The Study of Positive Temperature Coefficient Effect of Polylactide Acid

• Main Authors: Szu-Ju Wang, 王思儒
• Other Authors: 芮祥鵬
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/pvch4v

碩士 === 國立臺北科技大學 === 有機高分子研究所 === 96 === This experiment uses the polylactide acid (PLA) as a host material, carbon black (CB) as the pack conductors and adds a small amount of multi-walled carbon nanotubes (MWNTs). Then the polymers were mixed under the state in melting by a Brabender Plastograph, and we found that the polymers composite has a good conductive. The main direction of this research is to observe the composite Positive Temperature Coefficient (PTC) and Negative Temperature coefficient (NTC) effect that relates to concentration of carbon black and carbon nanotubes. PTC effect will make the resistance value rise while the temperature rises, and can apply to the overheated protector. On the contrary, NTC effect will make the resistance value down while the temperature rises. The former experiment usually uses the high density polyethylene (HDPE) and the carbon black (CB) as the composite. Now we replace the polylactide acid (PLA) with the high density polyethylene (HDPE) and see what will be at the end. Polylactide acid is the biodegradable polymer which can reduce the environmental pollution. To add a small amount of carbon nanotubes in composite hoping improve conductive.