Effect of dissolved carbon dioxide on the glass transition and crystallization of poly(lactic acid) as probed by ultrasonic measurements
Tóm tắt
The effects of dissolved carbon dioxide (CO2) molecules on the glass‐transition temperature as well as the crystallization kinetics of poly(lactic acid) have been investigated with a novel device that combines ultrasonic and volumetric measurements. Ultrasonic parameters such as the sound velocity are very sensitive to crystallization and can be used to monitor the crystallization kinetics. The glass‐transition temperature has been found to decrease nonlinearly as the CO2 concentration increases. The maximum in the crystallization rate has been found to increase with the addition of CO2. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Từ khóa
Tài liệu tham khảo
Sato Y., 2003, Polym‐Supercrit Fluid Syst Foams, 83, 2993
Piché L.;Massines F.;Hamel A.;Néron C.U.S. Pat. 4 754 645 (1988).
Liegey F., 2004, Proc Soc Plast Eng Annu Tech Conf, 1300
Sato Y., 2000, Jpn Symp Thermophys Prop, 21, 196
Hu X., 2005, Proc Soc Plast Eng Annu Technol Conf, 2670