Superior low-temperature mechanical toughness of the PP-based blown micro/nano layer films

Hong, Weiyouran; Ran, Lanbin; Yu, Guiying; Qin, Jingxian; Ma, Baijun; Wu, Hong; Guo, Shaoyun; Li, Chunhai

doi:10.1016/j.polymer.2022.125257

Cited by 8 publications

(3 citation statements)

References 49 publications

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“…Many methodologies have been developed to produce nanolayer films so far, including layer-by-layer multilayers from polymer solutions or melts, , self-assembly of block copolymers, and the cast film of nanolayer coextrusion . Among them, the cast film of nanolayer coextrusion has attracted great attention in the scientific community due to its scalability, solvent-free nature, and cost-efficiency. ,, The cast film of nanolayer coextrusion includes nanolayer coextrusion and cast die, two main parts. The concept of the layer multiplying process in nanolayer coextrusion is shown in Figure A, where the initial two melt streams (sometimes more than two) coming from different feeding devices (extruders, melt pumps, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…26 Among them, the cast film of nanolayer coextrusion has attracted great attention in the scientific community due to its scalability, solvent-free nature, and cost-efficiency. 1,3,26 The cast film of nanolayer coextrusion includes nanolayer coextrusion and cast die, two main parts. The concept of the layer multiplying process in nanolayer coextrusion is shown in Figure 1A, where the initial two melt streams (sometimes more than two) coming from different feeding devices (extruders, melt pumps, etc.)…”

Section: ■ Introductionmentioning

confidence: 99%

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Development of Nanolayer Blown Film Technology

Hong

Ran

et al. 2022

Ind. Eng. Chem. Res.

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Nanolayer films are monolithic films including 30−1000 periodic alternating layers, each layer having a thickness of 20−5000 nm. Owing to the superlattice multilayer configuration, nanolayer films usually show outstanding mechanical, barrier, and optical properties and thus have broad application prospects in the film industry. This work develops a nanolayer blown technology by combining a blown die and layer multiplication concepts, which can produce blown films with 1000+ layers and thickness below 10 μm. In detail, planar nanolayers were first produced via a flat-die layer multiplication coextrusion, wrapped into annular profiles by using a well-designed custom-made blown die, and then were blown up into the bubble to obtain the nanolayer films. Experimental verifications show that nanolayer films with 1000+ layers can be easily fabricated by using this technique. Consequently, this effort may be a breakthrough in blown film technology and thus provides some positive effects on the film industry.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Development of Nanolayer Blown Film Technology

Hong

Ran

et al. 2022

Ind. Eng. Chem. Res.

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“…Conversely, many semicrystalline thermoplastics, especially polyolefin with a high degree of crystallinity (>40%) such as polyethylene (PE) and polypropylene (PP), are challenging to be processed by means of MEAM, although they possess outstanding mechanical properties, low price and good chemical resistance. [5][6][7] Severe shrinkage and warpage are major obstacle to the successful processability of PP materials by MEAM. 8,9 Hence, it is imperative to explore effective ways for solving the bottleneck and fully understand the underlying mechanisms, in order to exploit their use in functional parts and high-performance applications.…”

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confidence: 99%

Direct relationship between crystalline structure and part deformation of polypropylene copolymer parts fabricated by material extrusion additive manufacturing

Ju,

Gao,

et al. 2023

Journal of Polymer Science

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The high crystallinity and fast crystallization rate of polypropylene (PP) often result in severe warpage of final parts prepared by means of material extrusion additive manufacturing (MEAM). In this work, the effect of bed temperature (Tb) and nozzle temperature (Tn) on the dimensional accuracy and mechanical property of MEAM‐printed PP copolymer parts was investigated. It is found that raising Tb and Tn could significantly reduce the warpage of PP parts by regulating the crystallization behavior of PP. Specially, the amount of γ‐crystal grows obviously while the total crystallinity remains unchanged, as Tb or Tn increases. Moreover, the more the content of γ‐crystal, the lower the warpage height of PP samples is. Hence, a close correlation between the content of γ‐crystal and part deformation of MEAM‐printed PP parts is successfully established. This is mainly related to the large rigidity of γ‐crystal, which significantly reduces the volume shrinkage of PP during MEAM process. Besides, the raise of Tb or Tn also enhances the tensile strength, modulus and the elongation at break of PP parts. This wok provides an effective and convenient method for the manufacture of PP parts with good dimensional accuracy and excellent mechanical properties by means of MEAM techniques.

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Development of isotactic polypropylene‐based 3D printing materials with good dimensional accuracy and excellent impact properties

Shen,

Gao,

Luo

2024

Journal of Polymer Science

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The main challenge of fused deposition modeling (FDM) is the limited variety of commercially available semicrystalline polymer materials. Isotactic polypropylene (iPP), with a fast crystallization rate and high crystallinity, tends to undergo extensive volumetric shrinkage during the FDM process, further inducing severe deformation and poor dimensional accuracy in 3D‐printed parts. This study aims to develop desirable iPP‐based materials for the FDM technique through physically blending iPP and thermoplastic polyester elastomer (TPEE). TPEE retards the nonisothermal crystallization ability of iPP, as indicated by the significant decrease in crystallinity (Xc) from 47.7% for neat iPP to 28.5% for the iPP blend at a weight ratio of 30/70. The suppressed crystallization behavior accounts for a drastic decrease in the warpage degree of the 3D‐printed parts. The greater the content of TPEE is, the lower warpage the 3D‐printed parts have. Additionally, the presence of TPEE slightly influences the shear viscosity of iPP. As a result, iPP blends exhibit excellent extrudability during a typical FDM process. TPEE also enhances the impact strength of 3D‐printed parts by 168% compared to that of injection‐molded iPP. Taken together, the iPP blends developed in this work are promising FDM feedstock materials with good dimensional accuracy and excellent impact strength.

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Superior low-temperature mechanical toughness of the PP-based blown micro/nano layer films

Cited by 8 publications

References 49 publications

Development of Nanolayer Blown Film Technology

Development of Nanolayer Blown Film Technology

Direct relationship between crystalline structure and part deformation of polypropylene copolymer parts fabricated by material extrusion additive manufacturing

Development of isotactic polypropylene‐based 3D printing materials with good dimensional accuracy and excellent impact properties

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