Disentanglement induced by uniaxial pre-stretching as a key factor for toughening poly( -lactic acid) sheets

Chen, Yunjing; Han, Lijing; Ju, Dandan; Liu, Tingting; Dong, Lisong

doi:10.1016/j.polymer.2018.02.032

Cited by 48 publications

(41 citation statements)

References 37 publications

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“…Chen et al. [ 43 ] obtained the disentangle poly(L‐lactide) (PLLA) sheet by uniaxial pre‐stretching technique at 60 °C. The product has high strength and modulus.…”

Section: Control Of Polymer Chain Entanglementmentioning

confidence: 99%

“…Chen et al. [ 43 ] discovered that when the pre‐stretching ratio was increased to 0.2, the network structure of cohesional entanglements was broken because of a large amount of disentanglement. Most of the destroyed cohesional entanglements could not recombine because the molecular chains began to orient in the strain hardening region, as shown in Figure .…”

Section: Control Of Polymer Chain Entanglementmentioning

confidence: 99%

See 1 more Smart Citation

Control of Polymer Properties by Entanglement: A Review

Kong

Yang

Zhang

et al. 2021

Macro Materials & Eng

104

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Chain entanglement, either cohesional or topological, distinguishes polymers from other engineering materials. It impedes the movement of molecular segments and influences the polymer rheology, morphology, and mechanical properties. Although a high level of entanglement can increase the polymer toughness, excessive entanglement should be avoided because it causes a high melt viscosity making the processing difficult. This review tended to elucidate the influence of entanglement on the polymer structure, determining the material properties and processability. A wide range of methods used to fine control the degrees of chain entanglement are summarized. The methods are applicable to polymers in solutions, melts, and condensed states with advantages and limitations discussed in detail. The authors also examined the effect of the entanglement on polymer crystallization—the mechanism remains a controversial issue. This review will provide general guidance to designing and processing polymer materials with desired properties via a rational route of controlling the chain entanglement.

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“…Chen et al. [ 43 ] obtained the disentangle poly(L‐lactide) (PLLA) sheet by uniaxial pre‐stretching technique at 60 °C. The product has high strength and modulus.…”

Section: Control Of Polymer Chain Entanglementmentioning

confidence: 99%

Section: Control Of Polymer Chain Entanglementmentioning

confidence: 99%

Control of Polymer Properties by Entanglement: A Review

Kong

Yang

Zhang

et al. 2021

Macro Materials & Eng

104

View full text Add to dashboard Cite

show abstract

“…Moreover, with the coming of finite element technique that is also based on elasticity formulations but is much faster, reasonably exact and commercially more applicable, study on classical elasticity procedures has to some extent lost the activity [7].…”

Section: Figure1 Structures For Aircraftmentioning

confidence: 99%

Experimental and modeling stress concentration factor (SCF) of a tension poly lactic acid (PLA) plate with two circular holes

Mohan¹,

Habeeb²,

Abood³

2019

PEN

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The design of high performance aircraft structures frequently includes various shape and size discontinuities for various purposes. The zones near to these notches become critical regions under various working loading. The stress concentration factor (SCF) and tensile strength degradation of poly lactic acid (PLA) plates are addressed in the current study through a combination of experimental and numerical studies using finite element (FE) modeling techniques. The present work performs stress concentration factor (SCF) of rectangular plates with two symmetrical circular holes under uniaxial tension load of two various types (PLA, PLA/15%carbon), which were determined in the current work experimentally and numerically using finite element method with help of Ansys software. The results of experimental test showed decay in tensile modulus and tensile strength is less than that of using plates without holes by (10%, 22.1%) for (PLA, PLA/15%carbon) respectively, and the apparent stress concentration factor is (3.33, 3.61) respectively. And showed decay in tensile strength is less than that of using plates without holes by (28.35%, 27.77%) for (PLA, PLA/15%carbon) respectively, due to the concentration of stresses around the holes. A finite element analysis is carried out and the outcomes have been estimated with experimental results for checking the efficient use of this article. The numerical results show the Von Mises stress distribution and stress concentration factor is (2.16, 2.35) for (PLA, PLA/15%carbon) respectively.

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“…In generally, toughening methods including blending modification, 18–20 copolymerization, 21 and even uniaxial stretching, 22 have been used to improve the toughness of polymer. Among them, blending modification, as a simple, economical and practical method, has attracted extensive attention, 23–26 which can be widely applied in large‐scale industrial production based on the laboratory research.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure, morphology, and mechanical properties of biaxially oriented polyamide‐6 films toughened with poly(ether block amide)

Lin

Cui

et al. 2021

Polymers for Advanced Techs

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Biaxially oriented polyamide‐6 (BOPA) film has been widely used in many packaging applications. However, the BOPA film with excellent toughness is still required when utilizing in the field of soft‐packaged lithium‐ion batteries, pharmaceutical blister packaging, or frozen food packaging especially for vacuum packaging of irregular‐shaped food products. The purpose of this study was to improve the toughness of BOPA films by toughening with poly(ether block amide) (PEBA) (BOPA/PEBA films) based on the simultaneous biaxial stretching technology. The crystal structure, morphology, optical properties, barrier, and mechanical properties of BOPA/PEBA films were investigated. The results showed that the incorporation of PEBA into BOPA films slightly decreased the melting temperature and crystallinity of PA6, and the BOPA/PEBA films exhibited only α‐form crystals and no preferential orientation in the machine direction (MD) and transition direction (TD). The morphological observation showed that higher addition of PEBA led to the formation of microvoids due to the poor compatibility between PA6 and PEBA. As a result, the transmittance and oxygen barrier properties of the BOPA/PEBA films decreased. In addition, mechanical analysis suggested that the addition of PEBA could effectively improve the toughness of BOPA film.

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Disentanglement induced by uniaxial pre-stretching as a key factor for toughening poly( -lactic acid) sheets

Cited by 48 publications

References 37 publications

Control of Polymer Properties by Entanglement: A Review

Control of Polymer Properties by Entanglement: A Review

Experimental and modeling stress concentration factor (SCF) of a tension poly lactic acid (PLA) plate with two circular holes

Crystal structure, morphology, and mechanical properties of biaxially oriented polyamide‐6 films toughened with poly(ether block amide)

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