Synthesis and application of polyethylene-based functionalized hyperbranched polymers

(α-Diimine)palladium catalyzed ethylene polymerization and (co)polymerization with polar comonomers

“…Since Brookhart et al's initial reports [3], numerous modifications on the -diimine ligand have been made, including steric tuning, electronic perturbation, ligand backbone adjustment, and so on [14,15,[42][43][44][45][46][47][48][49][50][51][52][53]. The ortho-aryl substituents can efficiently suppress the associative chain transfer by sterically blocking the access of the monomer to the axial positions of the metal coordination site ( Figure 3).…”

“…Similarly, the low ethylene pressure favors the formation of hyperbranched polymers with long chain branch-on-branch structures, while the higher ethylene pressure leads to less entangled structures with a larger number of terminal branches, resulting in the production of interesting copolymers with tailored topologies. In addition, alkyl acrylates (CH 2 CHC-OOR) are promising for the functionalization of polyethylene because the properties of products can be simply adjusted by the variation of the R group [44], which are generally located at the end of the branches due to chain walking after an insertion of these polar monomers.…”

“…Pd-catalyzed polymerization of cycloolefins, dienes, trienes [32][33][34][35][36][37][38][39][40][41][42][43] and norbornene type monomers [36,37] are not included in this review. Furthermore, there have been numerous studies on the polymerization and copolymerization of functionalized olefins or acrylates monomers to prepare various functionalized hyperbranched polymers using this class of catalysts [38][39][40][41][42][43][44]. Recently, this subject has been reviewed [42][43][44], and is beyond the scope of this review.…”

“…Furthermore, there have been numerous studies on the polymerization and copolymerization of functionalized olefins or acrylates monomers to prepare various functionalized hyperbranched polymers using this class of catalysts [38][39][40][41][42][43][44]. Recently, this subject has been reviewed [42][43][44], and is beyond the scope of this review. Herein, we will mainly focus on recent investigations on the design of new ligands and especially the mechanistic details for the homo-and copolymerization of ethylene and polar comonomers using cationic Pd(II) -diimine based complexes.…”

Hyperbranched polyglycerol nanoparticles based multifunctional, nonmigrating hindered phenolic macromolecular antioxidants: Synthesis, characterization and its stabilization effect on poly(vinyl chloride)

“…Hyperbranched polymers are unique nanoparticles, many of which possess multiple functional terminal sites, some of them pendant functionalities as well, capable to function as starting materials for new nanostructured substances not existed before [1][2][3][4][5][6][7][8]. Among such highly branched macromolecules, hyperbranched polyglycerol (HbPG) with average diameter in the few nanometer range (~2-20 nm) and with both chain end and pendant hydroxyl functionalities offers a variety of new derivatization processes to obtain materials with advantageous application possibilities, ranging from biomedicine to nanotechnologies and large scale commodities as well [9][10][11][12][13][14][15][16][17][18].…”