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    Home > Chemicals Industry > Chemical Technology > Qingdao Energy Institute has developed a new method of controlled polymerization and efficient depolymerization of polyester

    Qingdao Energy Institute has developed a new method of controlled polymerization and efficient depolymerization of polyester

    • Last Update: 2022-02-03
    • Source: Internet
    • Author: User
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    The "white pollution" produced by discarded plastics is one of the urgent environmental problems
    .
    With the rapid development of science and technology and the enhancement of environmental protection awareness, degradable green functional materials have become an urgent need for social development, and are also the frontier and focus of scientific research

    .
    Aliphatic polyester materials prepared by ring-opening polymerization of lactone monomers (such as polylactic acid PLA, polycaprolactone PCL, polyhydroxy fatty acid PHA, etc.
    ) have good biocompatibility and biodegradability, and physical and mechanical properties, etc.
    It is comparable to petroleum-based plastics, making it an ideal alternative material

    .
    At the same time, in order to further meet the needs of green recycling and sustainable development, the recycling of waste polyester materials has also received extensive attention

    .
    Polyester plastic as a degradable material, although it can be naturally degraded into carbon dioxide and water, it usually requires certain environmental conditions and takes a long time

    .
    Through high-efficiency catalytic depolymerization technology, waste polyester is converted into valuable chemicals, so as to realize the recycling of green degradable materials in the true sense, which has important research value and application prospects

    .

    Recently, the catalytic polymerization and engineering research group led by Wang Qinggang, a researcher at the Qingdao Institute of Bioenergy and Processes, Chinese Academy of Sciences, has developed a catalytic system for the controlled polymerization of lactones and the efficient depolymerization of polyesters (as shown in the picture)
    .
    The catalyst adopts non-toxic and biocompatible metal zinc reagent, which makes the polyester production process and products more green and environmentally friendly

    .
    With the participation of alcohol initiators, the catalytic polymerization system exhibits excellent catalytic polymerization activity for lactone monomers of various structures including lactide, caprolactone, valerolactone, etc.
    , and obtains various structures and properties.
    Different polyester material

    .
    In the process of studying the microstructure of polyester materials, some "chain transfer" polyester products were discovered, indicating that the catalyst also has the function of catalyzing depolymerization

    .
    By changing the reaction conditions, the catalyst can be used to achieve high-efficiency depolymerization of polyester materials under mild conditions, obtain high value-added organic small molecules, and realize the recycling of waste polymers

    .
    This achievement can not only achieve controlled polymerization to obtain polyester materials by using the same catalyst, but also realize waste polyester materials to small molecular compounds through high-efficiency depolymerization, thereby realizing a true green recycling process and better conforming to the principles of sustainable development

    .

    Part of the research results have been applied for international PCT patents and Chinese invention patents, and published on ACS Sustainable Chemistry & Engineering with the title of Zn(HMDS) 2 as a versatile transesterification catalyst for polyesters synthesis and degradation towards a circular materials economy approach.
    PhD student Yang Rulin is the first author of the paper, and associate researchers Xu Guangqiang and Wang Qinggang are the corresponding authors of the paper

    .
    The research work is supported by the National Natural Science Foundation of China, Shandong Talent Engineering Fund, Qingdao Energy Institute’s “One Three Five” key cultivation and two integration funds

    .

    2

    Zn(HMDS) 2 catalyzes ring-opening polymerization of cyclic ester and controlled depolymerization of polyester

    2
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