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  • 1
    Electronic Resource
    Electronic Resource
    Influence of drawing and heat treatment on surface free energies of polyethylene terephthalate fibers (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 628-633 
    Details
    ISSN: 1435-1536
    Keywords: Surface free energy ; polyethyleneterephthalate ; drawing ; heat treatment ; contact angle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The surface free energies of polyethylene terepthalate fibers with different draw ratios were experimentally determined by contact angle measurements inn-alkane/water systems. The dispersive component of the surface free energy increased with increasing draw ratio, whereas the nondispersive one remained almost constant. After heat treatment, the dispersive surface free energy increased, but was reduced above 140°C. The nondispersive component increased by heat treatment at 190°C. The increases in the density and birefringence of the fibres due to the drawing and heat treatment suggested that the increase in the dispersive surface free energy was caused by the increase in the atomic density at the fiber surface due to drawing and heat treatment. ESCA results indicated that the increment in the nondispersive surface free energy due to heat treatment was caused by the addition of functional groups to the fiber surface due to heat treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653059
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of highly concentrated emulsions in water/sucrose dodecanoate oil systems (1997)
    Springer
    Colloid & polymer science 105 (1997), S. 239-243 
    Details
    ISSN: 1435-1536
    Keywords: Highly concentrated emulsions ; HLB ; sucrose dodecanoate ; microemulsions ; phase behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Conditions to produce highly concentrated emulsions or gel emulsions were investigated in water/sucrose dodecanoate/oil systems. HLB (Hydrophile-Lipophile Balance) of sucrose dodecanoate is changed by increasing the number of dodecane carboxylic groups attached to the sucrose ring. In order to know the correlation between the phase behavior and the formation of highly concentrated emulsions, the phase diagram of the water/mixed sucrose dodecanoate/decane system was constructed. In the sucrose monododecanoate system, the surfactant is mainly dissolved in water and forms micelles. With the increase in lipophilic chains, the sucrose surfactant tends to form reverse micelles in oil via microemulsions and lamellar liquid crystal. The formation of O/W-type and W/O-type highly concentrated emulsions is related to this phase behavior. The formation of W/O-type emulsions is enhanced upon addition of monolaurin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01188957
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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