Modified polypropylene carbonate material and preparation method thereof

Abstract

The invention discloses a modified polypropylene carbonate material and a preparation method thereof. The modified polypropylene carbonate material comprises the following components in percentage byweight: 98%-99.7% of polypropylene carbonate and 0.3%-2% of a polydopamine derivative. The preparation method comprises steps of preparing the polydopamine derivative, and then adding the polydopaminederivative into a polypropylene carbonate matrix by solvent mixing. For the modified polypropylene carbonate material provided by the invention, a 5% weight loss temperature (T5%) at a low content can be increased by more than 30 DEG C in comparison with pure polypropylene carbonate; and a tensile strength can reach 14 MPa or more, and a Young's modulus can reach 700 MPa or more, which are significantly increased in comparison with the pure polypropylene carbonate. The modified polypropylene carbonate material prepared in the invention has characteristics of excellent mechanical properties, thermal stability, environmental friendliness and degradability, and can replace disposable universal plastics in practical application, thereby greatly reducing white pollution.

Description

technical field [0001] The invention relates to the technical field of polymer material modification, in particular to a modified polypropylene carbonate material and a preparation method thereof. Background technique [0002] Since the successful synthesis of polypropylene carbonate (PPC) from propylene oxide and carbon dioxide in 1969, scientists and engineers have paid great attention to related research. However, although the production of polypropylene carbonate has been industrialized, it is far from reaching the point of practical application, because the main chain of polypropylene carbonate is easy to bend, difficult to crystallize, insufficient in mechanical properties, and the bond energy of carbonate bonds is low. Thermal stability is poor. [0003] The mechanical properties and thermal stability can be improved to a certain extent by blending with maleic anhydride, but the residual maleic anhydride is not environmentally friendly. In addition, the thermal stab...

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Problems solved by technology

[0004] Even though polypropylene carbonate is biodegradable and environmentally degradable, its low thermal stability and mechanical properties limit its molding process and application cycle

Therefore, it is still a great challenge to achieve the goal of significantly improving thermal stability and mechanical properties while maintaining environmental friendliness.

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