Polymethyl methacrylate: Dilute solution properties by viscosity and light scattering

Wiley - Tập 17 Số 85 - Trang 391-401 - 1955
Suresh N. Chinai1, J. D. Matlack1, Rudolph A. Guzzi1, R. J. Samuels1
1Plastics Research Section, Picatinny Arsenal, Dover, New Jersey

Tóm tắt

AbstractA polymethyl methacrylate polymer, prepared by the emulsion technique, was fractionated three times to obtain essentially homogeneous fractions. The intrinsic viscosities and weight average molecular weights were determined in an ideal solvent at 23°C. and in nonideal solvents at 25°C. The constants K and a in the conventional modified equation [η] = KMa were determined. The intrinsic viscosity in an ideal solvent was found to fit closely over the molecular range studied with the relation [η]θ = KM1/2. Light scattering measurements giving root‐mean‐square distance between ends of a polymer chain were carried out. It was shown that these results support both Kuhn's relation (r̄2)1/2 ≈︁ M0.50 and Flory's relation (r̄2)3/2 = M[η]/2.1 × 1021 in an ideal solvent. In a nonideal solvent only Flory's relation was found to be in agreement with the experimental results. The values of volume expansion factor α3 ratios A2M/(r̄2)3/2 and A2Mw/[η] in a nonideal solvent and the value of the ratio [η]/M1/2 in an ideal solvent showed that the polymer molecules were expanded beyond their random flight dimensions in a nonideal solvent.

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Tài liệu tham khảo

10.1021/ja01642a016

10.1002/pol.1953.120100402

10.1002/pol.1953.120100108

10.1063/1.1698650

10.1063/1.1698634

10.1364/JOSA.40.000768

Brice B. A., 1946, J. Opt. Soc. Am., 36, 363

10.1021/j150451a002

Flory P. J., 1953, Principles of Polymer Chemistry

10.1002/pol.1953.120100406

10.1002/macp.1952.020070306

10.1002/pol.1953.120110103

10.1063/1.1747243

S. N.Chinai P. C.Scherer andD. W.Levi in press.

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Thông tin xuất bản

Wiley

Tập 17 Số 85

391-401

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