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| 热历史对尼龙1212熔融行为的影响 | |
| 引用本文： | 张成贵,孙春红,张晓静,韩志超,赵清香.热历史对尼龙1212熔融行为的影响[J].高分子学报,2009,0(11):1126-1131. |
| 作者姓名： | 张成贵 孙春红 张晓静 韩志超 赵清香 |
| 作者单位： | 1. 郑州轻工业学院材料与化工学院,河南省表界面重点实验室,郑州,450002 2. 高分子物理与化学国家重点实验室,高分子科学与材料联合实验室,中国科学院化学研究所,北京,100190 3. 郑州大学材料工程学院,郑州,450052 |
| 基金项目： | 高分子物理与化学国家重点实验室开放基金，河南省教育厅自然科学基金，郑州轻工业学院博士科研基金 |
| 摘 要： | 利用DSC方法研究了不同热历史条件对尼龙1212熔融行为的影响.不同的热历史条件下,在DSC曲线上,观察到尼龙1212产生2个或3个熔融峰,依据聚合物结晶理论,对各峰的来源进行了分析.在160℃下不同温度退火120 min的尼龙1212样品DSC曲线上,低温结晶熔融峰主要由低温结晶形成的一些微晶体或者片晶熔融产生,其晶体完善程度较差,熔融峰值较低,峰面积较小;主熔融峰是由样品在淬火过程中形成的晶体和升温过程中低温结晶形成的晶体的熔融重结晶形成较为完善的晶体熔融所产生,熔融峰值较高,峰面积较大.在不同的升温速率条件下,熔融峰温度有所移动,表明不同升温速率条件下产生的熔融峰的结晶晶型是相同的.在不同结晶时间下结晶,延长结晶时间对较高完善程度晶体的生长有利.在不同温度下依次退火处理的样品,熔融产生两个附加峰,这两个附加峰的峰温都比它们相应的退火温度高,而峰高和峰面积随退火温度降低而减小.根据等温结晶结果,由Hoffman方法确定了尼龙1212的平衡熔融温度为202.8℃. |
| 关 键 词： | 尼龙1212 结晶 退火 熔融 |
| 收稿时间： | 2008-12-02 |
EFFECT OF THERMAL HISTORY ON THE MELTING BEHAVIOR OF NYLON 1212 |
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| ZHANG Chenggui,SUN Chunhong,ZHANG Xiaojing,HAN Charles C,ZHAO Qingxiang.EFFECT OF THERMAL HISTORY ON THE MELTING BEHAVIOR OF NYLON 1212[J].Acta Polymerica Sinica,2009,0(11):1126-1131. | |
| Authors: | ZHANG Chenggui SUN Chunhong ZHANG Xiaojing HAN Charles C ZHAO Qingxiang |
| Institution: | College of Material and Chemical Engineering, Zhengzhou University of Light Industry;Key Laboratory of Surface &; Interface Science of Henan Province, Zhengzhou 450002, State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory, of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, College of Materials Engineering, Zhengzhou University, Zhengzhou 450052 |
| Abstract: | The effect of thermal history on the melting behavior of nylon 1212 has been studied by differential scanning calorimetry (DSC). Two or three melting peaks were observed on DSC curves at different thermal history.The mechanism of melting peaks of nylon 1212 was analyzed according to the theory of polymer crystallization. Lower temperature melting peaks (P_I) in DSC curves were mainly attributed to melting of minicrystal or lamellar crystal which developed from nylon 1212 annealed for 120 min at different temperatures. The peak temperature of these peaks is low, and their area is small. The main melting peak ( P_Ⅲ ) is the melting of perfect crystals which are formed in a recrystallization process of the polymer after P_Ⅰ and P_Ⅱ. The value of main peak temperature is much higher and the area is much larger. The melting peak ( P_Ⅱ ) might be developed from melting of crystals which formed during quenched process of nylon 1212. The position of melting peak changed slightly with different heating rate,which indicates that these crystals have similar form. Increasing crystallization time is favorable for perfect crystals formation. The sample annealed at two different temperatures exhibits two additional melting peaks. Temperatures of these additional melting peaks are higher than annealing temperatures. Moreover, the position and area of additional peak reduced with the annealing temperature decreasing. The equilibrium melting temperature of nylon 1212 was determined as 202.8℃ by Hoffman's method according to results of isothermal crystallization. |
| Keywords: | Nylon 1212 Crystallization Annealing Melting |
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