“…It also increased both T m and X c , indicating that Chocolate organoclay acts as a nucleating agent to PLA crystals growth 93 . The cold crystallization diminished with the addition of both organoclays, probably the cold crystallization diminished with the addition of both organoclays, probably due to the high surface energy related to the exfoliated clays, which serve as nucleating sites for PLA 94 . The decrease in X c exhibited by the PLA‐Bofe organoclay sample could be a result of an adequate interfacial adhesion between these phases 61 .…”
The effects of concentration and surface modification of two Brazilian bentonite clays on nanocomposites' properties based on polylactic acid – (PLA) were investigated. The samples were prepared by the extrusion/injection method to obtain biodegradable packaging plastics. The raw materials and their bionanocomposites were characterized by various techniques. Natural clay samples presented a size of around 2 μm while the modified ones' size was 5–6 μm, probably due to the presence of cetyltrimethylammonium bromide in the interlayer space. The particle size and the contact angle increased with the treatment and the clay's density decreased. The organoclays were homogeneously dispersed in PLA, which can be associated with the interactions between PLA chains' carbonyl groups and the organoclays. The bionanocomposites present modified clay particles axis aligned to the flow direction of the extruder/injector. Chocolate organoclay acts as a nucleating agent to PLA crystal growth, increasing the sample's crystallinity, while Bofe organoclay interferes with the amorphous chain's mobility and diminishes the sample's crystallization. The addition of both organoclays to PLA diminished the sample's elongation at break and strength, although the organoclays increased the sample's Young modulus, even though Bofe organoclay is more active in PLA amorphous phase and Chocolate organoclay on the crystalline one.
“…It also increased both T m and X c , indicating that Chocolate organoclay acts as a nucleating agent to PLA crystals growth 93 . The cold crystallization diminished with the addition of both organoclays, probably the cold crystallization diminished with the addition of both organoclays, probably due to the high surface energy related to the exfoliated clays, which serve as nucleating sites for PLA 94 . The decrease in X c exhibited by the PLA‐Bofe organoclay sample could be a result of an adequate interfacial adhesion between these phases 61 .…”
The effects of concentration and surface modification of two Brazilian bentonite clays on nanocomposites' properties based on polylactic acid – (PLA) were investigated. The samples were prepared by the extrusion/injection method to obtain biodegradable packaging plastics. The raw materials and their bionanocomposites were characterized by various techniques. Natural clay samples presented a size of around 2 μm while the modified ones' size was 5–6 μm, probably due to the presence of cetyltrimethylammonium bromide in the interlayer space. The particle size and the contact angle increased with the treatment and the clay's density decreased. The organoclays were homogeneously dispersed in PLA, which can be associated with the interactions between PLA chains' carbonyl groups and the organoclays. The bionanocomposites present modified clay particles axis aligned to the flow direction of the extruder/injector. Chocolate organoclay acts as a nucleating agent to PLA crystal growth, increasing the sample's crystallinity, while Bofe organoclay interferes with the amorphous chain's mobility and diminishes the sample's crystallization. The addition of both organoclays to PLA diminished the sample's elongation at break and strength, although the organoclays increased the sample's Young modulus, even though Bofe organoclay is more active in PLA amorphous phase and Chocolate organoclay on the crystalline one.
“…% of the nanoclays, with a well exfoliated nanocomposite displaying increased stability 71 , 72 . This is presumably due to the thermal stability of inorganic materials 70 , their interactions with the polymer substrate that allow for the formation of char by hindering the release of volatile products 70 , 72 , 73 , or/and to the nanoclays themselves which could potentially be creating a protective barrier when on the surface of the nanocomposite 71 . Figure 1 ( a ) Thermal degradation profile of PLA and PLACC as determined by TGA (n = 2).…”
Section: Resultsmentioning
confidence: 99%
“…Mechanical properties analysis of the nanocomposite showed that PLACC had a significantly higher Young’s Modulus relative to PLA films, thus indicating that CC interacted with the polymer within the volume of the nanocomposite (Supplementary Table S2 ) 71 . However, both the elongation and the tensile strength were lower for the nanocomposites when compared to control films of PLA, presumably due to an uneven dispersion of CC with reduction in chain mobility caused by dispersed nanoclay 104 and the reduction in strength caused by agglomerated or poorly dispersed areas containing nanoclay 105 .…”
Addition of nanoclays into a polymer matrix leads to nanocomposites with enhanced properties to be used in plastics for food packaging applications. Because of the plastics’ high stored energy value, such nanocomposites make good candidates for disposal via municipal solid waste plants. However, upon disposal, increased concerns related to nanocomposites’ byproducts potential toxicity arise, especially considering that such byproducts could escape disposal filters to cause inhalation hazards. Herein, we investigated the effects that byproducts of a polymer polylactic acid-based nanocomposite containing a functionalized montmorillonite nanoclay (Cloisite 30B) could pose to human lung epithelial cells, used as a model for inhalation exposure. Analysis showed that the byproducts induced toxic responses, including reductions in cellular viability, changes in cellular morphology, and cytoskeletal alterations, however only at high doses of exposure. The degree of dispersion of nanoclays in the polymer matrix appeared to influence the material characteristics, degradation, and ultimately toxicity. With toxicity of the byproduct occurring at high doses, safety protocols should be considered, along with deleterious effects investigations to thus help aid in safer, yet still effective products and disposal strategies.
“…There are many publications available on PLA/Clay nanocomposites. This composite is mainly focused on improving thermal [35][36][37], mechanical [38][39][40] and optical properties [41,42]. Such material is also biodegradable [43,44].…”
DL-PLA/CLOISITE 20A nanocomposite is fabricated by solution casting method. , DL-PLA/CLOISITE 20A/PANI Nanocomposite is also synthesized by chemical-oxidation method. Characterization of that nanocomposite is made using XRD, FTIR, UV Visible. TGA studies a wettability studies and dielectric analysis of prepared materials. Results reveal enhancement of thermal stability and crystallinity of the nanocomposite. Further, nanocomposite shows that it is hydrophilic in nature. Frequency dependent ac-conductivity and dielectric loss are estimated for the nanocomposite. Dielectric loss is observed to possess low value (0.2). Fabricated DL-PLA/Cloisite 20A may serve as insulating layers to suppress dielectric loss effectively.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
