Second virial coefficient of arborescent polystyrenes and its temperature dependence
Article Abstract:
Arborescent polymers were studied in terms of their solution behavior and second virial coefficient (A2) differentiation with polymer structure, type of solvent and temperature. The careful evaluation of A2 in relation to enthalpy and entropy contributions using a proposed scheme was effective in providing an insight into the thermodynamic aspects influencing the solubility activity of polymers. It was observed that the entropy component uniformly decreased in both poor and good solvents as result of branching while the enthalpy component did not intensely change with branching.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Temperature dependence of small-angle neutron scattering of tetramethylurea in carbon disulfide solution
Article Abstract:
A temperature-dependent small-angle neutron scattering examination was used to investigate dilute solutions of deuterated TMU in CS2. The solutions presented scattering curves indicating that D-TMU dimers are present in addition to monomers. The D-TMU molecules are divided by two CS2 molecules, a configuration suggested by the radius of gyration of the dimers. The results indicate that liquid water has an important role in hydrophobic interaction.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Chromatographic investigation of CO2-polymer interactions at near-critical conditions
Article Abstract:
Research was conducted to examine the solubility of carbon dioxide in PMMA using a chromatographic method, namely, mass spectrometric tracer pulse chromatography, MSTPC, over a wide range of temperatures. The objective of the study is to establish the validity of the chromatographic method to measure the sorption of gaseous or supercritical CO2 in glassy or rubbery polymers.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
User Contributions:
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