关键词: X射线衍射, 应力木, 纤丝角

Abstract: This paper demonstrates strictly the method of measuring mean microfi-bril angles of wood by using X-ray (002) diffractograms, It also explainswhy the microfibril angles mesured before by separation were smaller thanmeasured by other methods, based on recent method, we measured Masson pineand I-69 Poplar, and explained reasonably various shapes of diffractograms,the value of microfibril angles with different annual rings in different zonesof reaction wood is determined, the relationship between microfibril angleand longitudinal tensile strength is also surveyed, diffractograms can be usedto determine the possible existance of g-layer as well as the ratio of thickn-ess between S₁、S₃ and S₂ layers, moreover microfibril angle is an importantfactor reflecting longitudinal tensile strength of wood, while the former islinearly dependent upon the latter.

Key words: X-ray diffraction, Reaction wood, Microfibril angle