Search for dissertations about: "vapour permeability"

Showing result 1 - 5 of 17 swedish dissertations containing the words vapour permeability.

2. 1. Alternative methods for analysing moisture transport in buildings : Utilisation of tracer gas and natural stable isotopes

   Author : Kjartan Gudmundsson; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; tracer gas; water vapour permeability; diffusion; surface diffusion; isotopic analysis; deuterium; oxygen-18; fractionation; vapour barrier; transient numerical modelling of diffusion; Building engineering; Byggnadsteknik;

   Abstract : New methods, based on tracer gas measurements and isotopicanalysis can be used to evaluate the moisture properties ofbuilding materials and provide the means for forensic analysisof the origins and history of excessive water in buildings, theimmediate practical consequences of which will be the abilityto improve the moisture performance of constructions. It is shown, in theory and through measurements how thewater vapour permeability of porous building materials can witha good degree of accuracy be estimated with tracer gasmeasurements that provide an efficient alternative to the cupmethod. READ MORE

4. 2. Material Properties of Cereal Protein Films

   Author : Thomas Gillgren; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; plasticization; avenin; prolamin; kafirin; mechanical properties; water vapour permeability; oxygen permeability; protein; film; glass transition temperature; zein;

   Abstract : Materials that are renewable and biodegradable are demanded due to environmental aspects. Biopolymeric materials, such as materials from prolamins, fulfil both of these requirements. Prolamins are cereal storage proteins. Examples of such are zein, gluten, kafirin and avenin from maize, wheat, sorghum and oats, respectively. READ MORE

5. 3. Material Properties of Starch and Cereal Protein Films and Foams

   Author : Thomas Gillgren; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; foam; avenin; oxygen permeability; amylopectin; water vapour permeability; plasticization; mechanical properties; zein; film; glass transition temperature; kafirin; prolamin; cereal protein; amylose; starch;

   Abstract : Materials that are renewable and biodegradable are demanded for environmental reasons. Biopolymeric materials, such as materials from starch and cereal proteins, are both renewable and biodegradable. However, starch and cereal protein materials are generally rather brittle and therefore need to be plasticized to become more flexible. READ MORE

6. 4. Properties of chitosan and whey protein films blended with poly(e-caprolactone)

   Author : Idoia Olabarrieta; KTH; []
   Keywords : Biodegradable polymers; Edible polymers; Chitosan; Whey protein; Poly e-caprolactone ; Food packaging; Oxygen permeability; Water vapour permeability; Physical properties; Optical properties; Mechanical properties;

   Abstract : .... READ MORE

7. 5. Strategies to improve the aging, barrier and mechanical properties of chitosan, whey and wheat gluten protein films

   Author : Idoia Olabarrieta; Mikael Hedenqvist; Jose Maria Lagaron; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chemistry; biodegradable polymers; chitosan; whey protein; wheat gluten; poly ε-caprolactone ; montmorillonite; food packaging; permeability; mechanical properties; aging; pH; solubility; migration; solution casting.; Kemi; Chemistry; Kemi;

   Abstract : Chitosan, Whey Protein Isolate (WPI) and vital wheat gluten (WG) are three biomaterials that have quite promising properties for packaging purposes. They have good film forming properties and good gas barrier properties in dry conditions. READ MORE