Structure and rheology of recycled PET modified by reactive extrusion

Incarnato, Loredana; Scarfato, Paola; Maio, Luciano Di; Acierno, Domenico

doi:10.1016/s0032-3861(00)00032-x

Cited by 201 publications

(204 citation statements)

References 16 publications

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“…Both polyester end groups (i.e. carboxyl and hydroxyl groups) can react with epoxy functional groups via ring-opening reactions, creating covalent bonds with hydroxyl groups [20]. However, a higher reactivity of epoxy towards the carboxyl groups compared to hydroxyl groups was reported in the literature [21].…”

Section: Resultsmentioning

confidence: 99%

Sheets of branched poly(lactic acid) obtained by one step reactive extrusion calendering process: Melt rheology analysis

Cailloux¹,

Santana

Urquiza³

et al. 2013

Express Polym. Lett.

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Abstract. One-step reactive extrusion-calendering process (REX-Calendering) was used in order to obtain sheets of 1mm from two PD,L-LA extrusion grades modified with a styrene-acrylic multifunctional oligomeric agent. In a preliminary internal mixer study, torque versus time was monitored in order to determine chain extender ratios and reaction time. Once all parameters were optimized, reactive extrusion experiments were performed. Independently of the processing method employed, under the same processing conditions, PD,L-LA with the lower D enantiomer molar content revealed a higher reactivity towards the reactive agent, induced by its higher thermal sensitivity. REXCalendering process seemed to minimize the degradations reactions during processing, although a competition between degradation and chain extension/branching reactions took place in both processes. Finally, the rheological characterization revealed a higher degree of modification in the melt rheological behaviour for REX-Calendered samples.

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Section: Resultsmentioning

confidence: 99%

Sheets of branched poly(lactic acid) obtained by one step reactive extrusion calendering process: Melt rheology analysis

Cailloux¹,

Santana

Urquiza³

et al. 2013

Express Polym. Lett.

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“…For polyesters, chain-extension consists in increasing the molecular weight by bridging the hydroxyl or carboxyl reactive-end groups using bi or poly-functional molecules. For PET, branching was obtained by reaction with pyromellitic dianhydride, [24][25][26], and with various epoxy-based chain-extenders, [27][28][29][30][31]. For PLA, various diisocyanate were investigated for this purpose [32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Rheology and extrusion foaming of chain‐branched poly(lactic acid)

Mihai

Huneault

Favis

2009

Polymer Engineering & Sci

232

204

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Rheology and extrusion foaming of chain-branched poly(lactic acid)Mihai, Mihaela; Huneault, Michel A.; Favis, Basil D.Contact us / Contactez nous: nparc.cisti@nrc-cnrc.gc.ca. In this study, the effect of macromolecular chainbranching on poly(lactic acid) (PLA) rheology, crystallization, and extrusion foaming was investigated. Two PLA grades, an amorphous and a semi-crystalline one, were branched using a multifunctional styrene-acrylicepoxy copolymer. The branching of PLA and its foaming were achieved in one-step extrusion process. Carbon dioxide (CO 2 ), in concentration up to 9%, was used as expansion agent to obtain foams from the two PLA branched using chain-extender contents up to 2%. The foams were investigated with respect to their shear and elongational behavior, crystallinity, morphology, and density. The addition of the chain-extender led to an increase in complex viscosity, elasticity, elongational viscosity, and in the manifestation of the strain-hardening phenomena. Low-density foams were obtained at 5-9% CO 2 for semi-crystalline PLA and only at 9% CO 2 in the case of the amorphous PLA. Differences in foaming behavior were attributed to crystallites formation during the foaming process. The rheological and structural changes associated with PLA chain-extension lowered the achieved crystallinity but slightly improved the foamability at low CO 2 content. POLYM. ENG. SCI.,

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“…Poly (ethylene terephthalate) (PET), commonly referred to as 'polyester' in the textile industry, is considered to be one of the most important thermoplastic polyesters (Incornato et al 2000). It is widely used for various applications such as bottles, fibers, moldings, and sheets because of its excellent tensile and impact strength, clarity, processability, chemical resistance, and thermal stability (Pawlak et al 2000;Kong and Hay 2003;Avila-Orta et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Poly (ethylene terephthalate) recycling for high value added textiles

Park

Kim

2014

Fashion and Textiles

257

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This study reviews the problems in the use and disposal of poly (ethylene terephthalate) (PET) and includes the concise background of virgin and recycled PET as well as their possible applications. The current state of knowledge with respect to PET recycling method is presented. Recycling of PET is the most desirable method for waste management, providing an opportunity for reductions in oil usage, carbon dioxide emissions and PET waste requiring disposal because of its non-degradability. Advanced technologies and systems for reducing contamination, mechanical and chemical recycling, and their applications are discussed, and the possibility of diverting the majority of PET waste from landfills or incineration to recycling is suggested.

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Structure and rheology of recycled PET modified by reactive extrusion

Cited by 201 publications

References 16 publications

Sheets of branched poly(lactic acid) obtained by one step reactive extrusion calendering process: Melt rheology analysis

Sheets of branched poly(lactic acid) obtained by one step reactive extrusion calendering process: Melt rheology analysis

Rheology and extrusion foaming of chain‐branched poly(lactic acid)

Poly (ethylene terephthalate) recycling for high value added textiles

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