MOF-199改性聚乳酸复合材料的制备及热力学性能

Preparation and Thermodynamic Properties of PLA Composite Incorporated with MOF-199

以聚乳酸(PLA)为基材,配位聚合物MOF-199为改性剂,采用溶液流延的方式制备了不同MOF-199含量的改性PLA复合材料,通过扫描电子显微镜(SEM)、衰减全反射傅立叶变换红外光谱(ATR-IR)研究了复合材料的形貌和结构,通过热重(TG)、差示扫描量热(DSC)等方式研究了复合材料的热力学性能。结果表明,与纯PLA相比,MOF-199的加入可显著提高PLA复合材料的起始热分解温度,拓宽了PLA复合材料的热加工温度范围,复合材料的玻璃化转变温度、熔融温度和结晶度随MOF-199含量的增加呈现先升高后降低的变化趋势,而冷结晶温度逐渐降低,当M0F499的含量为3%时,复合材料的综合性能最佳,起始热分解温度提高了约36.9℃,结晶度提高了约139%。

Poly (lactic acid)(PLA) based composite with coordination polymer MOF-199 as modifier was prepared by solution casting method.The surface morphology,structure and thermodynamic properties of the composite were studied by scanning electron microscope (SEM),attenuated total reflection infrared spectrum (ATR - IR),thermogravimetry (TG) and differential scanning calorimetry (DSC).The results showed that incorporation of MOF-199 could significantly enhance the initial decomposition temperature,thus the thermal processing temperature range of PLA composite was widened.Also with the increase of MOF-199 content,the glass transition temperature,melting temperature and crystallinity of the composite first increased and then decreased,while the cold crystallization temperature decreased monotonously.The composite containing 3% MOF-199 content presented the best compromised properties,the initial decomposition temperature and crystallinity increased by about 36.9℃ and 139%,compared with PLA.