It is reported that a variety of trimethylsilyl enol ethers of ketones and aldehydes can be used to initiate GTP of methacrylates and acryl- ates.The new initiators are easy to prepare from ketones or aldehydes.PMMA a...It is reported that a variety of trimethylsilyl enol ethers of ketones and aldehydes can be used to initiate GTP of methacrylates and acryl- ates.The new initiators are easy to prepare from ketones or aldehydes.PMMA and PMA with controlled molecular weight and low polydispersity were obtained by using non-acetal initiators in the presence of bibenzoate,bifluo ide or Hgl_2,The living nature of polymerization is shown by the correspondence of theoretical and observed molecular weight and the preparation of A-B-A type triblock copolymer with methacrylate and acrylate segments can be prepared.展开更多
The homopolymerization of 5-methyl-5-hexen-2,4-dione (methacryloylacetone, MAA), a vinyl monomer having beta-diketone group, was carried out in the presence of benzophenone (BP)/N, N-dimenthyl-4-toluidine (DMT) system...The homopolymerization of 5-methyl-5-hexen-2,4-dione (methacryloylacetone, MAA), a vinyl monomer having beta-diketone group, was carried out in the presence of benzophenone (BP)/N, N-dimenthyl-4-toluidine (DMT) system. Graft polymerization of acrylamide initiated by eerie ion onto the homopolymer film was investigated and the mechanism of the grafting reaction was proposed on the basis of ESR study. The grafted copolymer was characterized by means of grafting percentage, water absorption, XPS spectra and scanning electron photomicrographs.展开更多
Clique relaxation problems are important extension versions of the maximum clique problem with extensive realworld applications.Although lots of studies focus on designing local search algorithms for solving these pro...Clique relaxation problems are important extension versions of the maximum clique problem with extensive realworld applications.Although lots of studies focus on designing local search algorithms for solving these problems,almost all state-of-the-art local search algorithms adopt a common general initialization method.This paper develops a general group driven initialization method for clique relaxation problems.The proposed method uses two kinds of ways to divide vertices into some subgroups by using the useful information of the search procedure and the structure information of a given instance and then constructs a good initial solution by considering the generated group information.We apply the proposed initialization method to two clique relaxation problems.Experimental results demonstrate that the proposed initialization method clearly improves the performance of stateof-the-art algorithms for the clique relaxation problems.展开更多
文摘It is reported that a variety of trimethylsilyl enol ethers of ketones and aldehydes can be used to initiate GTP of methacrylates and acryl- ates.The new initiators are easy to prepare from ketones or aldehydes.PMMA and PMA with controlled molecular weight and low polydispersity were obtained by using non-acetal initiators in the presence of bibenzoate,bifluo ide or Hgl_2,The living nature of polymerization is shown by the correspondence of theoretical and observed molecular weight and the preparation of A-B-A type triblock copolymer with methacrylate and acrylate segments can be prepared.
基金The project was supported by the National Natural Science Foundation of Chna.
文摘The homopolymerization of 5-methyl-5-hexen-2,4-dione (methacryloylacetone, MAA), a vinyl monomer having beta-diketone group, was carried out in the presence of benzophenone (BP)/N, N-dimenthyl-4-toluidine (DMT) system. Graft polymerization of acrylamide initiated by eerie ion onto the homopolymer film was investigated and the mechanism of the grafting reaction was proposed on the basis of ESR study. The grafted copolymer was characterized by means of grafting percentage, water absorption, XPS spectra and scanning electron photomicrographs.
基金supported by the National Natural Science Foundation of China(Grant Nos.61806050,61976050)CCF Huawei Hu Yanglin Foundation Theoretical Computer Science Project(CCFHuaweiLK2023001)+1 种基金the Fundamental Research Funds for the Central Universities(2412022ZD015,2412023YQ003)Jilin Science and Technology Department(YDZJ202201ZYTS412,20240602005RC).
文摘Clique relaxation problems are important extension versions of the maximum clique problem with extensive realworld applications.Although lots of studies focus on designing local search algorithms for solving these problems,almost all state-of-the-art local search algorithms adopt a common general initialization method.This paper develops a general group driven initialization method for clique relaxation problems.The proposed method uses two kinds of ways to divide vertices into some subgroups by using the useful information of the search procedure and the structure information of a given instance and then constructs a good initial solution by considering the generated group information.We apply the proposed initialization method to two clique relaxation problems.Experimental results demonstrate that the proposed initialization method clearly improves the performance of stateof-the-art algorithms for the clique relaxation problems.
