Search for dissertations about: "colour stability"

Showing result 1 - 5 of 19 swedish dissertations containing the words colour stability.

  1. 1. Reactions in the System Nitro-cellulose/ Diphenylamine with Special Reference to the Formation of a Stabilizing Product Bonded to Nitro-cellulose

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Torbjörn Lindblom; Uppsala universitet.; [2004]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Analytical chemistry; Nitro-cellulose; NC; Propellant; Stabilizer; Diphenylamine; DPA; Stability; Shelf-life; Chemometry; FTIR; HPLC; Microcalorimetry; Analytisk kemi; NATURAL SCIENCES Chemistry Analytical chemistry; NATURVETENSKAP Kemi Analytisk kemi;

    Abstract : The methods HPLC, microcalorimetry and FTIR together with chemometry, provide good analytical tools to follow the degradation of nitro-cellulose.The degradation products formed from diphenylamine (DPA) during storage can be followed with HPLC. FTIR, together with chemometry, also gives the precision needed for safety control of propellants. READ MORE

  2. 2. Wood colour related to kiln drying

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Bror Sundqvist; Luleå tekniska universitet.; [2000]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wood Physics; Träfysik;

    Abstract : Raised temperature in artificial drying has led to some changes of wood products such as colour and strength etc. For special treatment of wood-products with clearly modified properties, among them colour, is often high temperature and steam used industrially. READ MORE

  3. 3. Heat treatment of solid wood effects on absorption, strength and colour

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Dennis Johansson; Luleå tekniska universitet.; [2008]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Träfysik; Wood Physics;

    Abstract : Wood is a useful construction material, but it has less desirable properties such as poor durability and poor dimensional stability. These problems can be reduced by using various chemical treatments. Increased environmental awareness has raised the demand for more environmentally friendly methods. READ MORE

  4. 4. Colour changes and acid formation in wood during heating

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Bror Sundqvist; [2004]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wood Physics; Träfysik;

    Abstract : Heating wood has since ancient times been a method to dry and modify its properties. Nowadays heat is used in industrial processes for the same reasons. Treatment at temperatures above 150ºC can change the colour, improve resistance to biodegradation and enhance dimensional stability. READ MORE

  5. 5. Strength and colour response of solid wood to heat treatment

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Dennis Johansson; [2005]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wood Physics; Träfysik;

    Abstract : Heat treatment is a method for improving the durability and dimensional stability of wood. The treatment method used in this work is called Thermo Wood and is industrially applied in Finland. In 2004 production was 31146 m3. The method involves heating wood in a steam atmosphere where the heat causes chemical changes in the structure of the wood. READ MORE