Florencia Muratore , Patricia P. Miranda-Villa , Nicolás A. Gañán , Raquel E. Martini , María L. Goñi
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引用次数: 0
摘要
在这篇贡献中,系统地研究了超临界处理和R-(-)-香芹酮的掺入对不同温度(40°C和60°C)、二氧化碳密度(278 kg m−3和683 kg m−3)和减压速率(0.6 MPa min−1和6.0 MPa min−1)条件下聚乳酸膜的结晶、热性能和力学性能的影响。观察到scco2诱导结晶,高达~ 32 %,并且根据工艺变量获得不同的晶体形态,影响力学行为。统计分析表明,温度- co2密度相互作用是影响结晶形态和力学性能的主要因素,尤其是弹性模量和伸长率。最终性质也强烈依赖于香芹酮的负载,表明相分离的发生在~ 10 wt%以上。这里得到的结果提供了有用的信息,为深入了解主要工艺变量的个别影响和负载到聚合物基体中的活性化合物的量对薄膜最终行为的影响。
Supercritical CO2 processing of polylactic acid films: Effect of process variables and the incorporation of R-carvone on crystalline, thermal, and mechanical properties
In this contribution, a systematic investigation of the effect of the supercritical processing and the incorporation of R-(–)-carvone on the crystalline, thermal, and mechanical properties of polylactic acid films at different temperature (40 °C and 60 °C), CO2 density (278 kg m−3 and 683 kg m−3) and depressurization rate (0.6 MPa min−1 and 6.0 MPa min−1) conditions was performed. scCO2-induced crystallization was observed, up to ∼32 %, and different crystal morphologies were obtained depending on the process variables, affecting the mechanical behavior. Statistical analysis showed that temperature-CO2 density interaction was the main factor affecting crystalline morphology and the mechanical properties, especially the elastic modulus and elongation. Final properties also depended strongly on the carvone loading, suggesting the occurrence of phase separation above ∼10 wt%. The results obtained here provide useful information for a deeper knowledge of the individual effect of the main process variables and the amount of active compound loaded into the polymer matrix on the film final behavior.
期刊介绍:
The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics.
Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.