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  • 701.
    Zajaczkowska, Ursula
    et al.
    Warsaw University of Life Sciences.
    Lundqvist, Sven-Olof
    RISE., Innventia.
    Bujalski, Mateusz
    Warsaw University of Life Sciences.
    Reaction wood formation during stem gravitropic response of young Picea Abies (L.) Karst. trees2016Bok (Fagfellevurdert)
  • 702. Zander, A
    et al.
    Hidemark, O
    Thörnqvist, Thomas
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Institutionen för teknik och design.
    Trä som byggnadsmaterial: -tekniska anvisningar2007Rapport (Annet vitenskapelig)
  • 703.
    Zheng, Chao
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Träkemi och massateknologi.
    Cellulose-fiber-based thermal insulation materials with fungal resistance, improved water resistance and reaction-to-fire properties2017Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Thermal insulation materials made from natural fibrous materials, such as cellulose fibers, have advantages over others from a sustainability point of view. However, cellulosic materials are generally prone to mold and absorb moisture, and these have negative effects on the insulation properties, the durability of insulation materials, and interior air quality. In this thesis, cellulose-fiber-based insulation foams were prepared from bleached chemithermomechanical softwood pulp, and these foams showed promising thermal insulation properties and fungal resistance. Hydrophobic extractives were isolated from birch (Betula verrucosa) outer bark and used to improve the water resistance of the foams, which were impregnated in solutions of extractives and then dried. The modified foams showed greater water resistance, and the modification had no negative effects on the thermal insulation, fungal resistance, and compressive strength of the foams.

    Another potential problem with low density cellulosic thermal insulation materials is their poor reaction-to-fire properties. Cellulose-fiber-based insulation foams were prepared from formulations containing bleached chemithermomechanical softwood pulp and commercial fire retardants to improve the reaction of the foams to fire. Single-flame source test results showed that the foams containing 20% expandable graphite (20% EG) or 25% synergetic (25% SY) fire retardant had significantly improved reaction-to-fire properties and passed class E, which reflected that they can resist a small flame attack without substantial flame spreading for a short period according to EN 13501-1. Compared with the reference without any fire retardant, the peak heat release rate (Peak-HRR) of the 20% EG and 25% SY decreased by 62% and 39% respectively when the samples were subjected to a radiance heat flow of 25 kW m-2 in a Cone Calorimeter.

    The thesis demonstrates that it is possible to produce cellulose-fiber-based insulation materials with improved properties in terms of fungal, improved water resistance and reaction-to-fire properties.

    Fulltekst tilgjengelig fra 2018-05-03 09:39
  • 704.
    Zheng, Chao
    et al.
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Träkemi och massateknologi.
    Li, Dongfang
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Träkemi och massateknologi.
    Ek, Monica
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Träkemi och massateknologi.
    Cellulose-fiber-based insulation materials with improved reaction-to-fire properties2017Inngår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 32, nr 3, s. 466-472Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The poor reaction-to-fire properties of cellulosic thermal insulation need to be improved to meet the safety regulations for building materials. In this study, cellulose-fiber-based insulation foams were prepared from formulations containing mechanical pulp and commercial fire retardants. Results of single-flame source tests showed that foams developed from the formulations with 20% expandable graphite (EG) or 25% synergetic (SY) fire retardants had substantially improved reaction-to-fire properties, and passed fire class E according to EN 13501-1. The results indicated that the foams could resist a small flame attack without serious flame spreading over a short period of time. Compared with the reference foam that contained no fire retardant, the peak heat release rate of the 20% EG and 25% SY foams decreased by 62% and 39% respectively when the samples were subjected to a radiance heat flux of 25 kW m-2 in a cone calorimeter, which suggested enhanced reaction-to-fire properties of these foams.

  • 705.
    Zheng, Chao
    et al.
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Träkemi och massateknologi.
    Li, Dongfang
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Träkemi och massateknologi.
    Ek, Monica
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Träkemi och massateknologi.
    Cellulose-fiber-based insulation materials with improved reaction-to-fire propertiesManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    The poor reaction-to-fire properties of cellulosic thermal insulation need to be improved to meet the safety regulations for building materials. In this study, cellulose-fiber-based insulation foams were prepared from formulations containing mechanical pulp and commercial fire retardants. Results of single-flame source tests showed that foams developed from the formulations with 20% expandable graphite (EG) or 25% synergetic (SY) fire retardants had substantially improved reaction-to-fire properties, and passed fire class E according to EN 13501-1. The results indicated that the foams could resist a small flame attack without serious flame spreading over a short period of time. Compared with the reference foam that contained no fire retardant, the peak heat release rate (Peak-HRR) of the 20% EG and 25% SY foams decreased by 62% and 39% respectively when the samples were subjected to a radiance heat flow of 25 kW m-2 in a Cone Calorimeter, which suggested enhanced reaction-to-fire properties of these foams.

  • 706.
    Zheng, Chao
    et al.
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Träkemi och massateknologi.
    Li, Dongfang
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Träkemi och massateknologi.
    Ottenhall, Anna
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Träkemi och massateknologi.
    Ek, Monica
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Träkemi och massateknologi.
    Cellulose fiber based fungal and water resistant insulation materials2017Inngår i: International Journal of the Biology, Chemistry, Physics, and Technology of Wood, E-ISSN 1437-434XArtikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The development of thermal insulation materials from sustainable, natural fibrous materials is desirable.In the present study, cellulose fiber based insulation foams made of bleached chemi thermo mechanical pulp(CTMP) have been investigated. To improve water resistance, the foams were impregnated with hydrophobic extractives from the outer bark of birch (Betula verrucosa)and dried. The surface morphology of the foams and the distribution of the deposited particles from the extractives were observed by scanning electron microscopy (SEM).The modified foams showed improved water resistance, as they did not disintegrate after immersion in water for7 days, whereas the unmodified foam did. Compared to the unmodified foam, the modified foams absorbed 50%less moisture within 24 h. The modification had no negative effects on the thermal insulation properties, fungal resistance or compressive strength of the foams. The proposed approach is simple and can be easily integrated into plants working based on the biorefinery concept.

  • 707. Ziaei Tabari, Hassan
    et al.
    Nourbakhsh, Amir
    Hosseinpourpia, Reza
    Danesh, Mohammad Amin
    Evaluation of mechanical and morphological behavior of polypropylene/wood fiber nanocomposite prepared by melts compounding2010Inngår i: International Conference on Nanotechnology and Biosensors, 28th to 30th December 2010, Hong Kong, Singapore, 2010, Vol. 2, s. 20-23Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Weak flexural properties of wood plastic composites(WPCs) limit their structural application. Recentlyinvestigation of nano particles looks promising to enhancebending properties of WPCs. In this study, the authors haveinvestigated the effect of different concentrations of nanoclay(modified montmorillonite) and coupling agent on themechanical and micro-structural properties of polypropylene/wood-fiber composites. We Bath internal mixer in certainprocessing conditions used for making the samples and then allsamples molded using injection molding for making samplesfor performing mechanical measurements. Samples preparedin four different concentration of nanoclay 0, 1, 3 and 5 wt%(total weight) and two different concentrations of maleicanhydride grafting (MAPP) 5 and 10 wt%. Mechanical resultsindicate that both flexural and impact strength of thecomposites increasing in sample containing 3% nano clay. Inother trend, Scanning Electron Microscope (SEM) imagesshow better interaction of wood fibers and polymer matrixwhen the authors added 5 wt% MAPP as coupling agent.

  • 708.
    Östman, Birgit
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggteknik (BY).
    Europeisk brandklassning av CLT och LVL2017Inngår i: Bygg & teknik, ISSN 0281-658X, Vol. 109, nr 6, s. 55-57Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [sv]

    Den europeiska brandklassningen av träbaserade produkter har nyligen utvidgats till att gälla även de två relativt nya träprodukterna CLT och LVL. Den täcker därmed praktiskt taget alla byggtillämpningar med träbaserade produkter. Brandklasserna har fastlagts genom ett system för förenklad europeisk brandklassificering för produkter som har ”känt och stabilt beteende vid brand”. Träprodukter är ett utmärkt exempel på sådana produkter. Brandklasserna avser både det europeiska systemet med så kallade Euroklasser A1-F och klasser för brandskyddande förmåga, så kallade K-klasser, se faktaruta.

  • 709.
    Östman, Birgit
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggteknik (BY).
    Fire safety in modern wooden houses: mapping of fire incidents in Sweden2017Inngår i: International fire protection, ISSN 1468-3873, nr 71, s. 46-48Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    Multi-storey timber frame houses have been built in Sweden since 1994, when performance-based building regulations were introduced. The construction technology is now well established and steadily growing. Life safety protection is clearly defined in the building regulations. Now, property protection is being discussed from new perspectives.

    As a first step in better understanding, fire incidents have been mapped. The survey shows that modern apartment buildings with wooden frames have a lower rate of fire incidents than the entire stock of apartment buildings.

  • 710.
    Öyaas, K.
    et al.
    RISE., Innventia, PFI – Paper and Fiber Research Institute.
    Johnsen, I.A.
    Hoff, B.H.
    Opedal, M.T.
    Toven, K.
    RISE., Innventia, PFI – Paper and Fiber Research Institute.
    Gulbrandsen, T.Aa.
    Hot water extraction of hemicellulose from softwood and sugarcane bagasse using microwave heating technology2012Konferansepaper (Fagfellevurdert)
12131415 701 - 710 of 710
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