| Nylon has been widely used because of its outstanding mechanical property, hydrophilicityand dyeing property. Nylon is the second largest synthetic fibers. The petroleum-based PA6andPA66are primary in the present industry. Development of renewable resource which can replacethe oil has been included in the national key technology research. So the biological based materialis the best alternative. The bio-PA56in this paper refers to bio-based adipic acid-1,5-diaminopentane which is synthesized by bio-based pentamethylene diamine and petroleum-basedadipic acid. The content of diamine polymer made by biological method is41%. We would costless by using biological based pentamethylene diamine than petroleum based pentamethylenediamine and lays the foundation for the large-scale production of bio-PA56. The properties of bio-PA56polymer and its filaments were studied and compared with petroleum based PA66and PA6.The results showed that the bio-based PA56was biological fibrous material with wide prospect ofapplication. It is expected that the paper has a good reference guide for the research testing andsubsequent mass production of bio-based PA56, thus producing the advantages of low cost andenvironmental protection.The main contents and results of the research are listed as follows.（1） The structure of the bio-PA56polymer is characterized by infrared spectroscopy,nuclear magnetic resonance elemental analysis and so on. The actual results and theoreticalstructure of biomass of nylon56were same. Also it is found that the bio-56has the infraredspectrum characteristic peak which is different from other nylon materials.（2） The TG test showed that bio-PA56had good thermal stability at the range spinningtemperature so that it could meet the needs of spinning. The DSC test showed that melting point ofbio-PA56was250℃or so and crystallization peak temperature is200℃or so. The melting point and crystallization temperature of PA56for different molecular weight PA56are not quitedifferent.（3） Bio-PA56particles of different relative viscosities were used to conduct high speedspinning and low speed spinning. By the two-step preparation of high speed spinning and tensileprocess, the reasonable spinning process is formulated. The spinning and winding process is stable,the forming and spinning performance is good.（4） The crystallinity of bio-PA56filaments was researched by x-ray diffraction method. Thedegree of orientation is researched by XRD test. Using tensile instrument the mechanicalproperties were tested including breaking stress, breaking elongation, initial modulus, elongationat elastic recovery rate of10%and20%etc. Compared with filaments of PA6and PA66, bio-PA56had similar tensile strength, showing softer and having better elastic recovery performance.So it could meet the needs of clothing product.（5） The moisture regain and boiling water shrinkage rate of filaments were tested.Themoisture absorption performance of bio-PA56sample was apparently higher than those of PA6and PA66. The boiling water shrinkage rate was higher than those of PA6and PA66.（6） Compared with filaments made by low-speed spinning, it is not quite different for theproperties of crystallinity, orientation degree, elongation, elastic recovery rate, boiling watershrinkage rate and moisture regain of high-speed spinning; however, in the aspects of breakingstrength, initial modulus and breaking elongation, the performance of filaments made by high-speed spinning was obviously better. Thus the mechanical properties of high speed spinningfilament was better. |
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