Non-isothermal Crystallization Kinetics of Kaolin Modified Polyester

• 作 者: 张瑞欣 陈国强
• 机 构: College of Textile and Clothing Engineering,Soochow University,
• 出 处: Journal of Wuhan University of Technology(Materials Science
• 发表日期: 2011年05期
• 关键词: polyester crystallinity isothermal calorimetry completion kinetics crystalline m

Fiber-class modified kaolin and PET have been blended in the twin-screw and granulated to chips containing 4 wt% of kaolin.Non-isothermal crystallization process of kaolin modified polyester was investigated using a differential scanning calorimetry (DSC),and the addition of kaolin enhances either the melting temperature (Tm) or the crystallization temperature (Tc).The morphology of kaolin modified polyester,the melt of which is cooled at different cooling rate,was observed by scanning electron microscope (SEM).The relationship between Tc and cooling rate F was studied.Semi-crystalline phase t1/2 makes an exponential decline with increasing F,and the higher the cooling rate,the shorter the time of crystallization completion.Non-isothermal crystallization kinetics parameters and the activation energy were calculated,indicating that the higher rate of cooling needs the higher relative crystallinity in the unit crystallization time,the crystallization rate increased while speeding up the temperature reduction,and the activation energy ΔE was calculated to be-204.1566 kJ/mol for the non-isothermal crystallization processes by the Kissinger’s methods.

Fiber-class modified kaolin and PET have been blended in the twin-screw and granulated to chips containing 4 wt% of kaolin. Non-isothermal crystallization process of kaolin modified polyester was investigated using a differential scanning calorimetry (DSC), and the addition of kaolin enhances either the melting temperature (Tm) or the crystallization temperature (Tc). The morphology of kaolin modified polyester, the melt of which is cooled at different cooling rate, was observed by scanning electron microscope (SEM). The relationship between Tc and cooling rate F was studied. Semi-crystalline phase t1 / 2 makes an exponential decline with increasing F, and the higher the cooling rate, the shorter the time of crystallization completion. Non-isothermal crystallization kinetics parameters and the activation energy were calculated, indicating that the higher rate of cooling needs the higher relative crystallinity in the unit crystallization time, the crystallization rate increased while speeding up the temperature reduction, and the activation energy ΔE was calculated to be-204.1566 kJ / mol for the non-isothermal crystallization processes by the Kissinger’s methods.