The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform

Fengling Qing - One of the best experts on this subject based on the ideXlab platform.

  • synthesis and repellent properties of vinylidene fluoride containing Polyacrylates
    Journal of Fluorine Chemistry, 2007
    Co-Authors: Jiqing Huang, Weidong Meng, Fengling Qing
    Abstract:

    Abstract Fluorinated polyacrylats with side group containing vinylidene fluoride (VDF) units (CF 3 (CF 2 ) n (CH 2 CF 2 ) m , n  = 3, 5; m  = 1, 2) were successfully synthesized. The water and oil repellency properties of these polymers are similar to those of fluorinated polyacrylate with side group containing long perfluorooctyl group (CF 3 (CF 2 ) 7 ). The thermal telomerization of CF 3 (CF 2 ) 5 I and CF 3 (CF 2 ) 3 I with vinylidene fluoride (VDF) provided CF 3 (CF 2 ) 5 CH 2 CF 2 I ( 1b ) and CF 3 (CF 2 ) 3 CH 2 CF 2 CH 2 CF 2 I ( 1c ), respectively. The addition of 1b with ethylene followed by hydrolysis gave CF 3 (CF 2 ) 5 CH 2 CF 2 CH 2 CH 2 OH ( 2b ). Treatment of 1c with ethyl vinyl ether in the presence of Na 2 S 2 O 4 followed by reduction produced CF 3 (CF 2 ) 3 CH 2 CF 2 CH 2 CF 2 CH 2 CH 2 OH ( 2c ). Fluoroacrylates 3b – d were prepared by acrylation of the corresponding fluoroalcohols 2b – d . The semi-continuous process emulsion co-polymerization of 3a – d with octadecyl acrylate and 2-hydroxylethyl acrylate initiated by (NH 4 ) 2 S 2 O 8 in the presence of a mixture emulsifiers of polyoxyethylene(10)nonyl phenyl ether (TX-10) and sodium lauryl sulfate provided stable latexes 4a – d , respectively. The water and oil repellency properties of 4b (R f : CF 3 (CF 2 ) 5 CH 2 CF 2 ) and 4c (R f : CF 3 (CF 2 ) 3 CH 2 CF 2 CH 2 CF 2 ) containing vinylidene fluoride (VDF) units were similar to those of 4a (R f : CF 3 (CF 2 ) 7 ) containing long perfluoroalkyl group and much better than those of polymer 4d (R f : CF 3 (CF 2 ) 3 ) with short perfluoroalkyl chain. Thus, Polyacrylates containing vinylidene fluoride units showed promising aspects as the alternatives to the currently used water and oil repellent agents with long perfluoroalkyl chains.

Rathanawan Magaraphan - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis, characterization and degradation behavior of admicelled polyacrylate-natural rubber
    Materials Chemistry and Physics, 2015
    Co-Authors: Angkana Pongpilaipruet, Rathanawan Magaraphan
    Abstract:

    In order to improve weatherability of the cured natural rubber, the novel introduction of good ozone resistant polymers such as Polyacrylates (poly(methyl acrylate) (PMA) or poly(methyl methacrylate) (PMMA)) into natural rubber (NR) by admicellar polymerization was investigated in this work. The admicellar polymerization to synthesize polyacrylate layer over the surface of NR latex particles was performed with varying monomer type (PMA and PMMA) and content (50 and 100 mM). The admicelled PMMA showed higher molecular weight than PMA. Fourier transform infrared spectra of the admicellar synthesized natural rubbers exhibited characteristic peaks of those Polyacrylates. Micrographs from transmission electron and field emission scanning electron microscopes (FE-SEM) revealed the coatings of PMA and PMMA over the rubber particles, suggesting a core-shell structure. Thermogravimetric analysis revealed that the admicelled rubbers not only showed an improvement in heat stability but also a single decomposition temperature. After vulcanization, FE-SEM results showed the cured admicelled rubbers had phase transformation from core-shell to phase separation (aggregate domains of polyacrylate-rich phase) with smooth interface. This agreed well to their one glass transition temperature (∼-48 °C) which indicated good miscibility between NR and each polyacrylate. The cracks generated after exposure to ozone found in the admicelled rubbers were smaller than those in NR, suggesting better ozone resistance was achieved. Increasing monomer concentration led to less cracks or much better ozone resistance. Furthermore, changes in mechanical properties after ozone exposure of the admicelled PMA-NR were less than those of the admicelled PMMA-NR (having the same shell content) and the NR, respectively.

Konrad Noniewicz - One of the best experts on this subject based on the ideXlab platform.

  • Polyarylates as nonlinear optics materials
    Reactive & Functional Polymers, 1997
    Co-Authors: Konrad Noniewicz, Zbigniew K. Brzozowski
    Abstract:

    Abstract Several polyarylates based on UV sensitive bisbenzylidenoketones for use as potential second-order nonlinear optical (NLO) materials have been obtained by interfacial polycondensation. The polymers investigated can be divided into two groups: guest-host systems and polyarylates with NLO side-chains. The electro-optic (EO) coefficient, r 33 , was measured in the Pockels experiment. UV crosslinking was applied to increase NLO stability of the investigated materials. Loss and time relaxation of EO coefficient for crosslinked and noncrosslinked polyarylates were also measured.

  • UV-Sensitive Polyarylates as Photoresist and Nonlinear Optics Materials
    Journal of Macromolecular Science Part A, 1995
    Co-Authors: Zbigniew K. Brzozowski, Konrad Noniewicz
    Abstract:

    Abstract New UV-sensitive polyarylates derived from UV-sensitive and UV-insensitive bisphenols and phthaloyl chlorides are described. It has been found that the polyarylates from bis(3-ethoxy-4-hydroxybenzylidene) acetone and bis(4hydroxyphenyl)dichloroethylene have in particular superior properties. Other UV-sensitive polyarylates based on 2,2-bis(3-allyl-4-hydroxyphenyl)propane and isophthaloyl chloride have also been developed. The main requirements for photoresists are fulfilled by these latter materials. These polyarylates have undergone preliminary tests to explore their uses in non-linear optics.

Zbigniew K. Brzozowski - One of the best experts on this subject based on the ideXlab platform.

  • Polyarylates as nonlinear optics materials
    Reactive & Functional Polymers, 1997
    Co-Authors: Konrad Noniewicz, Zbigniew K. Brzozowski
    Abstract:

    Abstract Several polyarylates based on UV sensitive bisbenzylidenoketones for use as potential second-order nonlinear optical (NLO) materials have been obtained by interfacial polycondensation. The polymers investigated can be divided into two groups: guest-host systems and polyarylates with NLO side-chains. The electro-optic (EO) coefficient, r 33 , was measured in the Pockels experiment. UV crosslinking was applied to increase NLO stability of the investigated materials. Loss and time relaxation of EO coefficient for crosslinked and noncrosslinked polyarylates were also measured.

  • UV-Sensitive Polyarylates as Photoresist and Nonlinear Optics Materials
    Journal of Macromolecular Science Part A, 1995
    Co-Authors: Zbigniew K. Brzozowski, Konrad Noniewicz
    Abstract:

    Abstract New UV-sensitive polyarylates derived from UV-sensitive and UV-insensitive bisphenols and phthaloyl chlorides are described. It has been found that the polyarylates from bis(3-ethoxy-4-hydroxybenzylidene) acetone and bis(4hydroxyphenyl)dichloroethylene have in particular superior properties. Other UV-sensitive polyarylates based on 2,2-bis(3-allyl-4-hydroxyphenyl)propane and isophthaloyl chloride have also been developed. The main requirements for photoresists are fulfilled by these latter materials. These polyarylates have undergone preliminary tests to explore their uses in non-linear optics.

L V Zhilitskaya - One of the best experts on this subject based on the ideXlab platform.

  • Polyacrylates of noble metals as potential antitumor drugs
    Biophysics, 2014
    Co-Authors: L A Ostrovskaya, M G Voronkov, D B Korman, M M Fomina, V A Rikova, K A Abzaeva, N V Bluhterova, L V Zhilitskaya
    Abstract:

    The antitumor activity of Polyacrylates of the noble metals containing argentum (argacryl), aurum (auracryl) and platinum (platacryl) has been studied using experimental murine solid tumor models (Lewis lung carcinoma and Acatol adenocarcinoma). It has been found that Polyacrylates of the noble metals are capable of inhibiting tumor development by 50–90% compared to control. Auracryl that inhibits the growth of Lewis lung carcinoma and Acatol adenocarcinoma by 80 and 90%, respectively, compared to control is the most efficient among the tested compounds and can be recommended for the further profound preclinical studies.

  • metal Polyacrylates ferrocene derivatives and polysuccinimide as potential antitumor drugs
    Russian Chemical Bulletin, 2014
    Co-Authors: L A Ostrovskaya, S D Varfolomeev, M G Voronkov, D B Korman, N V Bluchterova, M M Fomina, V A Rikova, V M Goldberg, K A Abzaeva, L V Zhilitskaya
    Abstract:

    Compounds belonging to three novel groups of oncological drugs (metal Polyacrylates, ferrocene derivatives, and polysuccinimide) showed antitumor activity. The most efficient compounds, viz., gold polyacrylate (auracryl), 2-[(1-ferrocenylethyl)sulfanyl]pyrimidine (LS-17), and polysuccinimide, inhibit the growth of murine solid tumors by 70–95% and are recommended for further thorough preclinical studies of their antitumor properties and mechanisms of action.