Intrinsic viscosities and unperturbed dimensions of long chain molecules

Kurata, Michio; Stockmayer, W. H.

doi:10.1007/bfb0050490

Cited by 722 publications

(12 citation statements)

References 340 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Kurata and Stockmayer (1963) Experimental evidence (Yamakawa, 1971) In Table 2, we present a comparison of the predictions of Equations (22) and (24) with the diffusivity data of Meyerhoff and Nachtigall (1962) taken on a system of toluene and narrow molecular weight fractions of polystyrene. A value of B = 2.19 x cm3 was used in Equation (22).…”

Section: Determination Of Do For Nantheta Solutionsmentioning

confidence: 98%

“…Although there exist more intrinsic viscosity data than light scattering measurements, there seems to be no completely satisfactory two-parameter theory for intrinsic viscosity (Yamakawa, 1971), and light scattering data should be used when possible. A quick and reasonable estimate of B can be deduced by utilizing intrinsic viscosity data expressed in terms of the Mark-Houwink-Sakurada (Kurata and Stockmayer, 1963) and Y are available for particular molecular weight ranges for numerous polymer-solvent pairs (Kurata and Stockmayer, 1963;Kurata et al, 1975). From empirical results for the intrinsic viscosity (Yamakawa, 1971), it is easy to show that B can be estimated from Berry (1967) and Matsumoto et al (1972) present data for homogeneous polymers which support the lower theoretical value, whereas Yamakawa (1971Yamakawa ( , 1972 claims that the best experimental value is 2.5 x loz3 molecules/g mole.…”

Section: Average Dimensions Of Polymer Choinsmentioning

confidence: 99%

“…Values of A have been tabulated by Kurata and Stockmayer (1963) and by Kurata et al (1975) lor a large number of polymers.…”

Section: Average Dimensions Of Polymer Choinsmentioning

confidence: 99%

See 2 more Smart Citations

Molecular diffusion in polymer solutions

1979

View full text Add to dashboard Cite

The growth of the polymer industry has been spectacular, and the volumetric production of polymers will soon exceed that of all metals. Initially, this growth was due mainly to the synthesis of new polymers. However, it appears that continued growth will be more directly associated with sophisticated engineering which will lead to improved processes and new applications ( h4arkovitq 1971, 1972). Diffusion coefficients for polymer solutions are required for the analysis of many polymer formation and fabrication processes. The importance of mass transfer is perhaps most prominent in the formation of polymers, where the rate of polymerization can be controlled or strongly influenced by the molecular diffusion of monomers, initiators, long chain free radicals, dead polymer chains, or low molecular weight condensation products.

show abstract

Section: Determination Of Do For Nantheta Solutionsmentioning

confidence: 98%

Section: Average Dimensions Of Polymer Choinsmentioning

confidence: 99%

See 1 more Smart Citation

Molecular diffusion in polymer solutions

1979

View full text Add to dashboard Cite

show abstract

“…It is interesting that the PAM8-2DMAPS copolymers exhibit K θ and <L 2 > 0 /M values close to those of PAM in water [K θ = (2.6 ± 0.4) × 10 −3 dL g −1.5 mol 0.5 and <L 2 > 0 / M=(1.00±0.05)×10 −2 nm 2 g −1 mol 1/3 ] by Stockmayer [71]. On the other hand, the σ value of the copolymers is slightly larger than that of 2.73 for PAM [71], which could be ascribed to the steric hindrance of the long DMAPS tail unit causing a slight increase of molecular size of PAM8-2DMAPS with a major content of the AM units. Figure 9 shows diffusion coefficient (D) as a function of square of scattering wave vector (q 2 ) from DLS measurement.…”

Section: Resultsmentioning

confidence: 91%

Synthesis and solution property of acrylamide-sulfobetaine copolymers

Song

Zheng

2014

Colloid Polym Sci

View full text Add to dashboard Cite

A b s t r a c t S u l f o b e t a i n e 3 -[ N , N -d i m e t h y l -N -( 2 -methacryloxylethyl)ammonio]-propane sulfonate (DMAPS) was used to copolymerize with acrylamide (AM) to prepare salt-sensitive copolymers. The optimal reaction conditions, such as initiator concentration, temperature, and reaction time, to achieve the largest weight averaged molecular weight (M w ) and the lowest polydispersity index (PDI) were studied. The reactivity ratios of AM and DMAPS (r 1 , r 2 ) were calculated to be (0.45, 0.84) by the Fineman-Ross method, and (0.47, 0.91) by the Kelen-Tüdös method. The Q-e values of DMAPS were calculated to be (0.30, −0.38). DMAPS was found to be more easily to add into the copolymer than AM to form random copolymers with a slight alternating tendency. Solution rheology and molecular size of the copolymers as a function of M w were studied in 1 M NaCl solution, a near θ-solution, by rotational rheometer and light scattering methods, respectively. Undisturbed dimension of the copolymers was evaluated according to Stockmayer-Fixman relation.

show abstract

“…All of them describe the relationship of the excluded volume theory to the molecular weight and intrinsic viscosity. The most used relationships are: Flory-Fox-Schaefgen, [20] Kurat-Stockmayer, [30] Cowie, [31] Berry, [32] Inagaki [33] , and Stockmayer-Fixman (SF). [34] The SF relationship is for treating data covering the usual range of molecular weights where excluded volume effects are well developed:…”

Section: Evaluation Of K θ and By Extrapolation Methodsmentioning

confidence: 99%

Characteristics of Poly(3,5-Dimethylphenylacrylate) in Ethyl Acetate at 25 and 30°C

Hamidi

Best

2014

Journal of Macromolecular Science, Part B

View full text Add to dashboard Cite

The flow times of ethyl acetate (EA) and poly (3,5-dimethylphenylacrylate) (35PDMPA) in EA were measured using a Cannon-Ubbelohde semi-micro-dilution capillary viscometer in a thermostated water bath at 25 and 30 • C ± 0.02 • C. The intrinsic viscosities [η] of 35PDMPA/EA solutions were evaluated by classical Huggins, and Kraemer's methods. The values of Huggins' constant were related to the polymer-solvent interactions and the nature of the polymer solution. The intrinsic viscosity-molecular weight relationship was established with the two-parameter classical methods of Staudinger-Mark-Houwink-Sakurada and Stockmayer-Fixman. The conformational parameter C ∞ and the rigidity factor σ indicated 35PDMPA was semiflexible. Also, the values of [η] andM w of 35PDMPA samples in EA fit well into the Yamakawa-Fujii worm-like touched-bead model of stiff chains theory modified by Bohdanecký. Comparing the molecular parameters of 35PDMPA in EA with that of 35PDMPA in toluene at the same temperature showed that this polymer was more flexible in EA.

show abstract

Intrinsic viscosities and unperturbed dimensions of long chain molecules

Cited by 722 publications

References 340 publications

Molecular diffusion in polymer solutions

Molecular diffusion in polymer solutions

Synthesis and solution property of acrylamide-sulfobetaine copolymers

Characteristics of Poly(3,5-Dimethylphenylacrylate) in Ethyl Acetate at 25 and 30°C

Contact Info

Product

Resources

About