Light‐scattering by a number of solvents, in conjunction with data on solutions of Ludox, saccharose‐octa‐acetate, and polystyrene

Trap, H. J. L.; Hermans, Jan

doi:10.1002/recl.19540730302

Cited by 17 publications

(1 citation statement)

References 37 publications

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“…Once Hageman factor becomes activated, it converts plasma thromboplastin antecedent (PTA) to an activated form (7,8). In vitro this reaction is accelerated several fold by 1 X 10-5M long chain saturated fatty acids (9).…”

Section: A Number Of Mechanisms Have Been Proposed To Explain the Funmentioning

confidence: 95%

Light Scattering by Liquids at 6937 Angstroms

Lundberg¹,

Mooney²,

Gardner³

1964

Science

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Section: A Number Of Mechanisms Have Been Proposed To Explain the Funmentioning

confidence: 95%

Light Scattering by Liquids at 6937 Angstroms

Lundberg¹,

Mooney²,

Gardner³

1964

Science

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Lichtstreuungsmessungen an oligomeren; lösungsverhalten von polypropylenglykol

Meyerhoff

Moritz

1967

Makromol. Chem.

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ZUSAMMENFASSUNG:Es wird iiber Lichtstreuungsmessungen an Polypropylenglykolen mit Molekulargewichten von M = 400 bis 4000, an monomerem und dimerem Propylenglykol, an Diphenyl, Tristearin und Pentaerythrittetrastearat in Losung berichtet. Die molekulareinheitlichen Substanzen dienten zur Untersuchung der Leistungsfiihigkeit der Lichtstreuungstechnik im Bereich niedriger Molekulargewichte. Fiir den CABANms-Faktor und das Brechungsinkrement wurde eine Abhsngigkeit von Molekulargewicht und Konzentration gefunden.Die Streulichtmessungen an den polymerhomologen Propylenglykolen in Verbindung mit Viskositatsmessungen in Aceton und Benzol wurden zur Charakterisierung des Losungsverhdtena venvendet. Es ergab sich, d& fiir die Propylenglykole der Charakter eines geknsuelten Fadenmolekiils bis zu vie1 niedrigeren Polymerisationsgraden als bei den meisten anderen Polymeren erhalten bleibt. Der zweite Virialkoeffizient steigt von den hoheren Molekulargewichten bis M = 400 schwach an, wird fiir das Dimere anniihernd 0 und fiir das Monomere negativ. Der Viskositatsexponent in [q] = K Ma bleibt beim PPG/Benzolsystem bis zu M w 500 herab groaer ah 0,5. SUMMARY:Light scattering measurements in solution have been carried out on polypropylene glycols in the molecular weight range from M = 400 to M = 4000, on monomer and dimeric propylene glycol and as well on diphenyl, tristearin, and pentaerythritol tetrastearate. The substances of uniform molecular weight were investigated in order to test the applicability of light scattering technique in the low molecular weight range. It was found that CABANNES factor and refractive index increment depend on molecular weight and concentration. Light scattering studies together with viscosity measurements were used in order to characterize the behavior in solution of the polymer homologue polypropylene glycols in benzene and acetone. The result was that the polypropylene glycols preserved the character of a coiled chain molecule to a much lower degree of polymerisation than most of the other known polymers. The second virid coefficient rises slightly from the higher molecular weights to M w 400, approaching zero for the dimer and turning negative for the monomer.The viscosity exponent a in the equation [q] = K Ma remains above 0.5 down to M w 500 in the case of the polypropylene glycol/benzene system.

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A light‐scattering study of low pressure polyethylene fractions

Tung

1959

J. Polym. Sci.

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Low pressure polyethylene fractions of molecular weight above 100,000 have been studied by the light scattering method. The presence of long chain branches in fractions of molecular weight above 300,000 was indicated by the data. The molecular weight‐intrinsic viscosity relationship for linear polyethylene chains was found to be [η] = 4.60 × 10−4 M0.725 when tetralin at 130°C. was used as the solvent for the intrinsic viscosity measurements. This relationship gives molecular weights about 1.15 times higher than those found previously by the number‐average molecular weight determination of the fractions.

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Light‐scattering by a number of solvents, in conjunction with data on solutions of Ludox, saccharose‐octa‐acetate, and polystyrene

Cited by 17 publications

References 37 publications

Light Scattering by Liquids at 6937 Angstroms

Light Scattering by Liquids at 6937 Angstroms

Lichtstreuungsmessungen an oligomeren; lösungsverhalten von polypropylenglykol

A light‐scattering study of low pressure polyethylene fractions

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