Synthesis of Hyperbranched Poly(Phenylene Sulfide) and Study on Linear/Hyperbranched Poly(Phenylene Sulfide) Blends
|Course||Materials Science and Engineering|
|Keywords||Hyperbranched Polyphenylene sulfide Thermal degradation Blends Crystallization Fiber|
Hyperbranched polymer having a highly branched, three-dimensional spherical structure, and a large number of terminal functional groups, between molecules tangle-free, and has good solubility, low viscosity, high chemical reactivity, etc., coupled with the dendrimer compared was relatively simple synthetic methods, being more and more attention, and therefore expected that widely used in the polymer processing additives, coatings, composite materials modification. 1, hyperbranched polyphenylene sulfide (HPPS) synthesis and characterization of this paper, a new process to synthesize hyperbranched polyphenylene sulfide. 2,4 - dichlorobenzene thiophenol monomers with N-methyl pyrrolidone as solvent, KOH, and the KCO 3 for the reaction aid, with a \sulfide. Discuss the kind of solvent, the amount of solvent, type of reaction assistant, reaction additives added amount, reaction time and reaction temperature on the molecular weight of the product. And the physical properties of the obtained product was characterized. 2, hyperbranched polyphenylene sulfide thermal degradation kinetics HPPS thermal degradation of only a single crack stage under nitrogen atmosphere, degradation temperature of about 50 ° C than that of similar molecular weight of linear polyphenylene sulfide, thermal degradation of the residue with a heating rate increases. Of HPPS the degradation mechanism and linear PPS, control of the reaction mechanism for the phase boundary (R 1 ). By isothermal heat degradation, HPPS has good thermal stability in the environment of less than 320 ℃. The isothermal degradation HPPS nitrogen random strand breaks in the process. Hyperbranched polyphenylene sulfide / linear polyphenylene sulfide blends non-isothermal crystallization nonisothermal crystallization process of the PPS discuss results show that the PPS PPS / HPPS blends are available Ozawa equation to describe . With the addition of HPPS PPS crystallization difficult crystallization ability to reduce non-isothermal crystallization rate slows down. 4, hyperbranched polyphenylene sulfide (HPPS) and linear polyphenylene sulfide (PPS) Blends of PPS and HPPS performance verified in the melt blending process of the reactive blending process; adding HPPS total compared to the viscosity of the blends with PPS increased flow behavior more performance sticky pop; Add HPPS, rigidity and toughness of the blends and PPS increased. 5, linear polyphenylene sulfide (PPS) melt spinning this article by melt spinning explore the scope of the PPS resin spinning process of spinning speed, the storage time of the spun fiber supramolecular structure, mechanical properties. Research shows that, within the range of 400 to 800m/min the spinning speed, the fiber having good spinnability, with the increase of the spinning speed, and the nascent fiber orientation, breaking strength, elongation at break little change; storage process, the nascent fiber the orientation of the first elevated to reduce the density, fracture strength, elongation at break. PPS fiber after processing in this article further study drafting ratio, the drawing speed drafting fiber orientation, degree of crystallinity, mechanical properties, heat shrinkable performance. And compare a stereotyped way, the setting temperature, setting time drafting fiber supramolecular structure, mechanical properties. Fiber structure properties were studied according to the drawing, the setting process to determine the process conditions for continuous operation, the strength is 3.7cN/dtex, elongation 22.2%, boiling water shrinkage ratio of 9.6%, forming a well of the PPS fiber. 7, PPS / HPPS Blends spinning molding PPS / the HPPS the spinning and post-processing can be used PPS spinning process parameters, and has good workability. The HPPS the addition of PPS / HPPS fiber than increase in PPS breaking strength.