Compatibilization of immiscible poly(l-lactide) and low density polyethylene blends

Kim, Young Fil; Choi, Chang Nam; Kim, Young Dae; Lee, Ki Young; Lee, Moosung

doi:10.1007/bf02875524

Cited by 104 publications

(72 citation statements)

References 10 publications

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“…PLLA is immiscible with PHB [7] although a small amount of PHB is miscible with PLLA resulting in a lower Tg value [6] . PLLA is also immiscible with PPC [8.9] , butadiene-styrene copolymer (ABS) [10] , poly(-caprolactone) PCL [11] , low density polyethylene blends [12] , poly(vinyl acetate-co-vinyl alcohol) [13] , poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBco-PHV) [14,15] , starch [16,17] and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) PHB/HHx [18] , polystyrene (PS) [19] . Among the practical ways to overcome the problems of this improves immiscibility is the addition of a third polymer with certain amount miscible with the two other polymers to obtain a compatible and miscible polymeric system.…”

Section: Introductionmentioning

confidence: 99%

The effect of additives interaction on the miscibility and crystal structure of two immiscible biodegradable polymers

El-Hadi¹

2014

Polímeros

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Poly lactic acid (PLLA) is a promising biopolymer, obtained from polymerization of lactic acid that is derived from renewable resources through fermentation. The characteristic brittleness of PLLA is attributed to slow crystallization rates, which results in the formation of the large spherulites. Its glass temperature is relative high, above room temperature and close to 60 °C, and therefore its applications are limited. The additives poly((R)-3-hydroxybutyrate) (PHB), poly(vinyl acetate) (PVAc) and tributyl citrate (TBC) were used as compatibilizers in the biodegradable polymer blend of (PLLA/PPC). Results from DSC and POM analysis indicated that the blends of PLLA and PPC are immiscible. However, the blends with additives are miscible. TBC as plasticizer was added to PLLA to reduce its Tg. PVAc was used as compatibilizer to improve the miscibility between PLLA and PPC. FT-IR showed about 7 cm -1 shift in the C=O peak in miscible blends due to physical interactions. POM experiments together with the results of DSC and WAXD showed that PHB enhances the crystallization behavior of PLLA by acting as bio nuclei and the crystallization process can occur more quickly. Consequently an increase was observed in the peak intensity in WAXD.

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Section: Introductionmentioning

confidence: 99%

The effect of additives interaction on the miscibility and crystal structure of two immiscible biodegradable polymers

El-Hadi¹

2014

Polímeros

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“…Thus, processing the green plastic does not require any new investments in equipment or technical adjustments [5][6][7] . Some works [3,[8][9][10][11][12][13] have been blending PLA with PE. However, to date, there are no studies in the literature that uses a PE synthesized with raw material obtained from renewable sources, and ethylene/methyl acrylate/glycidyl methacrylate terpolymer (EMA-GMA) as compatibilizer to this kind of blends.…”

Section: Introductionmentioning

confidence: 99%

Polylactide/Biopolyethylene bioblends

et al. 2012

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Abstract:In this work, Polylactide/Biopolyethylene blends were developed. Although some studies have been carried out on polylactide/polyethylene blends, none of them has used polyethylene synthesized with raw material obtained from natural sources. Due to the incompatibility between polylactide and polyethylene, E-GMA and EMA-GMA compatibilizers were used. These compatibilizers present glycidyl methacrylate groups in their structure, which may react with the functional end-groups of polylactide. To evaluate the properties, the blends were characterized by mechanical tests, scanning electron microscopy (SEM) and melt flow index (MFI). The results indicated that the compatibilizers played an important role in the blends, interacting with the blends components, modifying the morphology and improving the mechanical properties.

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“…PLA/PE blends have also attracted a huge interest because it complements brittleness of the PLA. Studies have shown that blending of PLA with LLDPE resulted in a significant increase in PLA ductility and toughness on expense of strength and modulus [13][14][15][16][17]. Anderson and coworkers [13] showed that for the amorphous PLA the toughening was achieved only when a poly (L-lactide) (PLLA)-PE block copolymer was used as compatibilizer.…”

mentioning

confidence: 99%

“…Anderson and coworkers [13] showed that for the amorphous PLA the toughening was achieved only when a poly (L-lactide) (PLLA)-PE block copolymer was used as compatibilizer. On the other hand Kim and coworkers investigated blends of PLLA and low-density polyethylene (LDPE) and found that the domain size of dispersed phase decreased and the tensile properties enhanced significantly by using a reactive compatibilizer having glycidyl methacrylate (GMA) functional group [14]. Because of the immiscibility of this system, several researchers employed different compatibilizers to further tailoring the properties [16][17].…”

mentioning

confidence: 99%

Tuning the processability, morphology and biodegradability of clay incorporated PLA/LLDPE blends via selective localization of nanoclay induced by melt mixing sequence

As’habi¹,

Jafari

Khonakdar³

et al. 2013

Express Polym. Lett.

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Abstract. Polylactic acid (PLA)/linear low density polyethylene (LLDPE) blend nanocomposites based on two different commercial-grade nanoclays, Cloisite ® 30B and Cloisite ® 15A, were produced via different melt mixing procedures in a counter-rotating twin screw extruder. The effects of mixing sequence and clay type on morphological and rheological behaviors as well as degradation properties of the blends were investigated. The X-ray diffraction (XRD) results showed that generally the level of exfoliation in 30B based nanocomposites was better than 15A based nanocomposites. In addition, due to difference in hydrophilicity and kind of modifiers in these two clays, the effect of 30B on refinement of dispersed phase and enhancement of biodegradability of PLA/LLDPE blend was much more remarkable than that of 15A nanoclay. Unlike the one step mixing process, preparation of nanocomposites via a two steps mixing process improved the morphology. Based on the XRD and TEM (transmission electron microscopic) results, it is found that the mixing sequence has a remarkable influence on dispersion and localization of the major part of 30B nanoclay in the PLA matrix. Owing to the induced selective localization of nanoclays in PLA phase, the nanocomposites prepared through a two steps mixing sequence exhibited extraordinary biodegradability, refiner morphology and better melt elasticity.

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Compatibilization of immiscible poly(l-lactide) and low density polyethylene blends

Cited by 104 publications

References 10 publications

The effect of additives interaction on the miscibility and crystal structure of two immiscible biodegradable polymers

The effect of additives interaction on the miscibility and crystal structure of two immiscible biodegradable polymers

Polylactide/Biopolyethylene bioblends

Tuning the processability, morphology and biodegradability of clay incorporated PLA/LLDPE blends via selective localization of nanoclay induced by melt mixing sequence

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