Recent developments in the synthesis of functional poly(olefin)s

Yanjarappa, Mallinamadugu J.; Sivaram, Swaminathan

doi:10.1016/s0079-6700(02)00011-4

Cited by 180 publications

(116 citation statements)

References 181 publications

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“…After the reaction the vial was cooled down to room temperature, and a sample was taken to measure the conversion using 1 H NMR spectroscopy and to measure the molecular weight distribution using SEC. The reaction mixture was quenched with methanol, washed three times with methanol, and dried under vacuum, which yielded the pure polymers.…”

mentioning

confidence: 99%

Block Copolymers of “PE-Like” Poly(pentadecalactone) and Poly(l-lactide): Synthesis, Properties, and Compatibilization of Polyethylene/Poly(l-lactide) Blends

et al. 2015

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Block copolymers consisting of a polyethylene block and a polar polymer block are interesting structures for the compatibilization of polyethylene/polar polymer blends or polyethylene-based composites. Since the synthesis of polyethylene-based block copolymers is an elaborate process, diblock copolymers consisting of “polyethylene-like” poly(pentadecalactone) (PPDL) and poly(l-lactide) (PLLA) were synthesized using a one-pot, sequential-feed ring-opening polymerization of pentadecalactone (PDL) and l-lactide (LLA). The peculiar activity of the used aluminum salen catalysts yielded a block copolymer consisting of two blocks with both a high dispersity, as a result of intrablock transesterification. Interestingly, interblock transesterification was effectively suppressed. The obtained poly(PDL-block-LLA) of various block lengths showed coincidental crystallization of the two blocks with an associated microphase-separated morphology, in which PLLA spheres with a high dispersity are distributed within the PPDL matrix. The complex morphologies is believed to arise from the presence of a whole range of block sizes as a consequence of the large dispersity of both blocks. The application of these block copolymers as compatibilizers for high density polyethylene (HDPE)/PLLA blends led to a clear change in blend morphology and a steep decrease in particle size of the dispersed phase. Furthermore, addition of the block copolymers to blends of linear low density polyethylene (LLDPE) and PLLA led to a significant increase in adhesion between the two phases. For both HDPE/PLLA and LLDPE/PLLA blends, the compatibilization efficiency of the poly(PDL-block-LLA) increased when the length of the PPDL block was increased. The presented results clearly show that PPDL can function as a substituent for various types of polyethylene, which opens up a new method for compatibilizing polyethylene with polar polymers using easy attainable “PE-like” block copolymers.

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confidence: 99%

Block Copolymers of “PE-Like” Poly(pentadecalactone) and Poly(l-lactide): Synthesis, Properties, and Compatibilization of Polyethylene/Poly(l-lactide) Blends

et al. 2015

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“…It can be seen from Table 1 that the viscosity of the PAO oil sample mixed with antioxidants was slightly greater than PAO base oil, which may be due to the steric structure of the antioxidant dissolved increasing the flow resistance of the lubricating oil [9][10][11]. Enhancing the temperature, the viscosity of the PAO base oil decreased gradually, what's more, when the temperature rose to above 230 o C it declined sharply.…”

Section: Changes Of Kinematic Viscosity and Acid Value Of The Oil Samplementioning

confidence: 94%

Studies on Thermal Oxidation Stability of Aviation Lubricating Oils

Zong

Fei³

2017

MATEC Web Conf.

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Abstract.Simulating the operating condition of aviation engine via autoclave experiment of high temperature and pressure, we studied the physic-chemical property of poly-α-olefin base oil samples mixed with antioxidants of 2,6-di-tert-butyl-4-methylphenol and p,p'-diisooctyl diphenylamine at different temperature. The mechanism of degradation of PAO aviation lubricating oil was analyzed according to the oxidized products by modern analytical instruments. The results showed that the aviation lubricating oil produced a large number of low molecule compounds while increasing the temperature, and resulted in the viscosity decreasing and acid value increasing which indicated that the thermal oxidation of the oil sample underwent a radical process.

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“…The presence of functional groups on the polyolefin chains gives non-polar polyolefins enhanced properties, such as stiffness, toughness, adhesiveness, hydrophilicity, barrier properties and compatibility with other polar polymers. [1][2][3] One topic of interest in this area is the development of polyolefin-based block and graft copolymers linked between polyolefin and polar segments (e.g., polystyrene and poly(meth)acrylates). [4][5][6][7][8] Although each constituting polymer segment in such copolymers is generally immiscible, a covalent chemical linkage between them is expected to realize novel value-added polyolefin materials with a variety of bulk microstructures giving rise to thermoplastic elastomers, compatibilizers and impact modifiers.…”

Section: Introductionmentioning

confidence: 99%

Controlled radical polymerization with polyolefin macroinitiator: a convenient and versatile approach to polyolefin-based block and graft copolymers

et al. 2014

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---------(Abstract)This paper introduces the new synthetic methodology of polyolefin-based block and graft copolymers with polar segments (e.g., polystyrene and poly(meth)acrylates). Various brominated polyolefins were prepared by bromination of polyolefins with N-bromosccinimide. The resulting brominated polyolefins were able to initiate the controlled radical polymerization of polar monomers, such as methyl methacrylate, ethyl acrylate, t-butyl acrylate, styrene and 2-(dimethylamino)ethyl acrylate, by using a CuBr / N, N, N', N'', N''-pentamethyldiethylenetriamine catalyst system, leading to a variety of polyolefin-based copolymers with a different content of the corresponding polar segment. Because of the accessible synthesis of polyolefin macroinitiators, this synthetic methodology is expected to result in the preparation of a wide range of polyolefin-based block and graft copolymers.

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Recent developments in the synthesis of functional poly(olefin)s

Cited by 180 publications

References 181 publications

Block Copolymers of “PE-Like” Poly(pentadecalactone) and Poly(l-lactide): Synthesis, Properties, and Compatibilization of Polyethylene/Poly(l-lactide) Blends

Block Copolymers of “PE-Like” Poly(pentadecalactone) and Poly(l-lactide): Synthesis, Properties, and Compatibilization of Polyethylene/Poly(l-lactide) Blends

Studies on Thermal Oxidation Stability of Aviation Lubricating Oils

Controlled radical polymerization with polyolefin macroinitiator: a convenient and versatile approach to polyolefin-based block and graft copolymers

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