By Stuart A. Rice
This sequence offers the chemical physics box with a discussion board for serious, authoritative reviews of advances in each sector of the self-discipline. quantity 129 within the sequence maintains to record contemporary advances with major, updated chapters through the world over famous researchers.
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Extra resources for Advances in Chemical Physics 129
2. Above MC , the viscosity increases far more rapidly with M. Linear polymers with high molecular weight generally follow the well-known relation [99,103] m ¼ KM 3:4 where K is constant (independent of M). ð1:14Þ 24 myung s. 20. G0 –G00 –o plot for Zdol1 at 10 C. 21. Molecular weight dependence on viscosity for PFPE Zdol and ZdolTX. nanostructured perfluoropolyether films 25 The critical molecular weight MC has been interpreted as the molecular weight at which entanglement coupling occurs. De Gennes proposed the ‘‘reptation’’ model for tagged polymer molecule in bulk polymeric systems , and stated that the polymer motion is much like that of a snake moving in a contorted ‘‘tunnel’’ formed by the surrounding polymer molecules.
10(b) represent Z and Zdol spreading experiments on amorphous carbon disks performed by Ma et al. [49–52] a few years after the observations made by O’Connor et al. Again, the Z front (unlike O’Connor et al. [10,47,48], they used polydisperse sample) traveled along the surface, gradually decreasing in height, and the Zdol profile showed a characteristic shoulder or layering structure. However, mass buildup for Z was 10 myung s. 8. Schematic of the SME apparatus. The PFPE film is indicated in green.
Note that we denoted m as melt viscosity and Z as solution viscosity. An excellent description of the rheology is available in Ferry . From the temperature dependence of viscosity, which yields an Arrhenius form, the activation energy for flow EmÃ and the hydrodynamic volume m0 were determined as m ¼ m0 exp EmÃ RT ð1:10Þ where R is the gas constant, T is absolute temperature, and m0 ¼ NA h=V (NA is Avogadro’s number, h is Planck’s constant, and V is the molar volume). 16 [9,100]. 16. The melt viscosity dependence of PFPE Zdol and ZdolTX on temperature and molecular weight.
Advances in Chemical Physics 129 by Stuart A. Rice