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核磁共振(NMR)技术发现以来,已有三十多年的历史了。它广泛地应用于物理学、化学、化学物理学、高分子物理学、生物物理学等学科的各个领域内。用核磁共振方法来研究聚合物,也有二十多年的历史,现在已经成为研究高分子化合物性质及结构的重要武器。取向研究自1957年Slichtre开创以来,也出现了不少有益的研究。其中日本学者山县恭造、应田澄夫曾用Kratky公式求出二次矩随纤维轴与外磁场夹角的变化关系,与实验相符较好。Miyaket对于各种无定形乙烯型的聚合物计算出分子内部核磁共振的二次矩,依赖于所谓“局部规整参量”Z的公式。1962年(?)和(?)研究了轴结构样品的核磁共振的二次矩公式。次年,苏联学者(?)和(?)较为深入地研究了取向聚合物的核磁共振,给出了既适用于纤维,也适用于薄膜的二次矩公式。同时还研究了聚合链相对于纤维或薄膜伸长方向的几种可能分布函数的情况。1964年我国华师大杨年兹等
Nuclear magnetic resonance (NMR) technology has been discovered for more than three decades. It is widely used in physics, chemistry, chemical physics, polymer physics, biophysics and other disciplines in various fields. The use of NMR to study polymers has more than twenty years of history and has now become an important weapon for studying the nature and structure of polymer compounds. Orientation research Since Slichtre was founded in 1957, there have been many useful studies. Among them, Japanese scholar Yamauchi Kyosuke, Tamiya Husband had used Kratky formula to find the second moment with the change of the angle between the fiber axis and the external magnetic field, which is in good agreement with the experiment. Miyaket calculates the second moment of intramolecular NMR for a variety of amorphous vinyl polymers and relies on the so-called “local regularization parameter” Z. In 1962 (?) And (?) Study of the axial structure of the NMR second moment formula. The following year, the Soviet scholars (?) And (?) Studied the NMR of oriented polymers in more depth and gave the second-moment formula for both fiber and film. Several possible distribution functions of the polymer chains with respect to the direction of elongation of the fibers or films were also studied. China’s National Taiwan Normal University Yang Nizi in 1964 and so on