Improving stability of the metal-free primary energetic cyanuric triazide (CTA) through cocrystallization

2020 ◽  
Vol 56 (14) ◽  
pp. 2111-2114 ◽  
Author(s):  
Leila M. Foroughi ◽  
Ren A. Wiscons ◽  
Derek R. Du Bois ◽  
Adam J. Matzger
Keyword(s):  
Thermal Properties ◽  
Metal Free

Cyanuric triazide and benzotrifuroxan (BTF) form a metal-free primary energetic cocrystal with suppressed volatility and improved thermal properties relative to CTA.

Recent advances in graphitic carbon nitride as catalyst for heterogeneous Fenton-like reaction

2021 ◽  
Author(s):  
Jia Fei ◽  
Xin Peng ◽  
Longbo Jiang ◽  
Xingzhong Yuan ◽  
Xiangyan Chen ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Heterogeneous Fenton ◽  
Metal Free ◽  
Recent Advances ◽  
Stable Chemical ◽  
Structural Regulation

Graphitic carbon nitride (g-C3N4), an appealing metal-free polymer has gained extensive research in heterogeneous Fenton-like reactions owing to its advantages of stable chemical and thermal properties, easy of structural regulation...

scholarly journals 1,3-Dioxolan-4-Ones as Promising Monomers for Aliphatic Polyesters: Metal-Free, in Bulk Preparation of PLA

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2396
Author(s):  
Stefano Gazzotti ◽  
Marco Aldo Ortenzi ◽  
Hermes Farina ◽  
Alessandra Silvani
Keyword(s):  
Molecular Weight ◽  
Thermal Properties ◽  
Acid Catalyst ◽  
Monomer Conversion ◽  
Reaction Conditions ◽  
Aliphatic Polyesters ◽  
Metal Free ◽  
Weight Growth ◽  
Double Activation

The first example of solvent-free, organocatalyzed, polymerization of 1,3-dioxolan-4-ones, used as easily accessible monomers for the synthesis of polylactic acid (PLA), is described here. An optimization of reaction conditions was carried out, with p-toluensulfonic acid emerging as the most efficient Brønsted acid catalyst. The reactivity of the monomers in the tested conditions was studied following the monomer conversion by 1H NMR and the molecular weight growth by SEC analysis. A double activation polymerization mechanism was proposed, pointing out the key role of the acid catalyst. The formation of acetal bridges was demonstrated, to different extents depending on the nature of the aldehyde or ketone employed for lactic acid protection. The polymer shows complete retention of stereochemistry, as well as good thermal properties and good polydispersity, albeit modest molecular weight.

Synthesis and characterization of novel tetrakis (3-hydroxypropylmercapto)-substituted phthalocyanines

2013 ◽  
Vol 17 (06n07) ◽  
pp. 573-586 ◽  
Author(s):  
Çiğdem Yağcı ◽  
Ahmet Bilgin
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Synthesis And Characterization ◽  
The Novel ◽  
Scanning Calorimetry ◽  
Metal Free ◽  
Visible Spectra ◽  
Ft Ir ◽  
Aromatic Nitro

A phthalonitrile precursor 4-(3-hydroxypropylmercapto)phthalonitrile (3) was synthesized via a base-catalyzed nucleophilic aromatic nitro displacement of 4-nitrophthalonitrile with the 3-mercapto-1-propanol. A novel tetrasubstituted metal-free phthalocyanine (4) ( M = 2 H ) and its metal complexes (5–8) ( M = Zn , Ni , Cu and Co ) bearing 3-hydroxypropylmercapto moieties were prepared by the cyclotetramerization reaction of (3) with the appropriate materials. The visible spectra of the zinc(II) phthalocyanine (5) was recorded with different concentrations and different ions as Ag +, Hg 2+ and Pb 2+ in DMF and also with different solvents as dimethylformamide and pyridine. Fluorescence spectrum of the compound (5) was also studied. Temperature and frequency dependence of AC conductivity for (4–8) was investigated in air and under vacuum and were found to be ~10-8–10-5 S.m-1. Thermal properties of the phthalocyanines were examined by differential scanning calorimetry. All the novel compounds have been characterized by elemental analysis, UV-vis, FT-IR, NMR and MS spectral data and DSC techniques.

scholarly journals Fully Lignocellulose-Based PET Analogues for the Circular Economy

2021 ◽  
Author(s):  
Xianyuan Wu ◽  
Maxim Galkin ◽  
Zhuohua Sun ◽  
Katalin Barta
Keyword(s):  
Thermal Properties ◽  
Dicarboxylic Acid ◽  
Circular Economy ◽  
Terephthalic Acid ◽  
Methyl Esters ◽  
Woody Biomass ◽  
Environmental Concerns ◽  
Metal Free ◽  
Raney Ni ◽  
Excellent Chemical

Polyethylene terephthalate (PET) is one of the most abundantly used polymers, but also a significant pollutant in oceans. Due to growing environmental concerns, novel PET alternatives are highly sought after. Here we present readily recyclable PET analogues made entirely from woody biomass. Central to the concept is a two-step noble metal free catalytic sequence (Cu20-PMO catalyzed reductive catalytic fractionation and Raney Ni mediated catalytic funneling) that allows for obtaining a single aliphatic diol (PC) in 56.4% efficiency as well as other product streams convertible to fuels. The diol PC is co-polymerized with methyl esters of terephthalic acid (TPA) and furan dicarboxylic acid (FDCA), both of which can be derived from the cellulose residues, to obtain polyesters with competitive Mw and thermal properties (Tg of 70–90 °C). The new polymers show excellent chemical recyclability in methanol and are thus promising candidates for the circular economy.<br>

scholarly journals Regioselective synthesis of dipyrrolopyrazine (DPP) derivatives via metal free and metal catalyzed amination and investigation of their optical and thermal properties

RSC Advances ◽  
2017 ◽  
Vol 7 (29) ◽  
pp. 18120-18131 ◽  
Author(s):  
Puttavva Meti ◽  
Eun-Sil Lee ◽  
Jung-Won Yang ◽  
Young-Dae Gong
Keyword(s):  
Thermal Properties ◽  
Regioselective Synthesis ◽  
Optoelectronic Materials ◽  
Molecular Scaffold ◽  
Metal Free ◽  
Organic Optoelectronic ◽  
Metal Catalyzed

Pyrazine is an important molecular scaffold employed in organic optoelectronic materials.

scholarly journals Fully Lignocellulose-Based PET Analogues for the Circular Economy

2021 ◽  
Author(s):  
Xianyuan Wu ◽  
Maxim Galkin ◽  
Zhuohua Sun ◽  
Katalin Barta
Keyword(s):  
Thermal Properties ◽  
Dicarboxylic Acid ◽  
Circular Economy ◽  
Terephthalic Acid ◽  
Methyl Esters ◽  
Woody Biomass ◽  
Environmental Concerns ◽  
Metal Free ◽  
Raney Ni ◽  
Excellent Chemical

Polyethylene terephthalate (PET) is one of the most abundantly used polymers, but also a significant pollutant in oceans. Due to growing environmental concerns, novel PET alternatives are highly sought after. Here we present readily recyclable PET analogues made entirely from woody biomass. Central to the concept is a two-step noble metal free catalytic sequence (Cu20-PMO catalyzed reductive catalytic fractionation and Raney Ni mediated catalytic funneling) that allows for obtaining a single aliphatic diol (PC) in 56.4% efficiency as well as other product streams convertible to fuels. The diol PC is co-polymerized with methyl esters of terephthalic acid (TPA) and furan dicarboxylic acid (FDCA), both of which can be derived from the cellulose residues, to obtain polyesters with competitive Mw and thermal properties (Tg of 70–90 °C). The new polymers show excellent chemical recyclability in methanol and are thus promising candidates for the circular economy.<br>

Synthesis, characterization, aggregation and thermal properties of a novel polymeric metal-free phthalocyanine and its metal complexes

Polyhedron ◽  
2009 ◽  
Vol 28 (11) ◽  
pp. 2268-2276 ◽  
Author(s):  
Ahmet Bilgin ◽  
Çiğdem Yağcı ◽  
Ufuk Yıldız ◽  
Ersel Özkazanç ◽  
Erdoğan Tarcan
Keyword(s):  
Thermal Properties ◽  
Metal Complexes ◽  
Metal Free

scholarly journals Preparation and mechanical properties of PCL-based polyurethanes as potential biomaterials for short-term applications

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Marcin Sobczak ◽  
Cezary Dębek ◽  
Piotr Goś
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Ring Opening ◽  
Soft Segment ◽  
Ring Opening Polymerization ◽  
Mechanical And Thermal Properties ◽  
Short Term ◽  
Metal Free ◽  
Molecular Weights

AbstractA series of polyurethanes (PURs) were prepared by metal-free method, containing polycaprolactone (PCL) as the soft segment with molecular weights of 1600, 2400 and 2600. PCL was obtained by the ring-opening polymerization of ε- caprolactone in the presence L-alanine and L-phenyloalanine. The structure of synthesized oligoesters and PURs were spectroscopically confirmed. The molecular weights, mechanical and thermal properties of the obtained materials were reported.

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