Change search
Refine search result
1 - 11 of 11
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1. Albertsson, A-C.
    et al.
    Karlsson, S.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
    New tools for analyzing degradation1995In: Macromolecular Symposia, ISSN 1022-1360, E-ISSN 1521-3900, Vol. 98, no 35th IUPAC International Symposium on Macromolecules, 1995, p. 797-801Article in journal (Refereed)
  • 2.
    Albertsson, Ann-Christine
    et al.
    KTH, Superseded Departments, Polymer Technology.
    Edlund, Ulrica
    KTH, Superseded Departments, Polymer Technology.
    Stridsberg, K.
    Controlled ring-opening polymerization of lactones and lactides2000In: Macromolecular Symposia, ISSN 1022-1360, E-ISSN 1521-3900, Vol. 157, p. 39-46Article in journal (Refereed)
    Abstract [en]

    1,5-dioxepan-2-one (DXO) is presented as a versatile component in biodegradable polymers for biomedical applications. Copolymerization of DXO and L-lactide yielded a semi-crystalline, yet flexible, material where the extent of crystallinity and erosion characteristics were controlled by an appropriate choice of copolymer composition. Crosslinked PDXO was polymerized as a novel biodegradable elastomer. The degradation behavior of these materials were explored in vitro. Microspheres from poly(DXO-co-L-LA) were prepared and shown to be promising candidates for controlled release. The polymer composition and drug solubility provided effective means of controlling the drug delivery pattern.

  • 3.
    Finne Wistrand, Anna
    et al.
    KTH, Superseded Departments, Fibre and Polymer Technology.
    Ryner, M.
    Albertsson, Ann-Christine
    KTH, Superseded Departments, Polymer Technology.
    Degradable polymers: Design, synthesis and testing2003In: Macromolecular Symposia, ISSN 1022-1360, E-ISSN 1521-3900, Vol. 195, p. 241-246Article in journal (Refereed)
    Abstract [en]

    The object for our research is to mimic Nature's perfectly designed resorbable materials to obtain important materials, which are biocompatible and degradable. We have therefore synthesized different architectures and copolymers of aliphatic polyesters with ring-opening polymerization. The first studies of these materials properties show that properties like hydrophilicity and tensile properties can be controlled.

  • 4.
    HULT, A
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    JOHANSSON, M
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    MALMSTROM, E
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
    DENDRITIC RESINS FOR COATING APPLICATIONS1995In: Macromolecular Symposia, ISSN 1022-1360, E-ISSN 1521-3900, Vol. 98, p. 1159-1161Article in journal (Refereed)
    Abstract [en]

    Hyperbranched, aliphatic polyesters of theoretically calculated molar masses 1 200-44 300 (2-7 generations) were synthesized in the molten state from 2,2-bis(hydroxymethyl)propionic acid (bis-MPA) (repeating unit of AB(x)-type) and 2-ethyl-2-(hydroxymethyl)-1,3-propanediol (TMP) (core molecule) using acid catalysis. The synthetic procedure was a pseudo-one-step divergent reaction. The degree of branching was found to be near 80 %. A study has also been made with respect to the theological properties of the hyperbranched aliphatic polyesters. The polymers exhibit an almost newtonian behaviour in the molten state. They also exhibit a lower increase in viscosity with molecular weight than linear polymers. The surface functionality is shown to greatly affect the viscosity of the polymers.

  • 5. Hult, Anders
    et al.
    Johansson, Mats
    Malmström, Eva
    DENDRITIC RESINS FOR COATING APPLICATIONS1995In: Macromolecular Symposia, ISSN 1022-1360, E-ISSN 1521-3900, Vol. 98Article in journal (Refereed)
  • 6.
    Karlsson, S.
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
    Albertsson, A-C.
    Environmental interaction of polymers. Natural metabolites as opposed to the degradation products of synthetic polymers1997In: Macromolecular Symposia, ISSN 1022-1360, E-ISSN 1521-3900, Vol. 118, no 1, p. 733-737Article in journal (Refereed)
  • 7.
    Karlsson, Sigbritt
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
    Albertsson, Ann-Christine
    Abiotic and biotic degradation of aliphatic polyesters from "petro" versus "green" resources1998In: Macromolecular Symposia, ISSN 1022-1360, E-ISSN 1521-3900, Vol. 127, p. 219-225Article in journal (Refereed)
  • 8. Nilsson, Helena
    et al.
    Olsson, Ann
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Lindström, Mikael
    Iversen, Tommy
    Bark Suberin as a Renewable Source of Long-Chain omega-Hydroxyalkanoic Acids2008In: Macromolecular Symposia, ISSN 1022-1360, E-ISSN 1521-3900, Vol. 272, no 1, p. 104-106Article in journal (Refereed)
    Abstract [en]

    Polycondensations of cis-9,10-epoxy-18-hydroxyoctadecanoic acid, isolated from birch outer bark, were performed at 75 degrees C in toluene as solvent and at 85 degrees C in bulk using immobilized Candida antarctica lipase B as catalyst. The polycondensation performed in toluene in presence of molecular sieves gave a polyester with DP 50 after 24 h. The same DP was obtained at much shorter reaction time (3 h) by bulk polymerization in an open vial without any drying agent present.

  • 9. Renstad, Rasmus
    et al.
    Karlsson, Sigbritt
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
    Albertsson, Ann-Christine
    The influence of processing conditions on the properties and the degradation of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)1998In: Macromolecular Symposia, ISSN 1022-1360, E-ISSN 1521-3900, Vol. 127, p. 241-249Article in journal (Refereed)
  • 10. Ryner, M.
    et al.
    Albertsson, Ann-Christine
    KTH, Superseded Departments, Polymer Technology.
    Tailored mechanical properties and degradability of polyesters by controlled molecular architecture2001In: Macromolecular Symposia, ISSN 1022-1360, E-ISSN 1521-3900, Vol. 175, p. 11-18Article in journal (Refereed)
    Abstract [en]

    Advanced molecular architectures have been used as a toot for tailoring the mechanical properties and the degradation process of polymers for specific applications. Crosslinked poly(1,5-dioxepan-2-one), random poly(1,5-dioxepan-2-one-co-L-lactide), triblock poly(L-lactide-b-1,5-dioxepan-2-one-b-L-lactide) and triblock poly(epsilon -caprolactone-b-1,5-dioxepan-2-one-b-epsilon -caprolactone) have been synthesized and their thermal and mechanical properties as well as degradation times and degradation products have been characterized and compared. The stress at break of the synthesized polymers ranged from 4 MPa to 55 MPa and the elongation at break from 25% to 1200%. The degradation time varied from 70 days up to 360 days. These polymers are suitable as films or microspheres for controlled drug delivery or as temporary tissue replacements e.g. for tendons or nerve guides.

  • 11. Vaida, Cristian
    et al.
    Takwa, Mohamad
    KTH, School of Biotechnology (BIO), Biochemistry (closed 20130101).
    Martinelle, Mats
    KTH, School of Biotechnology (BIO), Biochemistry (closed 20130101).
    Hult, Karl
    KTH, School of Biotechnology (BIO), Biochemistry (closed 20130101).
    Keul, Helmut
    Möller, Martin
    gamma-Acyloxy-epsilon-Caprolactones: Synthesis, Ring-Opening Polymerization vs. Rearrangement by Means of Chemical and Enzymatic Catalysis2008In: Macromolecular Symposia, ISSN 1022-1360, E-ISSN 1521-3900, Vol. 272, p. 28-38Article in journal (Refereed)
    Abstract [en]

    gamma-Acyloxy-epsilon-caprolactones (3a-d) were prepared in two steps starting from 4-hydroxy-cyclohexanone (1). in the first step acylation of the hydroxyl group occurs and in the second step ring enlargement by Baeyer-Villiger oxidation. if this order of reaction is inverted rearrangement occurs in the Baeyer-Villiger oxidation Of 4-hydroxy-cyclohexanone leading to gamma-hydroxyethyl-gamma-butyrolactone. Using the first procedure gamma-acetyloxy- (33), gamma-benzoyloxy-(3B), gamma-acryloyloxy-(3c), and gamma-methacryloyloxy-epsilon-caprolactone (3d) were prepared. These monomers and for comparison reasons epsilon-caprolactone and gamma-methyl-epsilon-caprolactone were polymerized by means of chemical and enzymatic catalysis. The results were different depending on the monomer structure and catalyst used. in the presence of a chemical catalyst, all the monomers, except gamma-acetyloxy-epsilon-caprolactone, undergo controlled ring-opening polymerization. gamma-Acetyloxy-epsilon-caprolactone (3a), however, rearranges to a large extent under polymerization conditions to give gamma-acetyloxyethyl-gamma-butyrolactone (6a). in the presence of an enzyme (Novozyme 435, Lipase B from Candida antarctica (CALB) immobilized on a macroporous resin) all gamma-acyloxy-epsilon-caprolactones partly rearrange to result the corresponding gamma-acyloxy-gamma-butyrolactones, while epsilon-caproiactone and gamma-methyl-epsilon-caprolactone yield the corresponding polymers, the latter even in a stereoselective manner as reported earlier in the literature. A molecular dynamic study was performed with 3a and 3b as substrates to gain information on the substrate recognition displayed by CALB. A mechanism for the chemically and enzymatically catalyzed reactions of gamma-acyloxy-epsilon-caprolactones is proposed.

1 - 11 of 11
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf