CAJ | 학술논문

采用自制的低温易膨胀石墨与聚磷酸铵制备阻燃聚乳酸(FR-PLA)复合材料，研究了其在氮气气氛下的热稳定性；采用Kissinger和Flynn-Wall-Ozawa方法分析了PLA和FR-PLA的热降解活化能，利用Badia法确定了PLA和FR-PLA的热降解反应机理。研究表明，低温易膨胀石墨和聚磷酸铵改变了PLA的热降解进程，提高了其高温下的热稳定性；FR-PLA的表观活化能高于PLA的表观活化能，且表观活化能数值变化趋势符合FR-PLA的热降解进程；PLA的热降解动力学模型为成核与生长模型，而FR-PLA的热降解动力学模型为扩散控制模型，即其热分解反应速率受扩散过程控制，符合膨胀阻燃机理。
채용자제적저온역팽창석묵여취린산안제비조연취유산(FR-PLA)복합재료，연구료기재담기기분하적열은정성；채용Kissinger화Flynn-Wall-Ozawa방법분석료PLA화FR-PLA적열강해활화능，이용Badia법학정료PLA화FR-PLA적열강해반응궤리。연구표명，저온역팽창석묵화취린산안개변료PLA적열강해진정，제고료기고온하적열은정성；FR-PLA적표관활화능고우PLA적표관활화능，차표관활화능수치변화추세부합FR-PLA적열강해진정；PLA적열강해동역학모형위성핵여생장모형，이FR-PLA적열강해동역학모형위확산공제모형，즉기열분해반응속솔수확산과정공제，부합팽창조연궤리。
Ammonium polyphosphate and self-made low-temperature expandable graphite were used to prepare flame retarding polylactide(FR-PLA) composites,and the thermal stability under nitrogen was investigated.The activation energies of PLA and FR-PLA were analyzed by Kissenger and Flynn-Wall-Ozawa method.The actual reaction mechanisms of PLA and FR-PLA were determined by Badia method.The results show that the thermal degradation process of PLA is changed by low-temperature and ammonium polyphosphate,thus improving the thermal stability under high temperature.The activation energy of FR-PLA is higher than PLA,and the trend of changes on activation energy against conversion rate are in accordance with the thermal degradation behavior.The decomposition reaction of PLA follows an kinetic model,while those of FR-PLA follows kinetic model,which is in aggrement with intumescent flame retardant mechanism of FR-PLA.