Poly(lactic acid)-layered silicate nanocomposites: The effects of modifier and compatibilizer on the morphology and mechanical properties

Cumkur, Eda Acik
Baouz, Touffik
Yılmazer, Ülkü
Poly(lactic acid) (PLA) based nanocomposites were prepared to investigate the effects of types of nanoclays. Five different organically modified nanoclays (Cloisites((R))15A, 25A, and 30B, and Nanofils((R))5 and 8) were used. Two rubbery compatibilizers, ethylene-glycidyl methacrylate (E-GMA) and ethylene-butyl acrylate-maleic anhydride, were used in the nanocomposites as compatibilizer-impact modifier. The degree of clay dispersion, the chemical compatibility between the polymer matrix and the compatibilizers, and changes in the morphology and mechanical properties of the nanocomposites were investigated. The mechanical properties and the morphological studies showed that the interactions between the different compatibilizers and PLA resulted in different structures and properties; such that the dispersion of clay, droplet size of the compatibilizer, and tensile properties were distinctly dependent on the type of the compatibilizer. Compatibility between C25A, C30B, and E-GMA resulted in the best level of dispersion, leading to the highest tensile modulus and toughness among the compositions studied. In the mentioned nanocomposites, a network structure was formed owing to the high reactivity of the epoxide group of GMA towards the PLA end groups resulting in high impact toughness. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42553.


Poly(lactic acid) based nanocomposites: mechanical, thermal and rheological properties and morphology
Açık, Eda; Yılmazer, Ülkü; Department of Chemical Engineering (2014)
The aim of this study was to increase the potential applications of poly(lactic acid) (PLA) by incorporating reactive functionalities with different nano-scale fillers. To investigate the effects of nanoclay types, five different organically modified nanoclays (Cloisites®15A, 25A and 30B and Nanofils®5 and 8) were used. Two elastomeric compatibilizers, ethylene-glycidyl methacrylate (E-GMA) and ethylene-butyl acrylate-maleic anhydride (E-BA-MAH), were added to the nanocomposites produced via melt compoundin...
Covalent immobilization of invertase on chemically activated poly(2-hydroxyethyl methacrylate) microbeads
Altinok, H.; Aksoy, S.; Tumturk, H.; Hasırcı, Nesrin (2006-10-01)
Properties of invertase immobilized on poly(2-hydroxyethyl methacrylate) microbeads activated by epichlorohydrin or cyanuric chloride were studied. After 20 repeated uses for 3 days, the activity of the immobilized enzyme was 92-93%.
Highly Crystalline Poly(L-lactic acid) Porous Films Prepared with CO2-philic, Hybrid, Liquid Cell Nucleators
Culhacioglu, Yagmur; Hasırcı, Nesrin; Dilek Hacıhabiboğlu, Çerağ (2019-12-18)
Supercritical CO2 (scCO(2)) foaming of poly(L-lactic acid) composite films with liquid polyhedral oligomeric silsesquioxanes (PLLA-POSS) was carried out to obtain polymer matrices for drug delivery applications. Highly crystalline (>45%) PLLA generally requires high supercritical processing (saturation) temperatures close to its melting temperature (similar to 450 K) and pressures about or over 20 MPa for foaming with scCO(2). To decrease the saturation temperature and obtain ductile PLLA films with uniform...
Microtensile Bond Strength of Self-Adhesive Resin-Based Dental Cement to Bleached Enamel
Tamam, Evsen; Keskin, Selda; Ucatasli, Mine Betuel (Informa UK Limited, 2010-01-01)
This study investigated the effectiveness of bleaching agents on the micro tensile bond strength (mu TBS) of self-adhesive luting cement and enamel. A total of 126 samples were prepared from the labial surfaces of permanent human maxillary central incisors and assigned into three groups with 42 samples each as: control, enamel bleached with 10% hydrogen peroxide (HP), and enamel bleached with 10% carbamide peroxide (CP). Rely X Unicem (R) (3 M, ESPE) was used as self-adhesive resin cement. The total testing...
Pyrolysis of of poly(methy methacrylate) copolymers
Ozlem-Gundogdu, Suriye; Gurel, Evren Aslan; Hacaloğlu, Jale (2015-05-01)
In this work, thermal degradation of copolymers of poly(methy methacrylate) namely, poly(methyl methacrylate-co-n-butyl acrylate), P(MMA-co-nBu), poly(methyl methacrylate-co-n-benzyl methacrylate) P(MMA-co-BzMA, and poly(methyl methacrylate-co-isobornyl acrylate), P(MMA-co-IBA) were investigated via direct pyrolysis mass spectrometry. It was determined that whether an available gamma-H with respect to the carbonyl groups is present or not determines the thermal degradation mechanisms of polyacrylates and po...
Citation Formats
E. A. Cumkur, T. Baouz, and Ü. Yılmazer, “Poly(lactic acid)-layered silicate nanocomposites: The effects of modifier and compatibilizer on the morphology and mechanical properties,” JOURNAL OF APPLIED POLYMER SCIENCE, pp. 0–0, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56676.