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半结晶聚酯(PET)的二相共存结构的表征

韩甫田 郭立平 刘平安 唐振方 施其宏

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半结晶聚酯(PET)的二相共存结构的表征

韩甫田, 郭立平, 刘平安, 唐振方, 施其宏

CHARACTERIZATION OF THE TWO-PHASE STRUCTURE IN SEMICRYSTALLINE POLY(ETHYLENE TEREPHTHALATE)

HAN FU-TIAN, GUO LI-PING, LIU PING-AN, TANG ZHEN-FANG, SHI QI-HONG
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  • 采用X射线衍射对称反射法,对半结晶聚酯PET2试样收集粉末X射线衍射全图(XDWP)数据,用Rietveld方法和Fourier过滤技术,对XDWP拟合并分离成结晶衍射峰之和CR2和非晶散射峰之和AM2两部分,与此同时获得PET2试样的结晶相CR2的三斜晶系晶胞参数:a=0.445,b=0.592,c=1.072nm,α=99.6,β=116.9,γ=111.9(°),结晶密度dc
    The X-ray diffraction whole pattern (XDWP) data of semicrystalline poly (ethylene terephthalate)PET2 sample were collected in the symmetric reflection geometry on a diffractometer, employing a copper target(Kα wavelength=0.15418nm).The XDWP was fitted by combining the Rietveld method and Fourier filtering technique,Rietveld structure refinement for PET2 crystalline phase was done,the unit-cell parameters obtained being a=0.445,b=0.592,c=1.072 nm,α=99.6,β=116.9,γ=111.9(°),and the density of the sample being dc=1.495(g/cm3).Meanwhile, the XDWP was separated into two parts,CR2 crystalline region and AM2 non-crystalline region in PET2.The reduced radial distribution function G2(r) was calculated from AM2, finding three main peaks,G21(r)=0.150,G22(r)=0.254,G23(r)=0.460 nm, which characterize the structure of the non-crystalline phase in PET2.We suggest that the amorphous curve is best taken as the sum of several non-crystalline scattering peaks.Reliability and reasonableness of the structural parameters of the crystalline phase and the non-crystalline phase are discussed.In conclusion,it is a very effective method that the combination based on the Fourier filtering technique and the full-pattern diffraction least-squares refinement (Rietveld method) and the radial distribution function analyses to study the two-phase structure in semi-crystalline polymers.
    • 基金项目: 国家自然科学基金(批准号:2870258);广东省自然科学基金(批准号:970586)资助的课题.
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  • 文章访问数:  6518
  • PDF下载量:  1731
  • 被引次数: 0
出版历程
  • 收稿日期:  2000-09-15
  • 修回日期:  2000-11-13
  • 刊出日期:  2001-03-05

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