Isotatic polypropylene-b-polyethylene glycol double block copolymer and preparation method thereof

Abstract

The invention relates to polypropylene modification and aims to provide an isotatic polypropylene-b-polyethylene glycol double block copolymer (iPP-b-mPEG) and a preparation method thereof. According to the preparation method, an isocyanate coupling method is adopted, and the preparation method comprises the following steps: introducing isocyanate into the tail end of methoxy polyethylene glycol; coupling isocyanate-terminated polyethylene glycol with hydroxy-terminated isotatic polypropylene, and preparing the iPP-b-mPEG. Compared with the prior art, the preparation method is simple in steps and easy to implement. The used raw materials are common industrial raw materials and are low in cost and easy for industrial production. Lengths of two chain segments can be adjusted, and the performance of the block copolymer is controlled. (A number-average molecular weight of the iPP is 1,000-15,000 g / mol, and a number-average molecular weight of the mPEG is 300-5,300 g / mol). A high isotatic degree of the iPP chain segment in the prepared iPP-b-mPEG is kept.

Description

technical field [0001] The invention relates to polypropylene modification technology, in particular to an isotactic polypropylene-b-polyethylene glycol diblock and a preparation method thereof. Background technique [0002] Due to its good mechanical properties, stable thermal and chemical properties, good electrical insulation properties and high cost performance, polypropylene has been widely used in packaging, automobiles, construction and even military fields. In 2010, the world's polypropylene demand reached 53,570kt, and the total production capacity reached 60,980kt / a. In recent years, the global demand and production capacity of PP have maintained a steady growth momentum. However, due to the chemical inertness of polypropylene itself, the non-polar and crystalline characteristics of its molecular chain make it have low surface energy and hydrophobic characteristics. The extremely low surface energy leads to poor interfacial compatibility of polypropylene when it i...

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Problems solved by technology

Although all the above methods can prepare a two-block copolymer of isotactic polypropylene, there are still various problems: 1) Free radical polymerization cannot achieve controllable molecular weight and structure, and it is difficult to control the properties of block polymers ;2) In controlled free radical polymerization, the ATRP method needs to remove the transition metal complex after the reaction, the preparation process of the dithioester in the RAFT method is complicated and difficult to be applied industrially, and the NMRP method has disadvantages such as a small range of applicable monomers; 3 ) The conditions of anionic polymerization are harsh, and large-scale industrial production cannot be realized; 4) The preparation process of click chemistry is complicated, and there is also the problem of difficulty in subsequent industrialization

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