Chemical modification of poly(vinylacetylene) via click reaction

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Qing Fengling ◽  
Yao Rongxing ◽  
Wang Lianjun ◽  
Li Hongqi ◽  
Meng Weidong
Keyword(s):  
Chemical Modification ◽  
Click Reaction ◽  
Terminal Alkynes ◽  
Click Reactions ◽  
Molecular Weights ◽  
H Nmr ◽  
Good Solubility ◽  
Alkyl Groups ◽  
Structures And Properties ◽  
Ft Ir

AbstractChemical modification of poly(vinylacetylene) (PVacet) was performed through click reactions by which alkyl and fluoroalkyl groups were introduced to the pendent terminal alkynes of PVacet. Novel polymers containing 1,2,3-triazoles were consequently obtained and their structures and properties were characterized by FT-IR, 1H NMR, TGA, DSC and GPC. The polymers modified by alkyl groups had good solubility, thermal stability and reasonable molecular weights. It was also demonstrated that the properties of fluorine-containing polymers were affected by fluorine atoms with hydrophobic and chemical proof properties

scholarly journals SYNTHESIS OF AN AZIDE–THIOL LINKER FOR HETEROGENEOUS POLYMER FUNCTIONALIZATION VIA THE “CLICK” REACTION

2018 ◽  
Vol 55 (1B) ◽  
pp. 152
Author(s):  
Thuy Thu Truong
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Click Reaction ◽  
Proton Nuclear Magnetic Resonance ◽  
Reaction Yield ◽  
Reaction Conditions ◽  
Click Reactions ◽  
Heterogeneous Polymer ◽  
Ft Ir ◽  
First Time ◽  
Layer Chromatography

In this study, the synthesis of a telechelic linker bearing both azide and thiol functional groups was described. The reaction conditions were investigated to optimize the reaction yield. The product was analyzed using thin layer chromatography (TLC) and proton nuclear magnetic resonance (1H NMR). The employment of the obtained azide–thiol linker in heterogeneous polymer “click” functionalization was demonstrated for the first time, which was monitored by an online FT–IR method. The obtained telechelic azide–thiol linker is envisioned to be useful chemical tools to link macromolecular chains via orthogonal click reactions.

The Synthesis and Crystallization of Poly(vinylidene fluoride) in Supercritical CO2

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
Zhendong Shi ◽  
Zhen Zheng ◽  
Xiaoli Su ◽  
Xinling Wang
Keyword(s):  
Vinylidene Fluoride ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Molecular Weights ◽  
Good Solubility ◽  
Poly Vinylidene Fluoride ◽  
Ft Ir ◽  
Application Fields ◽  
Crystallization Mode

AbstractA series of poly(vinylidene fluoride)s (PVDFs) is synthesized in supercritical carbon dioxide (sc-CO2). The influences of polymerization pressure, molecular weight distribution and H-H defect concentration on the crystallization of PVDF have been studied in combination with differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXRD) and Fourier transform infrared spectroscopy (FT-IR) measurements. The result shows that the morphology, molecular weights, polydispersity and head-to-head (H-H) defect concentrations of the PVDFs are affected by the reaction pressure and good solubility generated from sc-CO2. Especially, the sc-CO2 polymerization has greatly improved the crystallization mode of the obtained PVDFs such as the complete degree of crystallinity, crystallinity and the crystal phase. This will create more comprehensive application fields for PVDF.

scholarly journals Mild Covalent Functionalization of Transition Metal Dichalcogenides with Maleimides: A “Click” Reaction for TMDCs

2018 ◽  
Author(s):  
Mariano Vera-Hidalgo ◽  
Emerson Giovanelli ◽  
Cristina Navío ◽  
Emilio Pérez
Keyword(s):  
Transition Metal ◽  
Chemical Modification ◽  
Biomedical Applications ◽  
Click Reaction ◽  
Transition Metal Dichalcogenides ◽  
Polymer Chemistry ◽  
Covalent Functionalization ◽  
Click Reactions ◽  
Mild Conditions ◽  
Metal Dichalcogenides

The physical properties of ultrathin transition metal dichalcogenides (2D-TMDCs) make them promising candidates as active nanomaterials for catalysis, optoelectronics, and biomedical applications. Chemical modification of TMDCs is expected to be key in modifying/adding new functions that will help make such promise a reality. We present a mild method for the modification of the basal planes of 2H-MoS<sub>2</sub> and WS<sub>2</sub>. We exploit the soft nucleophilicity of sulfur to react it with maleimide derivatives, achieving covalent functionalization of 2H-TMDCs under very mild conditions. Extensive characterization proves that the reaction occurs through Michael addition. Our results adapt one of the most popular “click” reactions in polymer chemistry and biochemistry to obtain a powerful tool for the chemical manipulation of TMDCs.

Preparation and Characterization of Poly(lactic acid) with Different Molecular Weights by Thermal Hydrolysis

2013 ◽  
Vol 440 ◽  
pp. 19-24 ◽  
Author(s):  
Jun Yan Yao ◽  
Loogn Tak Lim ◽  
Yu Jie Li
Keyword(s):  
Molecular Weight ◽  
Lactic Acid ◽  
Hydroxyl Group ◽  
Poly Lactic Acid ◽  
Thermal Hydrolysis ◽  
Molecular Weights ◽  
Hydrolytic Reaction ◽  
Structures And Properties ◽  
Ft Ir

A feasible and effective method of thermal hydrolysis to prepare poly (lactic acid) (PLA) oligomers with different controlled molecular weight from PLA is presented in this paper. The thermal hydrolytic reaction was carried out by immerging PLA resin pellets in boiling distilled water for a certain period of time. Ester groups in PLA chains are hydrolytically degraded in the presence of water and thermal, so PLA oligomers with different molecular weight were prepared. The structures and properties of PLA oligomers were characterized by FT-IR, GPC, DSC, etc. The results showed that thermal hydrolytic reaction could effectively reduce the molecular weight of PLA, which declines with the increase of the thermal hydrolytic reaction time. Meanwhile, the content of terminal hydroxyl group, glass transition temperature, melting point of PLA oligomers prepared from thermal hydrolytic reactions exhibit gradual changes with the extension of the thermal hydrolytic time.

scholarly journals Synthesis of Tert-Octylsalicylaldoxime and Its Application in Extraction of Cu(II)

2021 ◽  
Vol 9 ◽  
Author(s):  
Liqing Li ◽  
Luo Feng ◽  
Chunfa Liao ◽  
Fangxu Li ◽  
Liqin Yang
Keyword(s):  
Elemental Analysis ◽  
Extraction Ability ◽  
One Pot ◽  
H Nmr ◽  
Alkyl Groups ◽  
Ft Ir ◽  
Copper Nickel Alloy ◽  
The One ◽  
Yield And Purity ◽  
C Nmr

The alkyl salicylaldoxime has attracted more and more attention recently due to the complex branched alkyl groups. In this study, a novel alkyl salicylaldoxime, tert-octylsalicylaldoxime, was successfully synthesized by the one-pot method. The yield and purity by the elemental analysis were 96.17 and 94.13%, respectively. The structure was confirmed by elemental analysis, FT-IR, 1H NMR (Nuclear Magnetic Resonance), 13C NMR spectroscopy, and MS. Results showed that tert-octylsalicylaldoxime with a new structure exhibited excellent extraction ability and selectivity for Cu(II) and can be successfully used to recover Cu from copper-nickel alloy electroplating wastewater. Thus, this product has the potential to be used as a powerful copper extractant in the future.

Sulfur-containing polyurethanes as novel macro photoinitiators comprising in-chain benzophenone and coinitiator amine for photopolymerization

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Jun Wei ◽  
Rong Lu ◽  
Jun Qiu ◽  
Fang Liu
Keyword(s):  
Macromolecular Structure ◽  
Low Molecular Weight ◽  
Isophorone Diisocyanate ◽  
Scanning Calorimetry ◽  
H Nmr ◽  
Structures And Properties ◽  
Trimethylolpropane Triacrylate ◽  
Ft Ir ◽  
Dsc Analyses ◽  
Sulfur Containing

AbstractThree novel sulfur-containing polyurethanes (PUs) as macrophotoinitiators, hydroxyl-terminated PUa and PUb, and amino-terminated PUc, were synthesized through polycondensation of a novel diamine 4,4’-bis[(4- amino)thiophenyl]benzophenone (BATPBP), isophorone diisocyanate (IPDI) and N-methyldiethanolamine (MDEA). The beznophenone and coinitiator amine structures were successfully introduced into the backbones of PUs. FT-IR, 1H NMR, GPC and DSC analyses confirmed their structures and properties. UV-vis spectra indicate that the macromolecular structure nearly has no influence on their UV-vis absorptions. A trifunctional monomer of trimethylolpropane triacrylate (TMPTA), initiated by these macrophotoinitiators with a low-molecular-weight photoinitiator system (benzophenone/MDEA) as the reference, was studied through photo differential scanning calorimetry (photo-DSC). The results show PUa is the most efficient photoinitiator and the molar content of coinitiator amine in PUs has an important effect on their photoefficiency.

scholarly journals Synthesis, Characterization and Heavy Metal Ion Adsorption Behavior of Imidazole-Based Novel Polyamides and Polyimides

2017 ◽  
Vol 61 (3) ◽  
Author(s):  
Bita Soleimani ◽  
Mehdi Taghavi ◽  
Mousa Ghaemy
Keyword(s):  
Heavy Metal ◽  
Metal Ion ◽  
Ion Adsorption ◽  
H Nmr ◽  
Good Solubility ◽  
Metal Ion Adsorption ◽  
Nmr Techniques ◽  
Ft Ir ◽  
Aromatic Heterocyclic ◽  
C Nmr

Imidazole-based polyamides (PA)s and polyimides (PI) s were prepared from condensation of a new aromatic heterocyclic diamine, 4,4›(4,4›-(2-(4-(triflouromethyl)phenyl)-1H-imidazole-4,5-dyl)bis(4,1-phenylen))bis(oxy)bis(3-(4,5-diphenyl-1H-imidazole-2-yl)aniline), with various diacids and dianhydrides, respectively. The structure of diamine, PAs and PIs were fully characterized by using elemental analysis, FT-IR, <sup>1</sup>H NMR and <sup>13</sup>C NMR techniques. Also, adsorption capability of these polymers for removal of heavy metal ions such as Co<sup>2+</sup>, Cr<sup>3+</sup>, Cd<sup>2+</sup>, Hg<sup>2+</sup> and Pb<sup>2+</sup> from aqueous solutions was also tested at pH 7-8. The PAs and PIs showed good solubility in aprotic polar organic solvents with high thermal stability exhibiting the glass transition temperatures (T<sub>g</sub>)s and 10% weight loss temperatures (T<sub>10</sub>%) in the range of 220-286 °C and 383-435 °C for PAs and 251-307 °C and 407-512 °C for PIs.

scholarly journals A Study on Copolymer Systems of Styrene with Diethanolamine Side Group and Methyl Methacrylate

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Aslisah Acikses ◽  
Gokce Taskan ◽  
Gamze Barim
Keyword(s):  
Methyl Methacrylate ◽  
Loss Factor ◽  
Bromocresol Green ◽  
Impedance Analyzer ◽  
Molecular Weights ◽  
H Nmr ◽  
Thermal Decomposition Behavior ◽  
Ft Ir ◽  
Decomposition Behavior ◽  
Polymerization Method

4-Diethanolaminomethyl styrene (DEAMSt) monomer was prepared by the modification of 4-chloromethyl styrene with diethanolamine. The copolymers in different combinations (0.11, 0.19, and 0.30 by mole) of DEAMSt and methyl methacrylate (MMA) were prepared by free radical polymerization method at 60°C in the presence of 1,4-dioxane and AIBN as initiator. The structures of DEAMSt and DEAMSt-MMA copolymer were characterized by FT-IR and 1H-NMR. The glass transition temperature (Tg) of the copolymers was measured by DSC. Thermal decomposition behavior of the copolymers was investigated by TGA. The average molecular weights of the copolymers were determined by GPC. The dye uptaking properties of the copolymers were investigated using bromocresol green. Then, the dielectric constant, dielectric loss factor, and conductivity of copolymers were investigated as a function of temperature and frequency. The activation energies (Ea) of the copolymers were determined by impedance analyzer.

Photophysical and photochemical properties of novel phthalocyanines bearing non-peripherally substituted mercaptoquinoline moiety

2012 ◽  
Vol 16 (07n08) ◽  
pp. 845-854 ◽  
Author(s):  
Göknur Yaşa ◽  
Ali Erdoğmuş ◽  
Ahmet Lütfi Uğur ◽  
M. Kasım Şener ◽  
Ulvi Avcıata ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Electronic Spectroscopy ◽  
Quantum Yields ◽  
Solubility In Water ◽  
Fluorescence Quantum Yields ◽  
H Nmr ◽  
Good Solubility ◽  
Ft Ir ◽  
Photochemical Properties ◽  
First Time

The synthesis, photophysical and photochemical properties of nonperipherally (α) mercaptoquinoline substituted Zn(II) , TiO(IV) and Mg(II) and quaternized Zn(II) phthalocyanines are described for the first time. These complexes (2 to 5) and their precursor are characterized by elemental analysis, FT-IR, 1H NMR, electronic spectroscopy as well as mass spectroscopy. Complexes 2, 4 and 5 have good solubility in organic solvents such as CHCl3 , DCM, DMSO, DMF, THF and toluene and are not aggregated in all solvents within a wide concentration range. Complex 3 showed very good solubility in water as well as DMSO and DMF. General trends are described for singlet oxygen, photodegradation and fluorescence quantum yields of these complexes in DMSO and DMF. While complex 2 has higher singlet oxygen and fluorescence quantum yields than 3, 4 and 5, complex 4 has higher fluorescence quantum yields in DMF and DMSO than 2, 3 and 5. The effect of the solvents and metal on the photophysical and photochemical parameters of the metallophthalocyanines are also reported.

Synthesis and Properties of Cellulose Diacetate Graft Poly(p-dioxanone) Copolymers via the Couple-Grafting Copolymerization

2012 ◽  
Vol 549 ◽  
pp. 3-7
Author(s):  
Jiang Zhu ◽  
Xiu Li Wang
Keyword(s):  
Mechanical Properties ◽  
Isocyanate Group ◽  
Hydroxyl Groups ◽  
Cellulose Diacetate ◽  
Molecular Weights ◽  
H Nmr ◽  
Biodegradable Copolymer ◽  
Ft Ir ◽  
Grafting Copolymerization ◽  
Grafting Procedure

A new biodegradable copolymer of cellulose diacetate and poly(p-dioxanone) (PPDO) was prepared through a couple-grafting procedure. PPDO was functionalized with the isocyanate group, and then PPDO terminated with the isocyanate group was enabled to react with the hydroxyl groups of cellulose diacetate. The length of PPDO graft chains can be controlled easily by using the prepolymers of PPDO with different molecular weights. The resulting products were thoroughly characterized with FT-IR,1H-NMR. The mechanical properties of the copolymers were affected greatly by the length of PPDO segment.

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