私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

相關鏈接
聯系方式
  • 通信地址:杭州市浙大路38號浙大玉泉校區第十教學大樓(石化大樓)4111室
  • 郵編:310027
  • 電話:0571-87952631
  • 傳真:0571-87951612
  • Email:wulinbo@zju.edu.cn
當前位置:> 首頁 > 論文著作 > 正文
Thermal stability of aromatic polyesters prepared from diphenolic acid and its esters acid and its esters
作者:Ping Zhang, Linbo Wu*, Bo-Geng Li
關鍵字:Interfacial polycondensation,Aromatic polyester,Diphenolic acid,Thermal decomposition,Thermal stability
論文來源:期刊
具體來源:Polymer Degradation and Stability 94(8): 1261-1266 (2009.08)
發表時間:2009年

The thermal performance of aromatic polyesters prepared from isophthaloyl chloride with diphenolic acid and its esters were studied with DSC and TG,and the decomposition mechanism of poly(DPA-IPC)  were investigated using FTIR and integrated TG/FTIR analyses. As compared with ordinary aromatic polyesters,poly(DPA-IPC)  has lower glass transsition temperatureand much lower  thermal stability . It starts to decompose at about 210 and is characterized by two-stage thermal decomposition behavior ,with active energies of decomposition of 206 kJ/mol and 389kJ/mol,respectively. The analyses of the decomposition process and products indicate that the pendent carboxyl groups in poly(DPA-IPC) are responsible for its low thermal stability. Accordingly,a decomposition mechanism for the  first stage is proposed. With this knowledge in mind, we capped the carboxyl groups in DPA with methyl and ethyl groups to prepare poly(MDP-IPC) and poly(EDP-IPC) from methyl diphenolate and ethyl dipenolate. As expected ,these two polymers exhibit obviously improved thermal stability,with onset decomposition temperature of about 300.

主站蜘蛛池模板: 六枝特区| 肃宁县| 左贡县| 新安县| 府谷县| 越西县| 泽库县| 嘉黎县| 昌乐县| 灵丘县| 丹江口市| 三门县| 抚宁县| 元氏县| SHOW| 阳谷县| 中牟县| 洪雅县| 肇州县| 雅江县| 镇巴县| 景泰县| 永福县| 新疆| 油尖旺区| 嫩江县| 工布江达县| 古丈县| 山西省| 郴州市| 东辽县| 祁连县| 龙江县| 乌鲁木齐市| 犍为县| 图木舒克市| 稻城县| 成安县| 鹿邑县| 高台县| 尼勒克县|