退火温度对尼龙1014熔融与结晶行为的影响
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摘要
将尼龙1014在不同温度下进行退火热处理,采用差示扫描量热仪(DSC)和广角X射线衍射线(WAXD),研究退火温度对尼龙1014熔融与结晶行为的影响。结果表明:尼龙1014经过不同温度退火热处理后,DSC曲线上有2个熔融峰,1个在退火温度附近,另1个在熔点附近,延长退火时间可以提高晶体的完善程度。此外,退火温度低于140℃有利于产生尼龙1014的γ晶型,退火温度升高至140℃以上,有利于产生尼龙1014的α晶型。以上现象表明退火温度对尼龙1014熔融与结晶行为产生了较大影响。
The effect of annealing temperature on melting and crystallization behaviors of nylon 1014 was studied by using differential scanning calorimetry(DSC)and wide angle X-ray diffraction(WAXD)after nylon 1014 was annealed at different temperatures.The results show that there are two melting peaks at DSC curves when nylon 1014 is annealed at different temperatures.One appears near the annealing temperature and another appears near the melting point.The more perfect crystal can be obtained when the annealing time is prolonged.And annealing below 140 ℃ is favorable for producing noly 1014 γ-form crystal.However,when annealing temperature increases above 140 ℃,it is favorable for producing noly1014α-form crystal.These phenomenons illustrate that the annealing temperatures have a great influence on melting and crystallization behaviors of nylon 1014.
The effect of annealing temperature on melting and crystallization behaviors of nylon 1014 was studied by using differential scanning calorimetry(DSC)and wide angle X-ray diffraction(WAXD)after nylon 1014 was annealed at different temperatures.The results show that there are two melting peaks at DSC curves when nylon 1014 is annealed at different temperatures.One appears near the annealing temperature and another appears near the melting point.The more perfect crystal can be obtained when the annealing time is prolonged.And annealing below 140 ℃ is favorable for producing noly 1014 γ-form crystal.However,when annealing temperature increases above 140 ℃,it is favorable for producing noly1014α-form crystal.These phenomenons illustrate that the annealing temperatures have a great influence on melting and crystallization behaviors of nylon 1014.
引文
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[2]LIU M Y,ZHAO Q X,WANG Y D,et al.Melting behaviors,isothermal and nonisothermal crystallization kinetics of nylon 1212[J].Polymer,2003,44:2537-2545.
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