摘要
采用差示扫描量热法研究了熔融共混聚己内酰胺/聚对(间)苯二甲酸己二胺(PA6/PA6IcoT)相容体系的结晶温度、结晶程度以及结晶动力学,并通过热台偏光显微镜、广角X射线衍射仪观察了PA6/PA6IcoT共混体系的结晶相形态和晶体结构。结果表明,共混物的结晶行为与其组成、结晶温度区域密切相关。在非等温结晶时,随着非晶态PA6IcoT含量的增加,PA6相的相对结晶度增加,部分晶体结构由γ晶型转变为较完善的α晶型。在较高温度区域结晶时,少量的PA6IcoT就能使串并的晶核分开,形成大量微小晶粒。当PA6IcoT含量继续增加时,球晶数目会减少但尺寸增大。等温结晶动力学研究发现,结晶速度随PA6IcoT含量的提高而下降,Avrami指数值在4.5～6之间,并随着结晶温度升高而增大。
Crystallization behavior of melting blends between semi-crystalline aliphatic polyamide （PA6） and amorphous semi-aromatic polyamide （PA6IcoT） was studied. Differential scanning calorimetry （DSC） was used to investigate crystaUinity, crystallization temperature and the crystallization kinetics. Polarized light microscopy （POM） with on-line hot stage was utilized to observe crystallization phase behavior, while wide-angle X-ray diffraction （WAND） was applied to identify the structure of resultant crystals. It has been shown that the increase of PA6IcoT composition will lead to decrease in overall crystallinity but increase in relative PA6 crystallinity at nonisothermal crystallization process, and small amount of PA6IcoT will lead to smaller size of nucleus compared to pure PA6. According to the isothermal crystallization kinetics, the increase in PA6IcoT fraction resulted in the decrease of crystallization rate, the Avrami exponent is increased from 4.5 to 6 when the crystallization temperature is increased.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2009年第9期101-104,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金重大项目(50390097)
