Isotropically small crystalline lamellae induced by high biaxial-stretching rate as a key microstructure for super-tough polylactide film

Jariyasakoolroj, Piyawanee; Tashiro, Kohji; Wang, Hai; Yamamoto, Hiroko; Chinsirikul, Wannee; Kerddonfag, Noppadon; Chirachanchai, Suwabun

doi:10.1016/j.polymer.2015.05.006

Cited by 82 publications

(79 citation statements)

References 42 publications

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“…But, the 〈 L 〉 200/110 decreased obviously to 80–100 nm when stretching rates increased to 16, 37, and 75 mm s −1 (Figure B, circle), the smaller PLA crystal formation by faster stretching in BO‐PLA/TPS film is similar to that of BOPLA film. However, it is noticed that the 〈 L 〉 200/110 of BO‐PLA/TPS is larger than that of BOPLA (65 nm) under the same processing conditions, as previously reported . It was worth mentioning that nucleating role of TPS dominantly favored the strain‐induced PLA crystallization.…”

Section: Resultssupporting

confidence: 73%

“…According to the previous study, the amorphous phase mainly exhibited in PLA precursor sheet . But, after blending PLA with TPS, the broad diffraction peak at 19.57° 2θ is observed in Figure , assigned to V H ‐type of TPS.…”

Section: Resultsmentioning

confidence: 68%

“…Recently, we established the relationship between the drastic mechanical properties improvement and the specific BOPLA microstructure which was simply manipulated by adjusting draw ratio and stretching rate during simultaneously biaxial orientation process. A lot of small δ‐crystallites of PLA with isotropic orientation is the key to access the super‐tough PLA film by applying high stretching rate and high draw ratio (75 mm s −1 and 5 × 5, respectively) …”

Section: Introductionmentioning

confidence: 99%

“…A lot of small δ-crystallites of PLA with isotropic orientation is the key to access the super-tough PLA film by applying high stretching rate and high draw ratio (75 mm s −1 and 5 × 5, respectively). [21] Until now, few studies have demonstrated the microstructural analyses for molecular orientation of BOPLA incorporated with other components. For example, Chapleau et al studied morphology and mechanical properties of BO-PLA/TPS films.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Analyses of Biaxially Oriented Polylactide/Modified Thermoplastic Starch Film with Drastic Improvement in Toughness

Jariyasakoolroj

Tashiro

Chinsirikul

et al. 2019

Macro Materials & Eng

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This study presents microstructural regularization of biaxially oriented polylactide blended with a silane‐modified thermoplastic starch (BO‐PLA/mTPS) film, traced by X‐ray diffraction and scattering, and differential scanning calorimetry techniques. Interfacial adhesion improvement of mTPS favors PLA crystallization, and produces a large δ‐crystal (100–150 nm) with isotropic orientation when combining with BO stretching. High draw ratio (5 × 5), and BO stretching rate (75 mm s−1) lead to tight packing of PLA lamellae in both BO‐PLA/TPS and BO‐PLA/mTPS films, resulting in drastic toughness improvement (i.e., fivefold increases of Young's modulus and tensile strength, and threefold increase of elongation, as compared to those of the films without the BO process) with significantly decreased water absorption. However, the effect of reactive compatibility by mTPS on mechanical and water barrier properties is hindered by the BO process in which the VH‐type patterns of TPS and mTPS are unclearly present, overlapped with (203) diffraction plane of PLA crystal, especially applying fast stretching.

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructural Analyses of Biaxially Oriented Polylactide/Modified Thermoplastic Starch Film with Drastic Improvement in Toughness

Jariyasakoolroj

Tashiro

Chinsirikul

et al. 2019

Macro Materials & Eng

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“…and Xiao et al . this endothermic overshoot is related to the enthalpy relaxation of a deformed amorphous phase, which may be produced during the film processing due to the cooling from above to below T g , for the PLA present in the sample, and the deformation induced during the film stretching, by the rollers set …”

Section: Resultsmentioning

confidence: 99%

A new approach for flexible PBAT/PLA/CaCO₃ films into agriculture

Rocha

Carvalho

Oliveira

et al. 2018

J of Applied Polymer Sci

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The use of flexible films in agriculture has increased intensely in the last 15 years bringing benefits to producers. However, environmental impacts increased due to their incorrect post‐use disposal which leads the degradable films to emerge as an alternative. The production films of poly(butylene adipate‐co‐terephthalate) and poly(lactic acid) reinforced with calcium carbonate (CaCO3) was studied focusing on producing lower cost materials and flexible films. Four different films (reinforcement compositions) were prepared by melt extrusion with 10 and 20 wt % of CaCO3. Mechanical and thermal properties, crystallinity, water absorption, and soil degradation, were evaluated. The addition of reinforcement leads to improved compatibility between the polymers in the matrix, which usually presented phase segregation. The films showed better mechanical properties with the addition of CaCO3. Highly orientated amorphous structures were obtained leading to low water absorption and low degradation in the simulated soil. This low degradation, suggests that the obtained films would be of interest in flexible mulch films manufacturing, particularly for Muridori plantation system, where long‐term plantations are needed. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46660.

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Biocatalytic Degradation Efficiency of Postconsumer Polyethylene Terephthalate Packaging Determined by Their Polymer Microstructures

et al. 2019

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Polyethylene terephthalate (PET) is the most important mass‐produced thermoplastic polyester used as a packaging material. Recently, thermophilic polyester hydrolases such as TfCut2 from Thermobifida fusca have emerged as promising biocatalysts for an eco‐friendly PET recycling process. In this study, postconsumer PET food packaging containers are treated with TfCut2 and show weight losses of more than 50% after 96 h of incubation at 70 °C. Differential scanning calorimetry analysis indicates that the high linear degradation rates observed in the first 72 h of incubation is due to the high hydrolysis susceptibility of the mobile amorphous fraction (MAF) of PET. The physical aging process of PET occurring at 70 °C is shown to gradually convert MAF to polymer microstructures with limited accessibility to enzymatic hydrolysis. Analysis of the chain‐length distribution of degraded PET by nuclear magnetic resonance spectroscopy reveals that MAF is rapidly hydrolyzed via a combinatorial exo‐ and endo‐type degradation mechanism whereas the remaining PET microstructures are slowly degraded only by endo‐type chain scission causing no detectable weight loss. Hence, efficient thermostable biocatalysts are required to overcome the competitive physical aging process for the complete degradation of postconsumer PET materials close to the glass transition temperature of PET.

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Isotropically small crystalline lamellae induced by high biaxial-stretching rate as a key microstructure for super-tough polylactide film

Cited by 82 publications

References 42 publications

Microstructural Analyses of Biaxially Oriented Polylactide/Modified Thermoplastic Starch Film with Drastic Improvement in Toughness

Microstructural Analyses of Biaxially Oriented Polylactide/Modified Thermoplastic Starch Film with Drastic Improvement in Toughness

A new approach for flexible PBAT/PLA/CaCO₃ films into agriculture

Biocatalytic Degradation Efficiency of Postconsumer Polyethylene Terephthalate Packaging Determined by Their Polymer Microstructures

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Isotropically small crystalline lamellae induced by high biaxial-stretching rate as a key microstructure for super-tough polylactide film

Cited by 82 publications

References 42 publications

Microstructural Analyses of Biaxially Oriented Polylactide/Modified Thermoplastic Starch Film with Drastic Improvement in Toughness

Microstructural Analyses of Biaxially Oriented Polylactide/Modified Thermoplastic Starch Film with Drastic Improvement in Toughness

A new approach for flexible PBAT/PLA/CaCO3 films into agriculture

Biocatalytic Degradation Efficiency of Postconsumer Polyethylene Terephthalate Packaging Determined by Their Polymer Microstructures

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A new approach for flexible PBAT/PLA/CaCO₃ films into agriculture