Luminescence Characterization of Thermosetting Polymer and Its Composites

• Main Authors: Jiann-Tyng Guo, 郭建廷
• Other Authors: Rong-Hsien Lin
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/31485945758414462964

碩士 === 國立高雄應用科技大學 === 化學工程系碩士班 === 94 === This research mainly divides into two parts including the fluorescence characterization of the cyanate ester and the fluorescence characterization of the BADCy/MEH-PPV. The first research is focused on the investigations of the fluorescence characterization of the triazines formed from the polycyclotrimerization of bisphenol A dicyanate ester (BADCy). Meanwhile, the model compounds with different substitution groups (2,4,6-triphenoxy-1,3,5-triazine; TPOT, 2,4,6-triphenyl-1,3,5-triazine; TPT and tricumyl phenol-1,3,5-triazine; TCT) were utilized to illustrate the effect of substitution group on the emitting wavelength and intensity. The results suggest that the fluorescence intensity of cured BADCy steadily increases with the increase of the conversion, then reaches a maximum value with a certain conversion, finally decays with a higher conversion. The same trend was observed in cured TCT system with different concentrations of triazine rings. In the UV/Vis spectrum, the onset absorption of BADCy showed red shift with the increase of the concentration of traizine Eventually, the increase of the self-absorption at high concentration of triazine leads to the decay of fluorescence intensity. It is inferred from the studies of the model compound that the fluorescence characterization of cured BADCy is attributed to its substitute groups. The second research is focused on the investigations of the fluorescence characterization of the blend poly(2-methoxy-5-(2’-ethylhexyloxy)-1,4- phenylene vinylene) (MEH-PPV) and bisphenol A dicyanate ester (BADCy). The results suggest that the presence of a small amount of MEH-PPV in the blend of BADCy/MEH-PPV enhance the quantum yield of MEH-PPV either in the uncured BADCy/MEH-PPV system or in the cured BADCy/MEH-PPV SIPN composite system, probably due to the reduction of intermolecular quenching of MEH-PPV component screened in the matrix. The PL quantum yield of the blend was enhanced to 2-4 times of that of uncured system of SIPN system. Slight blue-shift was observed in the cured BADCy/MEH-PPV SIPN system as compared with neat MEH-PPV system, probably due to the change of the configuration of MEH-PPV in blend and hence the reduction of chain-chain energy transfer between MEH-PPV molecular. The SIPN composites was highly thermostable via TGA analysis.