scholarly journals Thermal, structural and degradation properties of an aromatic–aliphatic polyester built through ring-opening polymerisation

2017 ◽  
Vol 8 (22) ◽  
pp. 3530-3538 ◽  
Author(s):  
Erlantz Lizundia ◽  
Vishalkumar A. Makwana ◽  
Aitor Larrañaga ◽  
José Luis Vilas ◽  
Michael P. Shaver
Keyword(s):  
Thermal Analysis ◽  
Dynamic Mechanical Analysis ◽  
Ring Opening ◽  
Mechanical Analysis ◽  
The Novel ◽  
Aliphatic Polyester ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dynamic Mechanical ◽  
Degradation Properties

The novel biodegradable aromatic–aliphatic polyester, poly(2-(2-hydroxyethoxy)benzoate), was explored through thermal analysis, X-ray diffraction, dynamic mechanical analysis and comparative bio and catalysed degradation.

scholarly journals Interplay between Structure and Dynamics in Chitosan Films Investigated with Solid-State NMR, Dynamic Mechanical Analysis, and X-ray Diffraction

2011 ◽  
Vol 12 (4) ◽  
pp. 1380-1386 ◽  
Author(s):  
Carmiña Gartner ◽  
Betty Lucy López ◽  
Ligia Sierra ◽  
Robert Graf ◽  
Hans W. Spiess ◽  
...  
Keyword(s):  
Solid State ◽  
Dynamic Mechanical Analysis ◽  
Solid State Nmr ◽  
Mechanical Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dynamic Mechanical ◽  
Structure And Dynamics ◽  
Chitosan Films

scholarly journals Construction of Mechanically Reinforced Thermoplastic Polyurethane from Carbon Dioxide-Based Poly(ether carbonate) Polyols via Coordination Cross-Linking

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2765
Author(s):  
Gaosheng Gu ◽  
Jincheng Dong ◽  
Zhongyu Duan ◽  
Binyuan Liu
Keyword(s):  
Carbon Dioxide ◽  
Dynamic Mechanical Analysis ◽  
Thermoplastic Polyurethane ◽  
Mechanical Analysis ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Dynamic Mechanical ◽  
Chemical Structures ◽  
Vis Spectroscopy

Using carbon dioxide-based poly(propylene ether carbonate) diol (PPCD), isophorone diisocyanate (IPDI), dimethylolbutyric acid (DMBA), ferric chloride (FeCl3), and ethylene glycol (EG) as the main raw materials, a novel thermoplastic polyurethane (TPU) is prepared through coordination of FeCl3 and DMBA to obtain TPU containing coordination enhancement directly. The Fourier transform infrared spectroscopy, 1H NMR, gel permeation chromatography, UV−Vis spectroscopy, tensile testing, dynamic mechanical analysis, X-ray diffraction, differential scanning calorimetry, and thermogravimetric analysis were explored to characterize chemical structures and mechanical properties of as-prepared TPU. With the increasing addition of FeCl3, the tensile strength and modulus of TPU increase. Although the elongation at break decreases, it still maintains a high level. Dynamic mechanical analysis shows that the glass-transition temperature moves to a high temperature gradually along with the increasing addition of FeCl3. X-ray diffraction results indicate that TPUs reinforced with FeCl3 or not are amorphous polymers. That FeCl3 coordinates with DMBA first is an effective strategy of getting TPU, which is effective and convenient in the industry without the separation of intermediate products. This work confirms that such Lewis acids as FeCl3 can improve and adjust the properties of TPU contenting coordination structures with an in-situ reaction in a low addition amount, which expands their applications in industry and engineering areas.

scholarly journals The Potential for Natural Stones from Northeastern Brazil to Be Used in Civil Construction

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 440
Author(s):  
Fabiana Pereira da Costa ◽  
Jucielle Veras Fernandes ◽  
Luiz Ronaldo Lisboa de Melo ◽  
Alisson Mendes Rodrigues ◽  
Romualdo Rodrigues Menezes ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Chemical Resistance ◽  
Mechanical Analysis ◽  
Northeastern Brazil ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chemical Agents ◽  
Natural Stones

Natural stones (limestones, granites, and marble) from mines located in northeastern Brazil were investigated to discover their potential for use in civil construction. The natural stones were characterized by chemical analysis, X-ray diffraction, differential thermal analysis, and optical microscopy. The physical-mechanical properties (apparent density, porosity, water absorption, compressive and flexural strength, impact, and abrasion) and chemical resistance properties were also evaluated. The results of the physical-mechanical analysis indicated that the natural stones investigated have the potential to be used in different environments (interior, exterior), taking into account factors such as people’s circulation and exposure to chemical agents.

Synthesis, characterization, and structures of zircona- and boracyclosiloxanes with ferrocenyl substituents

2002 ◽  
Vol 80 (11) ◽  
pp. 1469-1480 ◽  
Author(s):  
Karena Thieme ◽  
Sara C Bourke ◽  
Juan Zheng ◽  
Mark J MacLachlan ◽  
Fojan Zamanian ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
The Novel ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Multinuclear Nmr Spectroscopy

The novel zirconatetraferrocenylcyclotrisiloxane Cp2Zr(OSiFc2)2O (6), dizirconatetraferrocenylcyclotetrasiloxane [Cp2Zr(OSiFc2)O]2 (7), boratetraferrocenylcyclotrisiloxane (C6H5)B(OSiFc2)2O (8), and diboratetraferrocenylcyclotetrasiloxane [(C6H5)B(OSiFc2)O]2 (9) with ferrocenyl (Fc = Fe(η-C5H4)(η-C5H5)) substituents at silicon have been prepared from the reactions of Cp2Zr(NMe2)2 and PhBCl2 with diferrocenylsilanediol Fc2Si(OH)2 (3) and tetraferrocenyldisiloxanediol [Fc2SiOH]2O (5). The compounds were characterized by mass spectrometry, elemental analysis, UV–vis, IR, Raman, and multinuclear NMR spectroscopy, as well as single crystal X-ray diffraction. Thermogravimetric analysis and differential scanning calorimetry investigation of 6–9 showed that the cycles decompose before they can undergo any thermal ring-opening polymerization. In addition, no polymerization was detected in the presence of either KOSiMe3 or HOTf. The bulky ferrocenyl substituents on the Si atoms are likely to be at least partially responsible for the inability of these heterocycles to undergo ring-opening polymerization. Key words: heterocyclosiloxanes, ferrocenyl.

The Structure of the Novel Lichen Xanthone Thiomelin and Its Cogenors

1987 ◽  
Vol 40 (7) ◽  
pp. 1169 ◽  
Author(s):  
JA Elix ◽  
KL Gaul ◽  
M Sterns ◽  
MW Binsamsudin
Keyword(s):  
Crystal Structure ◽  
Structure Determination ◽  
Ring Opening ◽  
Spectroscopic Data ◽  
The Novel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lichen Metabolite

The structure determination of thiomelin (2,4-dichloro-1,8-dihydroxy-5-methoxy-6-methyl-9H-xanthen-9-one) (3), an unusual lichen metabolite probably derived biosynthetically by oxidative ring opening of a precursor anthraquinone, is reported. The crystal structure of thiomelin diacetate (4) was determined by X-ray diffraction, while that of the cogenors 8-O-methylthiomelin (5), 4-dechlorothiomelin (7), 4-dechloro-8- O- methylthiomelin (9), 2-dechloro-8- O- methylthiomelin (10) and 2,4-dichloro-l-hydroxy-7-methoxy-6,8-dimethyl-9H-xanthen-9-one (12) were deduced from spectroscopic data.

scholarly journals Study of selected thermoplastics using dynamic mechanical analysis

2018 ◽  
Vol 157 ◽  
pp. 07002
Author(s):  
Marcel Kohutiar ◽  
Mariana Pajtášová ◽  
Róbert Janík ◽  
Iveta Papučová ◽  
Jana Pagáčová ◽  
...  
Keyword(s):  
Glass Transition ◽  
Infrared Spectroscopy ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Dynamic Mechanical Analysis ◽  
Mechanical Analysis ◽  
Stress And Strain ◽  
Analysis Method ◽  
X Ray ◽  
Dynamic Mechanical

The aim of given paper is to study selected polymers using dynamic mechanical analysis method (DMA). DMA is one of the most useful techniques for the study of the viscoelastic behaviour of thermoplastic polymers. In relation to DMA, an oscillatory stress and strain is applied to the material at specific frequencies and temperatures and based on this mentioned fact hereinbefore, the resulting changes after the loading in the material are measured. This technique allows detecting the melting temperature and the glass transition temperature of the thermoplastic materials. Furthermore, some spectroscopy techniques, such as energy dispersive X-ray spectroscopy (EDX) and infrared spectroscopy (IR), were also used for the investigation of the thermoplastics. The thermoplastics used for examination, namely polyethylene, polystyrene, polypropylene and polyethylene terephthalate, were gained from the waste of the packaging.

Advanced properties of composites of recycled high-density polyethylene and microfibers of sugarcane bagasse

2017 ◽  
Vol 52 (7) ◽  
pp. 867-876 ◽  
Author(s):  
Sibele Piedade Cestari ◽  
Gerson Alberto Valencia Albitres ◽  
Luis C Mendes ◽  
Volker Altstädt ◽  
Jair Braga Gabriel ◽  
...  
Keyword(s):  
Optical Microscopy ◽  
Dynamic Mechanical Analysis ◽  
Sugarcane Bagasse ◽  
High Density Polyethylene ◽  
Building Materials ◽  
Mechanical Analysis ◽  
High Density ◽  
Wide Angle ◽  
X Ray ◽  
Dynamic Mechanical

Aiming to systematically convert post-consumer plastics in building materials, we compounded recycled high-density polyethylene and sugarcane bagasse. We ranged the polymer/filler ratio from 100/0 to 60/40, and assessed the properties using optical microscopy, water absorption test, adhesion by tape test, low-field nuclear magnetic resonance, dynamic-mechanical analysis, and wide-angle X-ray diffractometry. The optical microscopy of the triturated bagasse showed the reduced and heterogeneous fiber sizes. The absorption and adhesion test showed that the polymer more heavily filled with bagasse can better absorb and anchor paint with organic solvent base. The dynamic-mechanical analysis and wide-angle X-ray diffractometry led us to believe that the bagasse fibers somehow structured the amorphous region amongst the crystallized lamellae of the polymeric matrix. We concluded that these composites have interesting properties to produce building materials.

Study on Novel Structure of Mn-Di(3,4,6,7-tetramethyl-1,10-phenanthroline) Dichloride: [Mn(C16H16N2)2]·Cl2

2012 ◽  
Vol 531-532 ◽  
pp. 413-416
Author(s):  
Hai Xing Liu ◽  
Hua Mei Guo ◽  
Jing Zhong Xiao ◽  
Guang Zeng ◽  
Hui Juan Yue ◽  
...  
Keyword(s):  
Ring Opening ◽  
Chelating Agents ◽  
Complex Structure ◽  
The Novel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diimine Ligands ◽  
Supramolecular Architectures ◽  
Novel Structure ◽  
Phenanthroline Complex

Metal complexes containing diimine ligands such as 1,10-phenanthroline and bipyridine are very important and widely used in analytical chemistry, catalysis, electrochemistry, ring-opening metathesis polymerization and biochemistry. 1,10-phenanthroline, which is the parent for important class chelating agents, has been widely used in the construction of supramolecular architectures. Lots of phenanthroline and its derivatives complex have been synthesized and reported. In the paper, a novel Mn and 3,4,6,7-tetramethyl-1,10-phenanthroline complex [Mn(C16H16N2)2] •Cl2 has been synthesized from a solution reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. [Mn(C16H16N2)2] •Cl2, Orthorhombic, Pnna. a = 8.8376(8)Å b = 18.3630(17)Å c = 18.0159(18)Å α=β=γ=90°. V= 2923.7(5)Å3. Z=4. Rgt(F) = 0.0341, wRref(F2) = 0.0958. T= 273(2) K. The novel Mn metal complex structure is explained clearly.

DMA thermal analysis of yacon tuberous roots

2013 ◽  
Vol 27 (4) ◽  
pp. 479-483
Author(s):  
J. Blahovec ◽  
M. Lahodová ◽  
M. Kindl ◽  
E.C. Fernández
Keyword(s):  
Thermal Analysis ◽  
Dynamic Mechanical Analysis ◽  
Mechanical Analysis ◽  
Dynamic Mechanical ◽  
Tuberous Roots ◽  
Test Parameters ◽  
Storage And Loss Moduli ◽  
Short Time ◽  
Composition Changes ◽  
Different Parts

Abstract Specimens prepared from yacon roots in first two weeks after harvest were tested by dynamic mechanical analysis thermal analysis at temperatures between 30 and 90°C. No differences between different parts of roots were proved. There were indicated some differences in the test parameters that were caused by short time storage of the roots. One source of the differences was loss of water during the roots storage. The measured modulus increased during short time storage. Detailed study of changes of the modulus during the specimen dynamic mechanical analysis test provided information about different development of the storage and loss moduli during the specimen heating. The observed results can be caused by changes in cellular membranes observed earlier during vegetable heating, and by composition changes due to less stable components of yacon like inulin.

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