scholarly journals STRUCTURE, MOLECULAR ORIENTATION AND MECHANICALLY INDUCED REORIENTATION OF MOLECULES IN MULTIMOLECULAR FILMS OF LONG-CHAIN N-HYDROCARBON DERIVATIVES

1959 ◽  
Author(s):  
C Sutula ◽  
L Bartell
Keyword(s):  
Molecular Orientation ◽  
Long Chain

scholarly journals Orientation in films of long-chain esters

1937 ◽  
Vol 161 (904) ◽  
pp. 115-127 ◽  
Keyword(s):  
Palmitic Acid ◽  
Molecular Orientation ◽  
Alkyl Chain ◽  
Alkaline Solutions ◽  
Rate Of Hydrolysis ◽  
Long Chain

Monolayers of long-chain fats and esters present some interesting features in molecular orientation, particularly as regards the effect of this orientation on the rate of hydrolysis when spread on alkaline solutions. The dibasic and tribasic long-chain esters (e.g. glycol dipalmitate and tripalmitin) orientate themselves in the interface, with their chains adjacent to one another. The monobasic esters of palmitic acid, however, as Adam (1929) has shown, behave somewhat differently, in that the alkyl chain, if shorter than five carbon atoms and lying extended on the surface in the expanded state, can on compression be forced under the surface into a vertically orientated position opposing the long acidic chain.

THE VISCOSITY – MOLECULAR WEIGHT RELATION FOR POLY-levo-2,3-BUTANEDIYL o-PHTHALATE

1948 ◽  
Vol 26b (12) ◽  
pp. 783-797
Author(s):  
R. W. Watson ◽  
N. H. Grace
Keyword(s):  
Molecular Weight ◽  
High Purity ◽  
Molecular Orientation ◽  
Degree Of Polymerization ◽  
Solution Viscosity ◽  
Dilute Solution ◽  
Molecular Weights ◽  
Complex Relation ◽  
End Group ◽  
Long Chain

The inherent viscosities of dilute solutions of acidic polyesters of high purity have been compared with number average molecular weights accurately determined by end-group titration. For unfractionated resins with a degree of polymerization from 2 to 11 [Formula: see text] the viscosity – molecular weight relation is linear in chloroform at 25 °C. Where [Formula: see text], K = 1.923 × 10−5 and β = 0.0176. For fractionated polyesters from DP 5 to 8, K = 1.959 × 10−6 and β = 0.0161. For unfractionated resins with a DP > 11, molecular weights increase more rapidly than inherent viscosities. Above [Formula: see text] for fractionated resins linearity is resumed, and the slope increases. Several attempts have been made to explain this complex relation. Apparently the short chains remain linear, and the formation of anisotropic fibers at a DP close to 100 establishes a degree of molecular orientation in the long-chain superpolyesters. Isomerization of levo-diol to the diastereoisomer during polycondensation is without effect on the dilute solution viscosity of the resulting resin. Preferential degradation of the longer chains is assumed to be partially responsible for the decreasing slope from DP 11 to 65. As yet it has not been possible to assess the roles played by changes in size distribution, and variation in solvation with increasing chain length, but the data point to a curved viscosity – molecular weight relation in chloroform at 25 °C.

Molecular orientation in physical-vapour deposition of long-chain stearic acid

1984 ◽  
Vol 69 (2-3) ◽  
pp. 231-240 ◽  
Author(s):  
F. Matsuzaki ◽  
K. Inaoka ◽  
M. Okada ◽  
K. Sato
Keyword(s):  
Stearic Acid ◽  
Molecular Orientation ◽  
Vapour Deposition ◽  
Physical Vapour Deposition ◽  
Long Chain

Growth mechanism of long chain compounds from the vapor phase with lateral molecular orientation

1992 ◽  
Vol 118 (3-4) ◽  
pp. 348-352 ◽  
Author(s):  
Kiyoshi Yase ◽  
Mikihiro Yamanaka ◽  
Takashi Sasaki ◽  
Kimio Inaoka ◽  
Masakazu Okada
Keyword(s):  
Vapor Phase ◽  
Growth Mechanism ◽  
Molecular Orientation ◽  
Chain Compounds ◽  
Long Chain

Molecular Orientation Changes in Thin Solid Films of Long-Chain Compounds Induced by Thermal Treatment

1992 ◽  
Vol 31 (Part 2, No. 11B) ◽  
pp. L1632-L1635 ◽  
Author(s):  
Mikihiro Yamanaka ◽  
Kiyotaka Sato ◽  
Kimio Inaoka ◽  
Kiyoshi Yase
Keyword(s):  
Thermal Treatment ◽  
Molecular Orientation ◽  
Thin Solid Films ◽  
Solid Films ◽  
Chain Compounds ◽  
Long Chain
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