Natural Weathering Evaluation of LDPE‐Mango Starch Blends by Mechanical Properties and High Field NMR

Rodrigues, Tathiane Cordeiro; Tavares, Maria Inês Bruno; Pita, Victor Jayme Roget Rodriguez

doi:10.1002/masy.200651323

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Since synthetic polymers require longer weather exposure to study the effect of environmental degradation on these materials, when it comes to biodegradable polymers, this time becomes considerably shorter. Rodrigues et al (2006) produced blends with low-density polyethylene and up to 2% mango starch, which were subjected to natural degradation. The authors concluded that the starch content, as well as the exposure time, correlated with the formation of voids in the polymer matrix.…”

Section: Moreno Et Al (2022)mentioning

confidence: 99%

Natural weathering of composites developed from cellulose waste and post-consumer paper

Gomes

Rodrigues

Santos

et al. 2022

Rev. Bras. Ciênc. Ambient.

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The development of materials that are highly degradable at the end of their life cycle helps reduce the volume of solid waste disposed of in landfills. This study aimed to produce composites from cellulose and paper residues as reinforcing fibers and from thermoplastic starch (TPS) as a matrix to analyze the effect of exposure to natural weathering in the environments of two Universities, one in Brazil (Universidade Feevale) and the other in Finland (HAMK). During the test period, the season in Brazil was summer, with high temperatures and solar radiation; in Finland, the season was winter, with negative temperatures, high air humidity, and snowfall. The materials were prepared using the tape-casting method and characterized by Dynamic Mechanical Analysis (DMA) and Thermogravimetric Analysis (TGA), having been subjected to the weather for 0, 28, and 42 days at Universidade Feevale and HAMK. At the end of each period, they were characterized by Scanning Electron Microscopy (SEM) and photographs. The results showed that the thermal stability of the composites was better compared to TPS and cellulose, and superior mechanical properties were shown in the cellulose-based composite. Thus, heterogeneous mixtures emerged from the addition of fibers to the polymer matrix. After the environmental exposure, the visualization of the micrographs and photographs indicated that the samples exposed in the two environments were brittle, shrunken, yellowed, and cracked. It was also verified that the samples exposed at Universidade Feevale suffered greater environmental degradation, and the incorporation of fibers in the composites delayed this effect at the two study sites.

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Section: Moreno Et Al (2022)mentioning

confidence: 99%

Natural weathering of composites developed from cellulose waste and post-consumer paper

Gomes

Rodrigues

Santos

et al. 2022

Rev. Bras. Ciênc. Ambient.

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“…Researches have been done to improve this polymer degradation process. Many studies were carried out to obtain blends with polysaccharides, like starch, for example [1,2], therefore only little improvement was obtained with these materials. Recently the development of new materials, in special polymeric nanocomposites, formed by polymer and layered silicates, have gained attention [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

The Use of Solid State NMR to Characterize High Density Polyethylene/Organoclay Nanocomposites

Rodrigues¹,

Tavares²,

Soares³

et al. 2009

ChChT

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Recently the development of new materials, in special polymeric nanocomposites, formed by polymer and layered silicates, have gained attention. In this work nanocomposites based on high-density polyethylene matrix (HDPE) and organically modified clay were prepared by melt processing and characterized by the determination of proton spin-lattice relaxation time through solid state nuclear magnetic resonance (NMR) spectroscopy. This work has a proposal to add one quantitative technique to help the researchers to better evaluate polymeric nanocomposite, because NMR is an important tool employed to study both molecular structure and dynamic molecular behavior. The nanocomposites were mixed in a twin-screw extruder, varying the shear rate parameter: 60 and 90 rpm at 463 K. Nanocomposites obtained were characterized through X-ray diffraction; thermal analysis; impact resistance and nuclear magnetic resonance. The T1H results showed that the samples present different molecular domains according to the clay dispersion, forming an intercalated and/or exfoliated nanocomposites. The measurement of relaxation time, using low field NMR, is a useful method to evaluate changes in the molecular mobility of nanocomposite and can infer whether the sample is exfoliated and/or intercalated, since lamellar filler is used.

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Plastic deformation of low‐density polyethylene reinforced with biodegradable polylactide, Part 1: Microstructural analysis and tensile behavior at constant true strain‐rate

Rezgui¹,

G'Sell²,

Dahoun³

et al. 2010

Polymer Engineering & Sci

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Blends of low‐density polyethylene (LDPE) and polylactide (PLA) were prepared by melt coextrusion. The plastic behavior of the LDPE/PLA blends was investigated at room temperature under uniaxial tension by means of a video‐controlled system. The constitutive behavior was analyzed in terms of the variations of true stress vs. true strain at constant true strain rate. With increasing concentrations of PLA, the blend show: (i) higher Young's modulus, (ii) stiffer viscoelastic response, (iii) increase of elastic limit stress, and (iv) earlier fracture. Particular attention was paid to the evolution of the volume strain with the applied strain. While dilatation begins very lately for the neat LDPE, the LDPE/PLA blends show increasing deformation damage as the PLA content is increased. Scanning electron microscopy of deformed specimens shows that cavitation occurs preferentially at the poles of the PLA particles whose adhesion to the LDPE matrix seems very weak despite the partial grafting of polyethylene chains with maleic anhydride. POLYM. ENG. SCI., 2011. © 2010 Society of Plastics Engineers.

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Natural Weathering Evaluation of LDPE‐Mango Starch Blends by Mechanical Properties and High Field NMR

Cited by 3 publications

References 7 publications

Natural weathering of composites developed from cellulose waste and post-consumer paper

Natural weathering of composites developed from cellulose waste and post-consumer paper

The Use of Solid State NMR to Characterize High Density Polyethylene/Organoclay Nanocomposites

Plastic deformation of low‐density polyethylene reinforced with biodegradable polylactide, Part 1: Microstructural analysis and tensile behavior at constant true strain‐rate

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