Sökning: "Dynamic-mechanical analysis"
Visar resultat 1 - 5 av 39 avhandlingar innehållade orden Dynamic-mechanical analysis.
1. Volumetric Analysis in Mechanical Behaviour and Physical Ageing of Polymers
Sammanfattning : Volumetric changes associated with the deformation of ideal elastic solids depends on elastic constants of the solid and applied strain. Their magnitude is easily determined from the corresponding Poisson's ratios. LÄS MER
2. Viscoelastic properties and plasticization potential of native, residual, and technical lignin
Sammanfattning : Lignin in biomass, pulp, and isolated during pulping all have great potential as renewable and inexpensive thermoplastic components and materials, but widespread utilization is hindered by high glass transition temperatures (Tg), brittleness, and poor flow properties. The aim of this thesis is to elucidate what molecular structures govern lignin thermoplasticity and how these can be efficiently manipulated. LÄS MER
3. Water diffusion and free volume in hydrophilic polymers
Sammanfattning : During moisture uptake in polymers, the diffusion of the water molecules is believed to occur via unoccupied voids. These voids are called free volume cavities and their sizes are continuously altered when the moisture content in the polymer is enhanced. LÄS MER
4. Macroscopic Volume and Free Volume of Polymer Blends and Pressure-densified Polymers
Sammanfattning : The macroscopic volume V as a function of pressure P and temperature T is obtained from PVT measurements. PVT data is sensitive to the state of polymers and changes therein. Moreover, PVT data gives access to the free-volume fraction. LÄS MER
5. Rheological and mechanical properties of systems containing nanocellulose
Sammanfattning : Nanocellulose is a cellulose entity at the nanoscale. There are several different types of nanocellulose such as cellulose nanofibrils (CNF), which are long, somewhat flexible fibrils and cellulose nanocrystals (CNC), which are shorter and more rod-like particles. LÄS MER