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  • 1.
    Johansson, M
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    Falken, H
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    Irestedt, A
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    Hult, A
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    On the synthesis and characterization of new low temperature curing powder coatings cured with radiation1998In: JCT: Journal of Coatings Technology, ISSN 0361-8773, Vol. 70, p. 57-62Article in journal (Refereed)
    Abstract [en]

    The synthesis and characterization of a new type of low temperature curing powder coating is described. The type of materials used were mixtures of an amorphous methacrylate-functional prepolymer and crystalline acrylate and methacrylate monomers. The introduction of a crystalline component in an amorphous resin mixture was shown to markedly reduce the melt viscosity and thus enhance the flow properties of the powder coating. Curing experiments showed the advantage of using photoinitiation compared to thermal initiation. The reaction was much faster and the problem with oxygen inhibition could be avoided.

  • 2.
    JOHANSSON, M
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    HULT, A
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    SYNTHESIS, CHARACTERIZATION, AND UV CURING OF ACRYLATE FUNCTIONAL HYPERBRANCHED POLYESTER RESINS1995In: JCT: Journal of Coatings Technology, ISSN 0361-8773, Vol. 67, p. 35-39Article in journal (Refereed)
    Abstract [en]

    A series of different hyperbranched aliphatic polyester resins with acrylate functionality have been synthesized, characterized, and UV cured. The terminal groups have been either benzoates, propionates, or hydroxyls. The glass transition (T-g) and viscosity of the resins have been shown to depend on the polarity of the end groups. The increase in viscosity, while the propionate functional resin has the lowest T-g and viscosity. The acrylates are all free radically UV cured with little or no oxygen inhibition found. The residual unsaturation in the cured films is not detectable with Raman spectroscopy, i.e., less than five percent. The cured films are all hard with a T-g difference varying with the structure of terminal groups in the resins.

  • 3. Johansson, Mats
    et al.
    Falken, H
    Irestedt, A
    Hult, Anders
    On the synthesis and characterization of new low temperature curing powder coatings cured with radiation1998In: JCT: Journal of Coatings Technology, ISSN 0361-8773, Vol. 70Article in journal (Refereed)
  • 4. Johansson, Mats
    et al.
    Hult, Anders
    SYNTHESIS, CHARACTERIZATION, AND UV CURING OF ACRYLATE FUNCTIONAL HYPERBRANCHED POLYESTER RESINS1995In: JCT: Journal of Coatings Technology, ISSN 0361-8773, Vol. 67Article in journal (Refereed)
  • 5.
    Johansson, Mats K. G.
    et al.
    KTH, Superseded Departments, Polymer Technology.
    Malmström, Eva E.
    KTH, Superseded Departments, Polymer Technology.
    Jansson, A.
    Hult, Anders
    KTH, Superseded Departments, Polymer Technology.
    Novel concept for low temperature curing powder coatings based on hyperbranched polyesters2000In: JCT: Journal of Coatings Technology, ISSN 0361-8773, Vol. 72, no 906, p. 49-54Article in journal (Refereed)
    Abstract [en]

    The concept of using hyperbranched polymers as scaffolds for solid thermoset resin applications is described. A series of semi-crystalline methyacrylate-functional aliphatic polyesters has been synthesized and characterized for applications as solid thermoset resins, e.g., powder coating resins. The polyester resins have been crosslinked by UV irradiation producing either amorphous or semi-crystalline crosslinked films depending on the initial structure. The resins are based on hyperbranched aliphatic polyester chains have been grafted and end-capped with methacrylate moieties. The resins exhibit a rheological behavior suitable for low temperature curing powder coatings, i.e., films that can be readily formed and UV cured at temperatures below 80 degrees C.

  • 6. Krupicka, A.
    et al.
    Johansson, Mats K. G.
    KTH, Superseded Departments, Polymer Technology.
    Hult, Anders
    KTH, Superseded Departments, Polymer Technology.
    Favaro, G.
    Mechanical surface characterization: A promising procedure to screen organic coatings2003In: JCT: Journal of Coatings Technology, ISSN 0361-8773, Vol. 75, no 939, p. 19-+Article in journal (Refereed)
    Abstract [en]

    Two ductile coating materials were subjected to a combined indentation and scratch test procedure designed to screen a predetermined pattern of many small sample surfaces in a limited time. The screening of 50 surface spots ordered in a matrix pattern on the surface was carried out in 4.5 hr. The test provides reproducible data in terms of indentaion modulus, elastic recovery, scratch penetration depth, and scratch residual depth, and also offers the possibility of detecting critical mechanical transitions such as rupture. The presented procedure produces sufficient data in a limited time scale to fulfill the requirements for a fast method to screen coating compositions.

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