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  • 1
    Electronic Resource
    Electronic Resource
    Certain unusual habits oftrans-1,4-polyisoprene single crystals (1987)
    Springer
    Journal of materials science 6 (1987), S. 305-307 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01729335
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  • 2
    Electronic Resource
    Electronic Resource
    Multiple melting due to secondary crystallization in polymers (1992)
    Springer
    Journal of materials science 11 (1992), S. 1692-1695 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00736211
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  • 3
    Electronic Resource
    Electronic Resource
    Morphology of solution crystallized trans-1,4-polyisoprene (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 592-596 
    Details
    ISSN: 1435-1536
    Keywords: Morphology ; crystallization ; singlecrystal ; trans-1 ; 4-polyisoprene
    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 film formation method has been successfully used to grow single crystals and other complex morphological features of low melting form (LMF) and high melting form (HMF) of trans-1,4-polyisoprene (TPIP). Below 40 °C dilute amyl acetate solution gave hexagonal shaped LMF crystals. Thick and elongated hexagonal shaped morphology was shown by HMF crystals at temperatures above 40 °C. Straight faces and sharp corners of the single crystals, and also of complex crystals, acquired round shapes when highly polydispersed TPIP was used for crystallization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412774
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  • 4
    Electronic Resource
    Electronic Resource
    Application of self seeding technique in regulating polymorphic transformations during non-isothermal bulk crystallization of polymers (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 416-421 
    Details
    ISSN: 1435-1536
    Keywords: Crystallization ; polymorphic transformations ; self-seeded crystallization ; thermal analysis ; trans-1,4-polyisoprene
    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 Non-isothermal melt crystallization of trans-1,4-polyisoprene (TPIP) has been studied with the help of differential scanning calorimetry (DSC) and wide-angle x-ray diffraction. Self-seeding has been used for the controlled growth of polymorphs. Thus, self-seeding below 55° and below 71°C has led to the exclusive crystallization of β and α polymorphs, respectively, upon non-isothermal cooling of the polymer melt. These temperatures may vary slightly with the previous thermal history and molecular characteristics of the original sample. It has been interpreted that during cooling the rate of growth (by secondary nucleation) of seeds of either polymorph remains much faster than the rate of primary nucleation of the other polymorph whose seeds are not present in the melt. As a result, the crystallizing melt becomes occupied by the spherulites of the seeded polymorph well before the other polymorph can nucleate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659453
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  • 5
    Electronic Resource
    Electronic Resource
    Shear stability studies on polymer-polymer and polymer-fibre mixtures (1987)
    Springer
    Rheologica acta 26 (1987), S. 31-39 
    Details
    ISSN: 1435-1528
    Keywords: Turbulent drag reduction ; shear stability ; polymer-polymer mixture ; polymer-fibre mixture ; decay coefficient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The shear stability of drag reducing polymer-polymer and polymer-fibre mixtures has been studied at a Reynolds number of 14,000 using a turbulent flow rheometer. The ratio of the drag reduction at a particular pass number to the initial drag reduction has been determined for the mixtures at various pass numbers and compositions in order to determine the effect of composition on the shear stability of the mixtures. It has been found in both cases that when there is a drastic difference in the shear stabilities of the constituents of the mixtures, the incorporation of a small amount of the less shear stable drag reducing agent reduces the shear stability drastically. On the other hand, when the shear stability of the constituents are of the same order, there is only a proportional change in the shear stability of the mixtures on addition of one component to the other. A correlation between the decay coefficient of the mixture (R M ), the decay coefficients of the constituents (R 1 andR 2 ) and the weight fractions of the mixture components (W 1 andW 2) is suggested. An efficacious method for preparing asbestos fibre stock suspensions is also described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332681
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  • 6
    Electronic Resource
    Electronic Resource
    On the lateral habits of polymer single crystals (1994)
    Springer
    Journal of materials science 29 (1994), S. 3749-3753 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Single crystals of trans-1, 4-polyisoprene (TPIP) have been grown from dilute solutions in amyl acetate, n-heptane and n-butanol/n-heptane mixtures. Two samples of different molecular weights, and molecular-weight distribution have been used to demonstrate the effect of these molecular parameters on the shape of single crystals. The experiments suggested that crystallization of narrowly distributed polymer chains, irrespective of the molecular weight of the crystallizing species, will produce a hexagonal morphology. This narrow distribution of chains during crystallization can be achieved by starting with a sample of low polydispersity or using a solvent/non-solvent mixture for crystallization. If the chain-size distribution is not controlled, then at later stages of growth the heterogeneous mixture of chains will create a curvature on the {110} faces and produce oval-shaped lamellar platelets. Further, the crystal habits in the present work were found to be related to the solvent, molecular weight and molecular-weight distribution, rather than to the crystallization temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00357344
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  • 7
    Electronic Resource
    Electronic Resource
    Drag reduction by polymer-polymer mixtures (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 837-858 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: An extensive study on the turbulent drag reduction caused by the various mixtures of polyacrylamide, purified guargum, xanthangum, and their graft copolymers has been conducted at low concentrations and Re = 14,000 using a turbulent flow rheometer. It has been found in most of the cases that the drag reduction caused by mixtures shows a positive deviation from the linearly additive straight line. This effect is more prominent when the drag reduction caused by both the constituents differ appreciably. In most of the cases, the drag reduction caused by the mixtures is higher than the DR caused by either of the constituent polymers; however, the drag reduction caused by the mixture is less than the sum of the drag reduction caused by both the constituents at their respective concentration in the mixture. It has also been noticed that there is no evidence of synergism in these mixtures at low concentrations.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070360409
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  • 8
    Electronic Resource
    Electronic Resource
    The turbulent drag reduction by graft copolymers of guargum and polyacrylamide (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 4013-4018 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Commercial guargum is known to be a shear stable drag reducing agent. However, the aqueous solutions of guargum start degrading within 8 hrs. of their preparation and after 65 hrs., they degrade completely. In the present investigation, the graft copolymers of guargum and polyacrylamide have been prepared. It has been shown that the purification and grafting enhance the drag reduction effectiveness and biodegradation resistance considerably in guargum.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070301005
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  • 9
    Electronic Resource
    Electronic Resource
    Dilute-solution properties of trans-1,4-polyisoprene (1985)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 23 (1985), S. 1255-1262 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Trans-1,4-polyisoprene was fractionated by both fractional precipitation and preparative gel permeation chromatography to obtain possibly sharp fractions of narrow molecular weight distribution. Selected fractions were characterized by light scattering, viscosity, and gel permeation chromatography. Necessary corrections for molecular heterogeneity were applied. Some of the characteristic relations between [η] and Mw are [η] = 1.81 × 10-4 Mw0.722 in benzene at 30°C, [η] = 1.38 × 10-4 Mw0.711 in n-hexane at 30°C, which are found to be in good agreement with literature data when corrected for molecular heterogeneity.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1985.180230616
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  • 10
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    On the lateral habits of polymer single crystals (1994)
    Springer
    Details
    Publication Date: 1994-07-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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