Effect of chain extenders on thermal and mechanical properties of poly(lactic acid) at high processing temperatures: Potential application in PLA/Polyamide 6 blend

Khankrua, Rattikarn; Pivsa‐Art, Sommai; Hamada, Hiroyuki; Suttiruengwong, Supakij

doi:10.1016/j.polymdegradstab.2014.04.019

Cited by 84 publications

(52 citation statements)

References 36 publications

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“…The MFI values of Joncyl or Perkadox added to the PLA/EVA blend decreased when compared to that of neat PLA, indicating the higher viscosity and the possible reaction between PLA or EVA and incorporated reactive agents. The addition of Joncryl into the PLA/EVA blend could result in the coupling reaction between end groups of PLA and multifunctional epoxide groups of Joncryl, which consequently led to the higher molecular weight and viscosity of PLA [22,23]. On the other hand, the Perkadox could promote the free radical reaction between PLA and EVA, hence leading to the improved interfacial adhesion between PLA and EVA.…”

Section: Melt Flow Index Of Neat Pla and Pla/eva Blendsmentioning

confidence: 99%

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Development of PLA/EVA Reactive Blends for Heat-Shrinkable Film

et al. 2019

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Heat-shrinkable films have widely been used for various applications such as shrinkable labels and cap seals. These plastics have generally a short life. The biodegradable polymers can thus be an ideal candidate for such applications. This work aimed to study the stretching and shrinking ratio of poly(lactic acid)/ethylene vinyl acetate through reactive blends system for heat-shrinkable films application. The reactive agents, Joncryl® and Perkadox were used as in situ compatibilizers. PLA/EVA with 100/0, 97/3, 95/5, 93/7, and 90/10 ratios were prepared in the twin screw extruder. Neat PLA and PLA/EVA films were fabricated by blown film extrusion. The results revealed that the elongation at break of PLA in the TD direction was improved when adding EVA. PLA and EVA film with 0.1 phr of Perkadox was found to be sufficient as evident by FESEM micrograph and DMTA results. The films were stretched and shrunk at a temperature of 70 °C. The percentage of shrinkage of the stretched PLA/EVA reactive blend films, two and three times were, 100%, approximately. On the other hand, the four-times stretched films shrunk less than 100% because of the excessive stretching, which resulted in film breakage and defect.

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Section: Melt Flow Index Of Neat Pla and Pla/eva Blendsmentioning

confidence: 99%

“…The results show that the addition of Joncryl in PLA leads to an increase in the gel content from 0.33% to 2.78%. This is because Joncryl acts as a chain extender which reconnects the PLA chains [23]. Consequently, the larger macromolecules and the higher molecular weight of PLA structures were formed.…”

Section: Gel Contentmentioning

confidence: 99%

Development of PLA/EVA Reactive Blends for Heat-Shrinkable Film

et al. 2019

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“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 14 all, crosslinking PLA has already demonstrated to improve thermal stability 70,71 and toughness. 72,73 While the most common crosslinking of PLA is performed by post-polymerization irradiation with crosslinking agents [74][75][76] or with chain extenders, [77][78][79][80] we here propose a bottom-up synthesis of a unique crosslinked PLA (from the monomer level). The copolymerization was successfully performed in p-xylene using an azeotropic distillation for water removal, according to a literature procedure for PLA.…”

Section: Synthesis Of New Diester and Diacid Building Blocks Through mentioning

confidence: 99%

Synthesis of Novel Renewable Polyesters and Polyamides with Olefin Metathesis

Dewaele¹,

Meerten²,

Verbelen³

et al. 2016

ACS Sustainable Chem. Eng.

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Unsaturated and hydroxyl-functionalized C6-dicarboxylic acids were successfully synthesized via olefin metathesis from methyl vinyl glycolate (MVG), a renewable α-hydroxy C4-ester product from Lewisacid carbohydrate conversion. Addition of a second-generation Hoveyda-Grubbs catalyst to neat MVG leads to a near quantitative yield of dimethyl-2,5-dihydroxy-3-hexenedioate (DMDHHD). Additional hydrolysis and hydrogenation steps form interesting polymer building blocks like 2,5-dihydroxy-3hexenedioic acid (DHHDA) and 2,5-dihydroxyadipic acid (DHAA). Their use in polyester and polyamide synthesis is demonstrated after determination of their physical and spectroscopic characteristics. Copolymerization of DHHDA with L-lactic acid for instance produces a crosslinked poly(L-lactic acid-co-DHHDA) polyester. Proof of crosslinks is ascertained by NMR and FT-IR. Substantial impact on the melting, thermal and polar properties of PLA are observed already at low amounts of DHHDA (0.1 mol%) in accord with the presence of crosslinks in the polymer. Bio-based polyamides were also synthesized by equimolar reaction of DHHDA with hexamethylenediamine, producing a renewable polyamide analogue of the petroleum-based nylon 6,6. Interestingly, the assynthesized polyamide (α-bishydroxylated unsaturated polyamide, HUPA) possesses similar thermal stability as nylon 6,6 but shows different chemical properties as a result of the double bond and αhydroxy functionality.

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“…A less expensive and more practical strategy to overcome these drawbacks is the blending of PLA with other polymers. Hence, several synthetic polymers and copolymers such as, polyethylene [4,5], polypropylene (PP) [6,7], polystyrene [8,9], poly(ethylene terephtalate) [10,11], polycarbonate [12,13], polyamide [14,15], and acrylonitrile-butadiene-styrene (ABS) [16] or biodegradable polymers such as polycaprolactone [17,18], poly(butylene succinate) [19,20], poly(butylenes adipate-co-terephtalate) [21,22], thermoplastic starch [23,24], and poly(butylene succinate adipate) [25] have been used.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of PLA/PP/ABS ternary blend

Chaudry

Hamad

2019

Polymer Engineering & Sci

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In this study, we fabricated and studied properties of ternary polymer blends containing polylactic acid (PLA), polypropylene (PP), and acrylonitrile‐butadiene‐styrene (ABS). The melt rheology experiments showed that the present combination (PLA/PP/ABS) exhibited a melt process‐ability, which is comparable to those of individual components. The ternary blends prepared in this work can be exploited to fabricate hierarchically porous PLA materials for biomedical applications. POLYM. ENG. SCI., 59:2273–2278, 2019. © 2019 Society of Plastics Engineers

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Effect of chain extenders on thermal and mechanical properties of poly(lactic acid) at high processing temperatures: Potential application in PLA/Polyamide 6 blend

Cited by 84 publications

References 36 publications

Development of PLA/EVA Reactive Blends for Heat-Shrinkable Film

Development of PLA/EVA Reactive Blends for Heat-Shrinkable Film

Synthesis of Novel Renewable Polyesters and Polyamides with Olefin Metathesis

Fabrication and characterization of PLA/PP/ABS ternary blend

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