Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Preparation and characterization of poly(lactic acid) composites involving aromatic diboronic acid and organically modified montmorillonite
Date
2020-01-01
Author
Akar, Alinda Oyku
Hacaloğlu, Jale
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
163
views
0
downloads
Cite This
In this study, composites of polylactide, PLA, involving 1, 2 and 3 mass% 1,4-benzene diboronic acid, BDBA, in the absence and presence of 3 mass% organically modified montmorillonite, Cloisite 30B, C30B, were prepared and characterized. Homogenous dispersion for the composites involving only 1 mass% BDBA and agglomeration for the ones with higher BDBA content were observed. For the composites involving nanoclay, mainly intercalated dispersion was detected. Both TGA and DP-MS results indicated a decrease in thermal stability upon the addition of 1 mass% BDBA. However, as the amount of BDBA incorporated into PLA matrix was increased, thermal stability was also increased. Trans-esterification reactions between BDBA and PLA, although caused decomposition of PLA chains at low concentrations of BDBA to a certain extent, at high concentrations generated a cross-linked structure increasing thermal stability. In the presence of C30B, thermal stability of the composites was increased further. This behavior was associated with enhanced interactions of BDBA and PLA upon diffusion into clay layers.
Subject Keywords
Physical and Theoretical Chemistry
,
Condensed Matter Physics
URI
https://hdl.handle.net/11511/57538
Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
DOI
https://doi.org/10.1007/s10973-019-09236-y
Collections
Graduate School of Natural and Applied Sciences, Article
Suggestions
OpenMETU
Core
A theoretical study on the reaction products of quinoline and dimethyl acetylenedicarboxylate
Türker, Burhan Lemi; Yildirir, Y (Elsevier BV, 2004-05-14)
In the literature various structures have been proposed for the products of quinoline and dimethyl acetylenedicarboxylate reaction. In the present study, within the framework of AM1 (RHF) formulism, some light was shed on the mechanism of formation of some of these products.
Enhanced solubility of siloxy-modified polyhedral oligomeric silsesquioxanes in supercritical carbon dioxide
Demirtas, Cansu; Dilek Hacıhabiboğlu, Çerağ (Elsevier BV, 2019-01-01)
Alkyl siloxy functionalization increases the solubility of polyhedral oligomeric silsesquioxanes (POSS) in supercritical carbon dioxide over an order of magnitude compared to its counterpart with fluoroalkyl groups. The studied component, octatrimethylsiloxy POSS also exhibits higher solubility than other previously studied POSS types with various alkyl and methacryl groups. The octatrimethylsiloxy POSS-CO2 solid-vapor equilibrium curves have been constructed at temperatures between 308 and 328 K by measuri...
Theoretical investigation of sulforaphane molecule
Erkoç, Şakir; Erkoc, F (Elsevier BV, 2005-02-14)
The structural and electronic properties of the broccoli sulforaphane molecule have been investigated theoretically by performing semi-empirical molecular orbital (PM3) and density functional theory calculations. The geometry of the molecule has been optimized by PM3 method and the electronic properties and the vibrational spectra of the molecule have been calculated by density functional theory in its ground state.
Synthesis and characterization of a new soluble conducting polymer and its electrochromic device
Varis, Serhat; Ak, Metin; Tanyeli, Cihangir; Akhmedov, Idris Mecidoglu; Toppare, Levent Kamil (Elsevier BV, 2006-12-01)
A mixture of isomers 2,5-di(4-methyl-thiophen-2-yl)-1-(4-nitrophenyl)-1H-pyrrole, 2-(4-methyl-thiophen-2-yl)-5-(3-methyl-thiophen-2-yl)1-(4-nitrophenyl)-1H-pyrrole and 2,5-di(3-methyl-thiophen-2-yl)-1-(4-nitrophenyl)-1H-pyrrole (Me-SNS(NO2)) were synthesized. Resulting monomers were polymerized chemically, producing soluble polymers in common organic solvents. The average molecular weight has been determined by gel permeation chromatography (GPC) as Mn = 5.6 x 10(3) for the chemically synthesized polymer. T...
Theoretical investigation of hydroxytyrosol and its radicals
Erkoc, F; Keskin, N; Erkoç, Şakir (Elsevier BV, 2003-05-05)
The structural and electronic properties of hydroxytyrosol, its three radical isomers, and its three analogues hydroxytyrosol-dihydroxyl isomers have been investigated theoretically by performing semi-empirical self-consistent field molecular orbital theory calculations. The geometry of the systems have been optimized and the electronic properties have been calculated at the level of AMI method.
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
A. O. Akar and J. Hacaloğlu, “Preparation and characterization of poly(lactic acid) composites involving aromatic diboronic acid and organically modified montmorillonite,”
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
, pp. 0–0, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57538.