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Cationic Polymerization - DOAJ

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Last Updated: 02 August 2022

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Synthesis of well-defined bisbenzoin end-functionalized poly(ε-caprolactone) macrophotoinitiator by combination of ROP and click chemistry and its use in the synthesis of star copolymers by photoinduced free radical promoted cationic polymerization

A new well-defined bisbenzoin group end-functionalized poly macrophotoinitiator was synthesized by a combination of ring opening polymerization and click chemistry. By Cu catalysis, the click reaction between PCL-2 and PI-alkyne was observed in thene. Poly with bisbenzoin photoactive functional group at the chain's end was found by spectroscopic analysis, with controlled chain length and low-polydispersity. This PCL-2 macrophotoinitiator was used as a precursor to photoinduced free radical polymerization to produce an AB2-type miktoarm star copolymer made up of poly and poly, namely PCL2.

Source link: https://doi.org/10.1080/15685551.2016.1231041


Synthesis of Poly(cyclohexene oxide)-Montmorillonite Nanocomposite via In Situ Photoinitiated Cationic Polymerization with Bifunctional Clay

Poly /clay nanocomposites were prepared by means of in situ photoinitiated cationic polymerization with initiator moieties immobilized within the clay particles' silicate galleries. The molecules of diphenyliodonium were intercalated during the cation exchange process between Cloisite Ca and diphenyliodonium. The polymerization of CHO within the clay's interlayer galleries can ensure a uniform distribution of the clay layers in the polymer matrix in nanosize and results in the formation of PCHO/clay nanocomposites.

Source link: https://doi.org/10.1155/2013/617498


Curing Behavior, Rheological, and Thermal Properties of DGEBA Modified with Synthesized BPA/PEG Hyperbranched Epoxy after Their Photo-Initiated Cationic Polymerization

This paper examines the photo-initiated cationic polymerization of diglycidyl ether of bisphenol A modified with bisphenol A/polyethylene glycol hyperbranched epoxy resin. The addition of the hyperbranched epoxy resin has been shown to increase UV conversion and reduce gelation time. In turn, the glass transition temperature decreased, and UV intensity increased at the same time, owing to the difference in crosslinking points' molecular weight. It is noted that the higher the M c is, the greater the radius of gyration will be, resulting in low glass transition temperature.

Source link: https://doi.org/10.3390/polym12102240


Statistical Copolymers of n -Butyl Vinyl Ether and 2-Chloroethyl Vinyl Ether via Metallocene-Mediated Cationic Polymerization. A Scaffold for the Synthesis of Graft Copolymers

As an initiating scheme, the cationic statistical copolymerization of n-butyl and 2-chloroethyl vinyl ether is done with a tetrakisborate dimethylanilinum salt [Me 2 NHPh] + [Me 2 NHPh] is as a process. Structural parameters of the copolymers are determined by determining the dyad sequence fractions and the mean sequence length, which are derived using monomer reactivity ratios. The statistical copolymers are now employed as scaffolds for the synthesis of graft copolymers with polys as a backbone and either poly or poly as side chains.

Source link: https://doi.org/10.3390/polym11091510


Characteristics and Mechanism of Vinyl Ether Cationic Polymerization in Aqueous Media Initiated by Alcohol/B(C6F5)3/Et2O

For the first time by a CumOH/B3/Et2O initiating process in an air atmosphere, Aqueous cationic polymerizations of vinyl ethers were carried out by a CumOH/B3/Et2O initiating device in an air atmosphere. The polymerization rate in aqueous media using B3/Et2O as a co-initiator decreases as the temperature is reduced, making the significant difference with traditional cationic polymerization. For providing a theoretical basis, a density functional theory was used to investigate the relationship between H2O and alcohol in conjunction with B3's investigation.

Source link: https://doi.org/10.3390/polym11030500


Aspects of the Synthesis of Poly(styrene- block -isobutylene- block -styrene) by TiCl 4 -Co-initiated Cationic Polymerization in Open Conditions

In open conditions, the cationic polymerization of isobutylene and its block copolymerization with styrene is investigated using the DiCl/TiCl 4 /2,6-lutidine initiating process. The synthesis of poly triblock copolymer in open conditions necessitated the addition of proton trap in two steps, half at the start of the reaction, and the second half together with styrene. A series of triblock copolymers with different lengths of central polyisobutylene block and side polystyrene blocks with low polydispersity were synthesized following this protocol.

Source link: https://doi.org/10.3390/macromol1040017


Microwave Assisted Cationic Polymerization of Different Type Palm Oils with Boron Trifluoride Ethereal Catalyst

Indonesia is a major palm oil producer. However, more than 76% of the production is exported as crude palm oil with low economic values, despite the fact that low economic values are exported. crude palm oil, refined-bleached deodorized palm oil, and refined bleached deodorized palm oil olein were converted under microwave-assisted cationic polymerization with the boron trifluoride ethereal catalyst in this study. The raw material compositions, iodine values, and functional groups of the raw material and polymers were investigated by gas chromatography, titrimetry, and Fourier Transform infrared spectrophotometry, respectively. The iodine content of the resulting polymer compounds was lower than the raw materials, indicating the decrease of C=C bonds due to the polymerization of the C=C bonds. The product is a thermoplastic polymer with a melting point ranging from 40. 3 to 45. 2 °C; and the freezing point of 28. 1 °C. U00b0C: The DSC thermogram curve established that the product is a thermoplastic polymer with a melting point ranging from 40. 3 to 45. 2 °C; and the freezing point from 22. 5 to 28. 1 °C.

Source link: https://doi.org/10.22146/ijc.26680


Electro-Optical Properties of a Polymer Dispersed and Stabilized Cholesteric Liquid Crystals System Constructed by a Stepwise UV-Initiated Radical/Cationic Polymerization

Polymer-dispersed liquid crystal and polymer-stabilized liquid crystal are two common liquid crystal/polymer composites. PDLCs are normally produced by dispersing LC droplets in a polymer matrix, while PSLC is a procedure in which the alignment of LC molecules is maintained by interactions between the polymer network and the LC molecules is stabilized. paraphrase isotropic acrylate monomer and a cholesteric liquid crystal monomer were added to a mixture containing a liquid-crystalline vinyl monomer in this new material technology. The PD&SChLC architecture was built using a stepwise UV-initiated polymerization, based on the different reaction rates between LVM and IAM. The mixture was irradiated with UV light for a brief period of time during the manufacturing of the PDS&ChLC films, first initiating the free radical polymerization of IAMs, resulting in a phase-separated microstructure, PDLC.

Source link: https://doi.org/10.3390/cryst9060282


Coumarins as Powerful Photosensitizers for the Cationic Polymerization of Epoxy-Silicones under Near-UV and Visible Light and Applications for 3D Printing Technology

When mixed with 4-isopropyl-4-3'u2019-methyldiphenylioborate, eight coumarins are suggested as near-UV and blue light sensitive photoinitiators/photosensitizers for epoxysilicone synthesis. This paper focuses on the comparison of the latest suggested coumarins with well-established photoensitizers, e. g. , 1-chloro-4-propoxythioxanthone, 9,10-dibutoxyanthracene, or other commercial coumarins. The latest cationic 3D printing machines were also used for laser write experiments on irradiation with a laser diode at 405 nm in order to produce new cationic 3D printing devices, as an example of their high success.

Source link: https://doi.org/10.3390/molecules25092063


Naturally-Derived Amphiphilic Polystyrenes Prepared by Aqueous Controlled/Living Cationic Polymerization and Copolymerization of Vinylguaiacol with R–OH/BF 3 ·OEt 2

The Ru207bOH/BF3 initiating process, which is effective in the controlled/living polymerization of 4-VG in the presence of a large amount of water, was initiated by reversible activation of terminal Cu207bOH bond catalyzed by BF 3 ogglet 2, resulting in the polymers with controlled molecular weights and narrow molecular weight distributions in the presence of controlled/living polymerization of petroleum-de u00b7OEt2 initiating system, BF 2 initiating system, BF 3 u3 o het 2 catiovidu00b7omo graft2 hexot2 bOH u206bho rogylphenol molylphenol BF 2 BF3 BF 3 u201b5 b7OEt 2 et 2 mol graft 2 molt 2 u00b7oylphenolt 2 hehet2 molot 2 edylphenol m3 o The random or block copolymerization of 4VG was also investigated using p-methoxystyrene as a comonomer with an aqueous initiating system to adjust the amphiphilic properties of the 4VG-derived phenolic polymers' amphiphilic characteristics.

Source link: https://doi.org/10.3390/polym10121404

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions