Compatibility of polyvinyl alcohol and poly(methyl vinyl ether- co-maleic acid) blends estimated by molecular dynamics

The CSIR has developed a novel oxygen barrier technology for plastics packaging based on interpolymer complex formation between PVOH (polyvinyl alcohol) and PMVE-MA (poly(methyl vinyl ether- co-maleic acid)). As interpolymer complexation interactions are strongly dependent on stoichiometric ratios,...

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Vydáno v:Polymer (Guilford) Ročník 46; číslo 16; s. 6192 - 6200
Hlavní autoři: Moolman, F.S., Meunier, M., Labuschagne, P.W., Truter, P.-A.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Oxford Elsevier Ltd 25.07.2005
Elsevier
Témata:
Applied sciences
Exact sciences and technology
Hydrogen bonding
Interpolymer complexation
Molecular dynamics
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
Molecular dynamics
Hydrogen bonding
Interpolymer complexation
Polymer blends
Property composition relationship
Computer simulation
Molecular dynamics method
Energy density
Experimental study
Polyelectrolyte
Polyvinylalcohol
Vinyl ether copolymer
Alternating copolymer
Interpolymer
Maleic acid copolymer
Thermodynamic properties
Cohesive energy
Interaction parameter
ISSN:0032-3861, 1873-2291
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Shrnutí:The CSIR has developed a novel oxygen barrier technology for plastics packaging based on interpolymer complex formation between PVOH (polyvinyl alcohol) and PMVE-MA (poly(methyl vinyl ether- co-maleic acid)). As interpolymer complexation interactions are strongly dependent on stoichiometric ratios, the estimation of the optimum blend ratio is an important component of blend design. This study used molecular dynamics modelling to predict the ratio of optimum interaction for PVOH:PMVE-MA blends. Amorphous cells were constructed containing blends of short-chain repeat units of PVOH and PMVE-MA. The oligomers were equilibrated using both NVT and NPT dynamics and the cohesive energy densities (CED's) of the models were computed. From the CED's, energies of mixing and Flory–Huggins Chi Parameter ( χ) values were estimated. The χ-values were negative for all blends, indicating favorable interaction between the two polymers. The minimum χ-values were found around 0.6–0.7 mass fraction of PMVE-MA, which agrees well with experimental viscosity results (this work), which indicated optimum interaction around 0.7 mass fraction PMVE-MA. These results confirm that molecular dynamics can be used as a tool for investigating interpolymer complexation phenomena.
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ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2005.03.121