| Title |
Polivinilo alkoholio, pasižyminčio antipireninėmis savybėmis, sintezė / |
| Translation of Title |
Synthesis of polyvinyl alcohol with flame retardancy properties. |
| Authors |
Skiparis, Germantas |
| Full Text |
|
| Pages |
83 |
| Keywords [eng] |
flame retardants ; char yield ; polyvinyl alcohol ; phosphorolysis |
| Abstract [eng] |
Synthesis of polyvinyl alcohol with flame retardancy properties was achieved by phosphorolysis reaction of various copolymers of polyvinyl alcohol. Phosphorylated polyvinyl alcohol properties was investigated with chemical analysis, thermogravimetric analysis, differential scanning calorimetry methods. Decomposition products of polymers thermal degradation was investigated with gas chromatography mass spectrometry method. It was determined that by increasing phosphorus content in phosphorylated polyvinyl alcohol the char yield during heating in inert and oxidative environment is increased as well due to phosphate catalysed crosslinking reactions. It was found that in higher than 100 °C temperature during phosphorolysis reaction the obtained products had a lower phosphorus content due to ongoing dehydrogenation reactions. Phosphorylated polyvinyl alcohol thermal decomposition occurs in two steps. In the first step phosphate groups catalyzes dehydration reactions. Their temperature depends on phosphate groups concentration in the material: the higher the concentration, the lower temperature needs to be to start dehydration reaction. The second step of decomposition showed weight loss due to macromolecules thermal destruction reactions. |
| Dissertation Institution |
Kauno technologijos universitetas. |
| Type |
Master thesis |
| Language |
Lithuanian |
| Publication date |
2017 |
