The Properties of Poly(l-Lactide) Prepared by Different Synthesis Procedure

Ristić, Ivan; Tanasić, Ljiljana; Nikolić, Ljubiša; Cakić, Suzana; Ilić, Olivera Z.; Radičević, Radmila; Budìnski‐Simendìć, Jaroslava

doi:10.1007/s10924-011-0297-1

Cited by 23 publications

(19 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Three different thermal transitions were detected on DSC thermograms: the glass‐transition, characterized by glass transition temperature ( T g ), the cold crystallization process, identified by cold crystallization temperature ( T cc ) and crystallization enthalpy (

Δ {\overset{H}{true}}_{normalc}

), and melting process characterized by melting temperature ( T m ) and melting enthalpy (

Δ {\overset{H}{true}}_{normalm}

); the values obtained for the different materials are reported in Table . The glass transition temperature of neat PLA film was detected at 42.6°C, in line with values reported in the literature , and the addition of AU extract increased polymer T g of about 3°C (+ 3.3 and + 2.9°C for PLA filled by 0.5 and 5 wt% of AU extract, respectively), thus slightly improving the thermal stability of the material.…”

Section: Resultssupporting

confidence: 89%

Hybrid Pla/wild garlic antimicrobial composite films for food packaging application

et al. 2018

View full text Add to dashboard Cite

Composite films based on poly(lactic acid) filled by 0.5 and 5 wt.% of Allium ursinum extract (wild garlic) for food packaging applications were prepared. Obtained films were examined from the view of characterization material properties and antimicrobial potential. The addition of two different amounts of A. ursinum extract improved thermal and mechanical properties of neat PLA (increase in T g and tensile strength for both loadings). The oxygen barrier properties of the obtained hybrid films in dry condition were not significantly modified, while a slight increase of oxygen transmission rate was observed for the 5% loaded samples. Differences were detected in DE* values among the films containing A. ursinum extract in comparison with neat PLA. A marked difference between neat PLA and sample with 0.5 wt% of A. ursinum extract (3-6) was observed, while the color of the samples with 5 wt% was characterized by a completely different shade compared with neat PLA (>12). The antimicrobial activity of PLA films (neat and with 0.5 and 5 wt% of A. ursinum extract) was tested against Gram-negative bacterium Escherichia coli and both polymer composites with 0.5 and 5 wt% AU extract showed antimicrobial activity. POLYM. COMPOS., 00:000-000,

show abstract

Δ {\overset{H}{true}}_{normalc}

), and melting process characterized by melting temperature ( T m ) and melting enthalpy (

Δ {\overset{H}{true}}_{normalm}

Section: Resultssupporting

confidence: 89%

Hybrid Pla/wild garlic antimicrobial composite films for food packaging application

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Because of concerns for the global environment biodegradable polymers became appropriate alternatives for many petrochemical‐based polymers. Bio‐renewable and biodegradable materials, such as lactide [1] or isosorbide, are becoming more and more important as potential solution for polymer waste decreasing. Poly(lactide) (PLA) has attracted much attention due to its renewability and ability to hydrolyze in lactic acid which can be metabolized to carbon(IV) oxide and water.…”

Section: Introductionmentioning

confidence: 99%

The influence of isosorbide on thermal properties of poly(L‐lactide) synthesized by different methods

Ristić

Radusin

Pilić

et al. 2012

Polymer Engineering & Sci

Self Cite

View full text Add to dashboard Cite

In this article, we analyzed the influence of isosorbide content on glass transition temperature and crystallinity of poly(L‐lactide). Different synthesis methods were applied to determine optimal procedure for polymerization of L‐lactide in the presence of isosorbide. Two procedures were performed with tin(II) 2‐ethylhexanoate as the catalyst: first, using the vacuum sealed vessel, and second, using microwave reactor bulk polymerizations. The solution polymerization (with trifluoromethanesulfonic acid as catalyst) was possible at the temperature of 40°C. Obtained polyesters had number average molecular weights ranging from 20,000 to 65,000 g mol–1, according to the gel permeation chromatography measurements. The polymer structure was characterized by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance spectroscopy. Thermal properties of the obtained polymers were analyzed using thermogravimetry (TG) and differential scanning calorimetry (DSC). According to DSC measurements, the addition of isosorbide in the polyesters influenced the increase in both glass transition temperature and degree of crystallization for all samples. The results obtained by thermogravimetric analysis confirmed the strong influence of polymerization mechanism on synthesized poly(L‐lactides) thermal properties. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers

show abstract

“…In the spectra of the obtained composites a broad absorption band of the hydroxyl (OH) stretching vibrations is present between 3220 and 3590 cm -1 . Asymmetrical valence vibrations of C-O-C of the aliphatic polymer chain were shifted to 1183 cm -1 and 1193 cm -1 , and symmetrical valence vibrations of C-O-C of the aliphatic chain to 1086 and 1090 cm -1 , for chf-MWCNT-PLLA-0.7 and γ-MWCNT-PLLA-0.7 composites, respectively, as compared to the bands at 1267 and 1099 cm -1 reported for the monomer L-lactide spectrum [37]. FT-IR spectroscopy confirmed successful polymerisation of lactide from the surface of chemically and irradiation functionalized MWCNTs.…”

Section: Fig 3 Tg Weight Loss Curves Of Pristine Irradiation (γ-Mwmentioning

confidence: 59%

Influence of different functionalization methods of multi-walled carbon nanotubes on the properties of poly(L-lactide) based nanocomposites

Vukić

Ristić

Marinović‐Cincović

et al. 2019

Hem Ind

View full text Add to dashboard Cite

This paper presents influence of the type of carbon nanotube functionalization on properties of poly(L-lactide) (PLLA) based nanocomposite materials. For this purpose surface modifications of multi-walled carbon nanotubes (MWCNTs) were performed by chemical and irradiation techniques, while thermo gravimetric analysis, UV-Visible and Fourier-transform infrared (FT-IR) spectroscopies confirmed successful covalent functionalization. Series of PLLA bionanocomposites with different contents of functionalized MWCNTs (0.7; 1.6; 2.1 wt%), were synthesized via ring-opening solution polymerisation of L-lactide. FT-IR analysis confirmed that grafting of Llactide, under controlled condition, is possible to perform starting from the surface of functionalized MWCNTs. From differential scanning calorimetry results it was concluded that even low contents of chemically and irradiation functionalized MWCNTs had a significant effect on thermal properties of the prepared nanocomposites, raising the values of melting and glass transition temperatures. Thermogravimetric analysis (TGA) has shown that the degradation onset temperature for composites with chemically functionalized MWCNTs, was much higher than that for the neat poly(L-lactide) sample and composites with irradiation functionalized MWCNTs. Morphology studies by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) indicated that poly(L-lactide) covered surfaces and separated functionalized MWCNTs. Good dispersion of carbon nanotubes in polymer matrix enabled conductivity of synthesized materials, as determined by conductivity tests.

show abstract

The Properties of Poly(l-Lactide) Prepared by Different Synthesis Procedure

Cited by 23 publications

References 48 publications

Hybrid Pla/wild garlic antimicrobial composite films for food packaging application

Hybrid Pla/wild garlic antimicrobial composite films for food packaging application

The influence of isosorbide on thermal properties of poly(L‐lactide) synthesized by different methods

Influence of different functionalization methods of multi-walled carbon nanotubes on the properties of poly(L-lactide) based nanocomposites

Contact Info

Product

Resources

About