Study On The Synthesis And Spinnabilities Of Novel Biobased Polyamides

The chemical industry has been developing since the past century using petroleum as its primary feedstock. However, with an exponential growth in the demand for fossil raw materials today, eanwhile, we have to face the most critical challenges ever of fossil resource depletion and proliferation of global polutions. Biomass is a feasible substitute, providing many of the same chemical building blocks-plus others that petrochemicals cannot-which are required to fabricate durable and high-performance materials. Therefore, the development of biomass feedstock provides a feasible solution. Based on the research and pre-study on the biobased polyamide fiber and high-performance polyamide fiber, we design a new biobased crosslinkabe polyamide fiber.we report the successful simple synthesis of unique bio-based crosslinkable polyamides by carrying out melting copolycondensation of four monomers derived from large-scaled biomass feedstock:sebacic acid (SA), itaconic acid (IA),1,10-diaminodecane (DD) and1,4-diaminobutane (BD). The chemical and physical properties of the resultant copolyamide poly (buta-co-deca) methylene (itaconic-co-sebac) amides (BDIS) have been investigated. Infrared spectroscopy (FT-IR), gel permeation chromatography (GPC)and other testing equipment were used to characterize the chemical structure and polymer chain structures. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) were used to characterize the glass transition and crystallization properties of the polymers.Biobased polyamide (BDIS) was prepared and was cross-linked by dicumyl peroxide (DCP). The state of cure was observed in vulcameter, and the vulcanization condition was determined subsequently. The cross-linking efficiency of BDIS/DCP blends was assessed using torque, gel content measurements. The crosslinking temprature should be170℃. Optimal mechanical properties were obtained with concentration of about5wt%DCP.Using melt spinning method and electrostatic spinning method respectively to spin, effects of the spinning process conditions and post-processing conditions on the fiber structures were investigated during the melt spinning process. The results showed that the breaking strength of biobased polyamide(BDIS) melt-spun fiber can reach to535.15MPa, close to the conventional PA6fiber. For the electrospinning, the spinning conditions, such as the voltage, the reception distance were studied in detail, and we found that formic acid as solvent was good for spinning, the best spinning solution concentration is15%wt.