Structural study of oriented non-crystalline PET by CDF method

The two-dimensional wide angle X-ray scattering (WAXS) intensities of oriented non-crystalline polyethylene terephthalate (PET) films extended umaxially are collected by the symmetrical transmission method; he-sides,the overlapped non-crystalline peaks at WAXS intensity curves,I(K) obtained at different azimuthal angles are also separated by computer,resulting in two peaks caused by interchain atomic scattering in the reciprocal space,KA(K=0.122),KB(K=0.171),and the other two peaks from intracham atomic scattering,Kc(K=0.310) and KD(K=0.548); their cylindrical distribution functions (CDF),CDF(R,α) in the real space are further calcu lated from the intensity functions,IE(K) using sampled transforms,thereof arising in turn the peaks in the real space as,RA(R=0.658),RB(R=0.456),RC(R=0.253) and RD(R=0.152),corresponding to KA,KP,K,and KD The equivalent relationships and distribution characteristics of the above-mentioned corresponding peaks in the reciprocal and real space,as well as their sources of struc

Structural study of oriented non-crystalline PET by CDF method

The two-dimensional wide angle X-ray scattering (WAXS) intensities of oriented non-crystalline polyethylene terephthalate (PET) films extended uniaxially are collected by the symmetrical transmission method; besides, the overlapped non-crystalline peaks at WAXS intensity curves, I_C(K, ϕ) obtained at different azimuthal angles are also separated by computer, resulting in two peaks caused by interchain atomic scattering in the reciprocal space,K _A (K = 0.122),K _B (K = 0.171), and the other two peaks from intrachain atomic scattering.K _c (K = 0.310) and K_D (K = 0.548); their cylindrical distribution functions (CDF). CDF(R,a) in the real space are further calcu-lated from the intensity functions, I_E(K, ϕ), using sampled transforms, thereof arising in turn the peaks in the real space as,R _A(R = 0.658),R _B(R =0.456),R _c(R = 0.253) andR _D (R = 0. 152). corresponding to K_A, K_B,Kc andK _D . The equivalent relationships and distribution characteristics of the above-mentioned corresponding peaks in the reciprocal and real space, as well as their sources of structure are analysed theoretically and the fine structural information from oriented non-crystalline PET is in detail investigated as well. Project supported by the National Natural Science Foundation of China and the Natural Science Foundation of Cuangdong Province.