Sökning: "crystallinity"

Visar resultat 6 - 10 av 164 avhandlingar innehållade ordet crystallinity.

1. 6. Solid state characterisation and compaction behaviour of pharmaceutical materials

   Författare :Christina Gustafsson; Uppsala universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Pharmacy; Solid-state; Tablet; Thermal analysis; Cellulose; Spectroscopy; NMR; NIR; FT-IR; Crystallinity; MVDA; FARMACI; PHARMACY; FARMACI; farmaceutisk farmakologi; Pharmaceutical Pharmacology;

   Sammanfattning : In this thesis, factors important in tableting operations and for tablet properties have been studied and characterised by different spectroscopic techniques as well as by some more conventionally used particle characterisation techniques. The spectroscopic techniques solid-state NMR, FT-IR and NIR spectroscopy, proved to be valuable tools in the estimation of particle and tablet properties, offering both specificity and sensitivity in the measurements. LÄS MER

3. 7. Ultrastructural Aspects of Pulp Fibers as Studied by Dynamic FT-IR Spectroscopy

   Författare :Margaretha Åkerholm; KTH; []
   Nyckelord :cellulose; cooperation; crystallinity; dynamic test; glucomannan; hardwood; holocellulose; humidity; infrared spectroscopy; kraft pulp; lignin; mechanical pulp; orientation; polarised light; softwood; strain; sulphite pulp; viscoelasticity; xylan;

   Sammanfattning : Dynamic (or 2D) FT-IR spectroscopy in combination withpolarized IR irradiation has been used in this work to studywood polymer orientation and interactions on theultrastructural level in wood fibers in the native state aswell as the effects of different pulping processes. The woodpolymer interactions were studied under both dry and humidconditions. LÄS MER

4. 8. Retrogradation Properties of Starch

   Författare :José Silverio; Livsmedelsteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; surfactants; lipids; degree of polymerization DP ; isothermal microcalorimetry; differential scanning calorimetry DSC ; crystallinity; amylose; amylopectin; gelatinization; starch; retrogradation; temperature cycling; PCA; Food and drink technology; Livsmedelsteknik;

   Sammanfattning : The main purpose of this thesis was to examine various factors influencing starch retrogradation. The reassociation events of starch, which are closely linked to the staling of bakery products, were mainly studied by thermal analysis. Some aspects of starch gelatinization are also included. LÄS MER

5. 9. Polypropylene : Morphology, defects and electrical breakdown

   Författare :Sari J. Laihonen; Ulf W. Gedde; Erling Ildsten; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical engineering; polypropylene; poly propylene-stat-ethylene ; crystal structure; morphology; crystallinity; crystallization kinetics; lamellae; spherulite; defect; Kemiteknik; Chemical engineering; Kemiteknik;

   Sammanfattning : Crystal structure, morphology and crystallization kinetics of melt-crystallized polypropylene and poly(propylene-stat-ethylene) fractions with 2.7 to 11.0 mol% of ethylene were studied by differential scanning calorimeter, wide- and small-angle X-ray scattering, polarized light microscopy, transmission electron microscopy and infrared spectroscopy. LÄS MER

7. 10. Towards a retro-structural design of degradable aliphatic polyester-based materials

   Författare :Veluska Arias; Ann-Christine Albertsson; Minna Kellomäki; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hydrolysis; polyesters; polylactide; hydrophobicity; crystallinity; miscibility; nanoparticles; stereocomplex; homocomposites; Kemi; Chemistry;

   Sammanfattning : The increasing amount of accumulated plastic waste has led to a continuous search for degradable materials for use in a variety of applications. This eco-friendly approach contemplates the use of degradable alternatives to the inert polymers (the main components in plastics) used today and further engineering of their degradation pathways. LÄS MER