A series of schematic diagrams of α-series nucleating agent and glass fiber reinforced composites
Mechanisms of β-series nucleating agents regulating the crystallization behavior combined with glass fiber reinforcement to enhance the interfacial adhesion properties of the fiber to the matrix resin
Compared with traditional materials, the new fiber-reinforced polymer composites are widely used in aerospace, military, defense, automotive, shipbuilding, medical equipment, sports equipment, and other fields due to their light weight, high strength, and outstanding overall performance. As one of the five general-purpose thermoplastic resins, polypropylene (PP) is second only to polyethylene and polyvinyl chloride, and has become the fastest growing general-purpose plastic. However, PP still has some deficiencies, such as high shrinkage during processing, low toughness and low impact strength at low temperatures, and easy aging. With the continuous improvement of the comprehensive mechanical properties of materials in new application areas and occasions, the development of new high-performance polypropylene composites has become an important research area in this field.
Inspired by the fiber-reinforcement and transformation-toughening of biomaterials, the research team of the Resource Chemistry Laboratory of the Institute of Physical and Chemical Technology of the Chinese Academy of Sciences Zhang Yagang creatively combined fiber reinforcement and nucleating agents to modulate the crystallization behavior of polypropylene. New method for new polypropylene composites. The method consists of using polypropylene, compatibilizer, glass fiber, nucleating agent and antioxidant as the two-step process. Nucleating agent is used to induce nucleation of polypropylene first, and then it is further compounded with glass fiber for further development. The enhanced method solves the problem that the traditional method directly mixes the polypropylene with the nucleating agent and the fiber. Since the glass fiber is introduced as a foreign impurity, the nucleating agent cannot effectively exert its effect of regulating the crystallization behavior of the polypropylene. .
The research work for the first time systematically studied the effects of different α-nucleating agents and glass fiber composites on the preparation of polypropylene composites. At the same time, the effect of the concentration of nucleating agents on the mechanical properties of polypropylene composites was investigated; a series of simultaneous discoveries were found. PP reaches a rigid-tough equilibrium α nucleating agent/glass fiber combination system and optimum formulation. Related research results were recently published in the international journal "Journal of Applied Polymer Science".
In addition, researchers also investigated for the first time the effect of glass fiber and β nucleating agent on the crystallization behavior and mechanical properties of modified PP in the preparation of polypropylene composites by the combination of glass fiber reinforcement and β nucleating agent-controlled crystallization behaviors. The mechanism of the interfacial adhesion between the reinforcing fiber and the matrix resin was found. It was found that the glass fiber reinforcement can make up for the loss of PP rigidity caused by the modification of the β nucleating agent and greatly improve its comprehensive mechanical properties. The relevant research results were recently published in the international journal RSC Advances.
The research result "a method for preparing polypropylene composites" has been applied for a national invention patent. This method combines the α- and β-series nucleating agents to regulate the crystallization behavior and the glass fiber phase-increase combined to produce high-performance polypropylene composites. A polypropylene composite with a balance of rigidity and toughness was prepared to provide a new idea and method for the design of new polypropylene composites.
The research work was supported by the National Natural Science Foundation of China, the “Thousand Talents Programâ€, Xinjiang Youth Science and Technology Innovation Talents, and the Outstanding Young Scientist Fund.
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