彩色棉纤维发育过程中超分子结构变化与纤维品质的关系

以棕絮1号、新彩棉1号、陇绿棉2号、绿1-4560和普通白色棉对照品种鲁棉研28为试验材料,利用X-射线衍射技术,研究了彩色棉纤维发育过程中纤维品质与超分子结构的动态变化规律及它们之间的关系,旨在探寻彩色棉纤维品质差的原因。结果表明,各供试品种的最终棉纤维长度、3.2mm隔距比强度、成熟度及马克隆值均表现为白色棉鲁棉研28棕色棉棕絮1号和新彩棉1号绿色棉陇绿棉2号和绿1-4560;相应的横向晶粒尺寸均随纤维发育进程不断增大,取向参数逐渐减小(优化),但不同品种间存在差异。与白色棉鲁棉研28相比,棕色棉棕絮1号和新彩棉1号纤维的横向晶粒尺寸初始值低,日增幅偏大,终止值略低;取向参数初始值低,日变幅小,终止值偏高;绿色棉陇绿棉2号和绿1-4560纤维的横向晶粒尺寸初始值低,日增幅小,终止值偏低;取向参数初始值高,日变幅小,终止值高。相关分析显示,彩色棉纤维的横向晶粒尺寸与3.2mm隔距比强度密切相关(r=0.89621*),ψ角和φ角与3.2mm隔距比强度、成熟度、马克隆值呈显著负相关(r=-0.93816*～-0.90233*),α角与纤维长度极显著负相关(r=-0.97314**)。表明彩色棉纤维品质差与纤维发育过程中横向晶粒尺寸初始值和终止值低及取向参数终止值高,进而影响纤维3.2mm隔距比强度、成熟度、马克隆值和纤维长度有关。

Relationship between Super-Molecular Structure Changes and Fiber Quality in Fiber Development Process of Colored Cotton Cultivars

In order to explore the reasons for poor quality of colored cotton fiber, the experiments were conducted with five cotton (Gossypium hirsutum L.) cultivars, including Zongxu 1 (ZX1), Xincai 1 (XC1), Longlümian 2 (G-7), Lü 1-4560(4560), and the contrast of white cotton Lumianyan 28 (LMY28). Dynamic changes of super-molecular structure and fiber quality and the relations between them in fiber development process of colored cotton were studied by X-ray diffraction technique. The results showed that the ultimate fiber length, fiber 3.2 mm gauge tenacity, fiber maturation and fiber micronaire of all cotton cultivars ranked as LMY28>ZX-1 and XC-1>G-7 and 4560. The corresponding crystalline grain size increased constantly and orientation parameters diminished gradually in fiber development process, but there were differences among different cultivars. Compared with the white cotton LMY28, ZX-1 and XC-1 had low initial value, too large amplitude and slightly lower termination value for crystalline grain size of fiber; low initial value, small diurnal variation and high termination value for orientation parameters. For G-7 and 4 560 fibers, the initial value of crystalline grain size was low, the increased amplitude was small and the termination value was slightly lower; the initial value of orientation parameters was high, diurnal variation was small and the termination value was high. The crystalline grain size had a correlation with 3.2 mm gauge tenacity (r=0.89621^*), as well as, the orientational distribution angle-ψ (°) and spiral angle-φ (°) had a negative correlation with fiber 3.2 mm gauge tenacity, fiber maturation and fiber micronaire (r= –0.93816^* ~ –0.90233^*), moreover, the orientational separate angle –α (°) had a negative correlation with fiber length (r= –0.97314^**). In conclusion, the poor quality of colored cotton fiber is probably in relation to poor fiber 3.2 mm gaugetenacity, fiber maturation, fiber micronaire, fiber length, resulting from low initial value and termination value of crystalline grain size and high termination value of orientation parameters in fiber development process.