| 1. |
- Ander, Paul
(författare)
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Surface modified cellulose obtained by acetylation without solvents of bleached and unbleached kraft pulps
- 2011
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Ingår i: Polimery -- Tworzywa Wielkocza¿¿¿¿steczkowe. - 0032-2725. ; 56, s. 834-840
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Tidskriftsartikel (refereegranskat)abstract
- Heterogeneous acetylation to a low extent of bleached and unbleached commercial kraft pulps was performed with acetic anhydride without solvents and in the presence of sulfuric acid catalyst. The process was conducted in an effort to change the polarity of studied kraft pulps and to improve their compatibility with synthetic polymers without changing their fibrous structure. It was observed that the fiber morphology does not change up to a reaction time of 3 h for both investigated materials. The hydrophilic character of the bleached pulp was decreased by acetylation to a low extent, while the unbleached material showed an initial increase of water retention capacity. At higher degrees of modification, both pulps exhibited similar hydrophilic properties. For both materials, an initial slightly increased susceptibility to enzymatic attack with cellulase from Trichoderma reesei was observed, however the acetylated bleached cellulose fibers were more susceptible to enzymatic attack than those of the unbleached material.
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| 2. |
- Andrzejewska, E, et al.
(författare)
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Anomalous polymerization of multifunctional monomers
- 1998
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Ingår i: POLIMERY. - : LUKASIEWICZ Research Network - Industrial Chemistry Research Institute. - 0032-2725. ; 43:7-8, s. 427-436
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 3. |
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| 4. |
- Edlund, Ulrica, et al.
(författare)
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A controlled radical polymerization route to polyepoxidated grafted hemicellulose materials
- 2014
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Ingår i: Polimery. - : LUKASIEWICZ Research Network - Industrial Chemistry Research Institute. - 0032-2725. ; 59:1, s. 60-65
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Tidskriftsartikel (refereegranskat)abstract
- Polyfunctional copolymers were prepared from the major softwood hemicellulose polysaccharide, i.e. O-acetylated galactoglucomannan (AcGGM) through a grafting-from controlled radical polymerization. AcGGM was functionalized with brominated pendant groups that served as initiating species in the subsequent Cu(0) mediated radical polymerization of glycidyl methacrylate (GMA). A linear relationship of ln[GMA](0)/[GMA] (the index 0 refers to the initial value) versus reaction time up to conversions of 80 % suggests a first order rate of propagation and a "living" polymerization.
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| 8. |
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| 9. |
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| 10. |
- Kittikorn, Thorsak, et al.
(författare)
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Influence of sisal fibre modification on the microbial stability of poly(hydroxybutyrate-co-valerate) : thermal analysis
- 2022
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Ingår i: Polimery. - : INDUSTRIAL CHEMISTRY RESEARCH INST. - 0032-2725. ; 67:3, s. 93-101
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Tidskriftsartikel (refereegranskat)abstract
- The effect of modification of sisal fibre with propionic anhydride and vinyltrimethoxy silane on the microbiological stability of poly(hydroxybutyrate-co-valerate) (PHBV) was investigated. The effect of the coupling agent - PHBV grafted with maleic anhydride (PHBV-g-MA) was also investigated. The best adhesion at the interface was observed for propionylation of sisal fibre, which improved the thermal properties of the composites. Composites with modified sisal fibre were characterized by higher activation energy (155 kJ/mol), which is related to stronger interactions at the matrix-fibre interface. In the microbial growth test, all biocomposites showed a decrease in molecular weight due to enzymatic degradation by Aspergillus niger. The most resistant to microorganisms was the composite containing propionylated sisal fibre. DMTA and TGA also confirmed the highest microbiological stability of the composite with the addition of propionylated sisal fibre, as evidenced by the smallest change in the properties after the microbiological growth test. In contrast, PHBV-g-MA caused significant enzymatic degradation due to the presence of large amorphous regions.
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| 13. |
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| 14. |
- Redmer, P, et al.
(författare)
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Photochemical preparation of polymer-clay composites
- 2002
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Ingår i: POLIMERY. - : LUKASIEWICZ Research Network - Industrial Chemistry Research Institute. - 0032-2725. ; 47:2, s. 136-138
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 15. |
- Åkesson, Dan, et al.
(författare)
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Products obtained from decomposition of glass fiber-reinforced composites using microwave pyrolysis
- 2013
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Ingår i: Polimery. - : Industrial Chemistry Research Institute. - 0032-2725. ; 58:7-8, s. 582-586
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Tidskriftsartikel (refereegranskat)abstract
- The possibility to obtain useful products from used glass fiber-reinforced composites using microwave pyrolysis were examined. A scrap of blade from a wind turbine was fragmented and microwave-pyrolysed. The oil and gas formed during the pyrolysis were characterized by gas chromatography-mass spectrometry (GC-MS). The oil from pyrolysis consisted mainly of various aromatic compounds and had an energy content of about 36 MJ/kg. The main component of the gaseous products was methane. The glass fiber recovered after pyrolysis represented 70 % of the initial mass of glass fiber-reinforced plastic.
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