Introduction of aramid staple fiber
Aramid staple fiber, aromatic polyamide chemical fiber, is a linear polymer composed of aromatic groups and amide groups, which has good physical properties, smooth organic chemical structure, ideal mechanical equipment characteristics, with high compressive strength, high toughness, heat resistance, corrosion resistance, light quality, anti-abrasion and other excellent characteristics.
The carbon chain structure of para-aramid fiber differs from the general soft polymer molecular chains in that it consists of a rod-like molecular structure made up of benzene ring pairs.
The carbon chain of aramid fiber molecules has good neatness and has a stiffness crystalline module, which makes it easy to produce the shape of liquid crystal display. This kind of stiffness molecular chain in the liquid crystal display state, along with the content of the increase can be juxtaposed to produce parallel surface sorting structure, the internal structure of molecular open chain occurs highly ordered, without the unique pulling Shen, only according to the spinning fixed term can achieve flexural chain structure, complete high toughness.
Not only that, in the whole process of spinning, this kind of structure can also be in the restricted space edge of the chemical fiber tends to high density of the double layer stack, prompting high polymer has high compressive strength. Aramid fiber molecular chain along the chemical fiber radial height tends to, the amide group on the hydrogen atom can be able to electronically device with another molecular chain on the carbonyl group to produce covalent bonds, prompting the middle of the molecular chain to establish a covalent bond chemical cross-linking.
Aramid staple fibers include different shapes of supramolecular structures such as skin-core structure, subcrystal structure and microfiber structure. Figure 2 shows a plan view of the internal structural structure of aramid fiber. The epidermal layer of chemical fibers has a smaller glass transition temperature than the core layer, and the thickness of the epidermal layer is about 0.1μm to 1μm (depending on the type of chemical fiber and spinning process).
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