文献类型：期刊文献

中文题名：脂肪族聚酰胺热膨胀行为的研究

英文题名：THERMAL EXPANSION BEHAVIOR OF ALIPHATIC POLYAMIDES

作者：江建第[1];张昆[1];刘重阳[1];吴国章[1]

机构：[1]华东理工大学材料科学与工程学院上海市先进聚合物材料重点实验室,上海200237

年份：2013

卷号：23

期号：2

起止页码：255

中文期刊名：高分子学报

外文期刊名：Acta Polymerica Sinica

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000318196800015)】；北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：国家自然科学基金(基金号50873033);中央高校基本科研业务费(项目号WD1113011)资助项目

语种：中文

中文关键词：聚酰胺;热膨胀;氢键

外文关键词：Polyamides, Thermal expansion, Hydrogen bond

摘要：通过热膨胀测试,示差扫描量热分析(DSC)、广角X射线衍射(WAXD)与傅里叶变换红外光谱(FTIR)等方法研究了4种脂肪族聚酰胺玻璃化转变温度(Tg)、结晶行为以及氢键强度对热膨胀行为的影响,探索了影响脂肪族聚酰胺热膨胀的本质.DSC和X射线衍射结果表明,聚酰胺中结晶部分的热膨胀系数要低于无定形部分,但聚酰胺的熔融温度和结晶度对热膨胀的影响不够明确.相比较其它脂肪族聚酰胺,聚酰胺56(PA56)具有较高的玻璃化转变温度和较低的亚甲基/酰胺基(CH2/CONH)比例,表现出较低的热膨胀系数.研究发现,在相同条件下制备的脂肪族聚酰胺体系中,CH2/CONH比例或Tg与热膨胀系数具有明显的线性关系,随着CH2/CONH比例的降低或Tg的升高,热膨胀系数显著减小.FTIR的结果表明,聚酰胺分子链间的氢键密度和氢键强度随温度升高衰减的程度是影响其热膨胀行为的关键因素.
The influences of the glass transition temperature, the crystallization behavior and the hydrogen bond strength on the thermal expansion behavior of four types of aliphatic polyamides were studied in details by thermal expansion test, differential scanning calorimetry （DSC） , wide-angle X-ray diffraction （WAXD） and Fourier transform infrared spectroscopy （FTIR）. DSC and X-ray diffraction results showed that the coefficient of linear thermal expansion （CLTE） of crystalline part is lower than that of amorphous part for different types of aliphatic polyamides. However, the influences of the melting temperature and erystallinity of the aliphatic polyamide on CLTE are not clear. Polyamide 56 （PA56） owning a higher glass transition temperature and a lower ratio of methylene/amide groups （CHJCONH） shows a much lower CLTE value than other aliphatic polyamides. Further experimental results showed that when all of these specimens were prepared under the same procedure and conditions,a linear relationship between CH2/CONH ratio or glass transition temperature and CLTE could be obtained for the aliphatic polyamide systems. It was found that a further decrease in CLTE could be achieved either by increasing T or by decreasing the CHa/CONH ratio of the polyamide chains. FTIR results confirmed that the density and strength of hydrogen bonds are the key factors influencing the thermal expansion behavior of aliphatic polyamides.