers in Engineering

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“…It has to be noted that the time scale of the reorganization is slow as compared to the reported chain diffusivities (56,57). For bulk polystyrene annealed above the glasstransition temperature it is reported to be 11.2 × 10 -13 cm 2 /s (57) and for thin films it is even lower.…”

Section: Composition Profiles As a Function Of Timementioning

confidence: 98%

Near-Surface Composition Profiles and the Adhesive Properties of Statistical Copolymer Films Being Model Systems of Pressure Sensitive Adhesive Films

Diethert

Peykova

Willenbacher

et al. 2010

ACS Appl. Mater. Interfaces

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Statistical copolymer films that consist of two types of monomers, a sticky and a glassy monomer, are investigated. These model systems of pressure-sensitive adhesive films are probed with X-ray reflectivity and mechanical tack measurements. For the first time, composition profiles along the surface normal in the near-surface region are monitored. The influence of the type of monomers being copolymerized, the monomer ratio, and the sample age on the near-surface composition as well as the resulting adhesive performance of the films are analyzed. The copolymers contain ethylhexyl acrylate as the majority component and styrene, maleic acid anhydride, or methylmethacrylate as a minority component. Regardless of the composition, we find a surface enrichment of one component in all samples. In the case of freshly prepared samples, this enrichment is driven by solubility due to the preparation based on solution casting. The minimization of the surface free energy results in an internal reorganization and the component of the statistical copolymer with the lower surface tension enriches at the free surface. The mechanical behavior is not dominated by the surface but by the surface-near part of the composition profile.

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“…For t 1 ≤ t ≤ t f , the entire set of equations for the bulk polymerization kinetics, VLE, mass transfer from liquid to vapor as well as those for the population balance, are solved simultaneously. A Gear code [32], ODE15s, in MATLAB™ is used to integrate the set of model equations with values of the system parameters given in Tables 3 [12, 23, 26, 33–35] to 5. This code selects, automatically, an appropriate (and varying) step size, dt , that corresponds to the specified accuracy.…”

Section: Formulationmentioning

confidence: 99%

Modeling the continuous entrapment and growth of gas bubbles during bulk polymerization of methyl methacrylate

Sahni

Gupta

Mehra

2011

Polymer Engineering & Sci

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Gas bubbles get entrapped continuously during bulk polymerization in stirred batch reactors. Once entrapped, these cannot escape because of the increasing viscosity of the reaction mass. The bubbles also grow with time due to the diffusion of the monomer. This phenomenon is modeled using an Eulerian‐Lagrangian population‐balance approach along with the equations describing the kinetics of polymerization. It is assumed that there is no nucleation of bubbles. An empirical rate of entrapment, Rentrap,i(viscosity, bubble diameter) is assumed for the polymerization of methyl methacrylate (MMA), an example system. The model parameters are tuned using experimental data on this system under near‐isothermal conditions in a 1‐L, fully instrumented stainless steel reactor with an anchor agitator. The model predictions are found to be in reasonable accord with experimental data under different conditions of polymerization. The study of this phenomenon has important design implications since the pre‐polymerization stage ends as soon as stable clusters of bubbles get formed. Further polymerization is normally carried out in tubular reactors or in molds. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers

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Diffusion coefficients of acrylic monomers in poly(methyl methacrylate)

Cited by 16 publications

References 16 publications

New insight into isothermal frontal polymerization models: Wiener's method to determine the diffusion coefficients for high molecular-weight poly(methyl methacrylate) with neat methyl methacrylate

New insight into isothermal frontal polymerization models: Wiener's method to determine the diffusion coefficients for high molecular-weight poly(methyl methacrylate) with neat methyl methacrylate

Near-Surface Composition Profiles and the Adhesive Properties of Statistical Copolymer Films Being Model Systems of Pressure Sensitive Adhesive Films

Modeling the continuous entrapment and growth of gas bubbles during bulk polymerization of methyl methacrylate

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