Enhancement of fiber structure formation of a liquid crystalline copolyester via ultra-high speed bicomponent spinning with poly(ethylene terephthalate)
Enhancement of fiber structure formation of a liquid crystalline copolyester via ultra-high speed bicomponent spinning with poly(ethylene terephthalate)
复制标题
通过聚对苯二甲酸乙二醇酯超高速双组分纺丝增强液晶共聚酯的纤维结构形成
DOI：
10.1002/pen.11399
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发表时间：
1999
影响因子：
3.2
通讯作者：
N. Okui
中科院分区：
文献类型：
--
作者：
J. Radhakrishnan;Hiroshi Ito;T. Kikutani;N. Okui
采用两种不同的挤出体系对热致液晶共聚酯、聚羟基苯甲酸-聚对苯二甲酸乙酯（LCP）和聚对苯二甲酸乙酯（PET）进行共挤出，形成鞘芯型生物组分纤维。双组分纤维的纺丝速度可达8 Km/min。纺丝纤维中单个组分的结构表征表明，与相应的单组分纤维相比，PET组分的取向发育明显受到抑制。通过简单的混合规则估计，在4 km/min的吸收速度以上，观察到LCP核心组分的拉伸模量显着增加。拉伸模量的增加是由于高速纺丝过程中产生的高水平应力和高速纺丝过程中产生的热应力变化以及双组分纺丝过程提供的热应力变化历史共同作用导致LCP芯的整体取向增加。通过对单组分和双组分纺丝细化行为的在线研究，了解纺丝动力学，提高了LCP的加工性能和结构发展水平。
A thermotropic liquid crystalline copolyester, poly(hydroxybenzoic acid-co-ethylene terephthalate) (LCP), and poly(ethylene terephthalate) (PET) were coextruded using two different extrusion systems to form sheath-core type biocomponent fibers. The bicomponent fibers could be spun up to a take-up velocity of 8 Km/min. The structural characterization of the individual components in the as-spun fibers showed that the orientation development in the PET component was significantly suppressed compared with the corresponding single component fibers. A significant increase in the tensile modulus of the LCP core component, which was estimated by the simple rule of mixtures, was observed above a take-up velocity of 4 km/min. The increase in tensile modulus was attributed to the increase in the overall orientation of the LCP core resulting from the combination of the high levels of stress generated during spinning at very high speeds and the altered thermal and stress generated during spinning at very high speeds and the altered thermal and stress histories provided by the bicomponent spinning process. On-line study of the thinning behavior of single component and bicomponent spinning was carried out in order to gain an understanding of the spinline dynamics, which improved the processability and structure development of LCP.