Crystallization of linear low density polyethylene under two-dimensional confinement in high barrier blend systems

Zhang, Guojun; Xu, Haiqing; MacInnis, Kari; Baer, E.

doi:10.1016/j.polymer.2014.10.040

Cited by 6 publications

(5 citation statements)

References 28 publications

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“…A single‐screw extruder having a screw diameter of 1 inch and aspect ratio of 25 was connected to a melt pump and feed‐block. A 3‐inch wide film‐casting die was used to fabricate the thin films having a thickness of ~100 μm 21 . The films were collected on a take‐off chill roll in order to maintain a uniform and constant thickness.…”

Section: Methodsmentioning

confidence: 99%

“…A 3-inch wide film-casting die was used to fabricate the thin films having a thickness of $100 μm. 21 The films were collected on a take-off chill roll in order to maintain a uniform and constant thickness. An unplasticized PVAc control sample was also produced under similar processing conditions to provide a PVAc film having comparable thermal history to that of the blend films.…”

Section: Fabrication Of Shape Memory Blend Filmsmentioning

confidence: 99%

“…PVAc can be easily plasticized to significantly extend the range of applications. Plasticizers reduce the T g of polymers 18–21 …”

Section: Introductionmentioning

confidence: 99%

“…Plasticizers reduce the T g of polymers. [18][19][20][21] This work investigates the effect of plasticization on the properties of PVAc/PEG blend films at various PEG compositions. Differential scanning calorimetry (DSC) was carried out in order to evaluate the thermal behavior and to identify the switching temperature of the shape memory polymer blends.…”

Section: Introductionmentioning

confidence: 99%

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Programming of micro/nano‐scale information on low switching temperature shape memory film

Zhang

Sun

et al. 2022

J of Applied Polymer Sci

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Shape memory polymer films have been of great interests in storing functional information because of their optical and mechanical variability. High molecular weight polyvinyl acetate (PVAc) is an ideal shape memory material to program micro‐ and nano‐scale patterns on the surface of highly transparent films. By blending PVAc with polyethylene glycol (PEG) plasticizer, lower switching temperatures could be achieved. We develop a shape memory PVAc/PEG blend film system featuring a unique design by taking advantage of multiple switching temperatures. The effect of the PEG composition was studied relative to different surface patterns, switching temperatures and efficiency of information retrieval by utilizing differential scanning calorimetry and UV/Vis analysis. The results indicate that higher contents of PEG enhanced the recovery efficiency of both the micro‐scale and nano‐scale patterns and the corresponding optical properties. Furthermore, a dual switching shape memory film was developed enabling multiple switching temperatures that can lead to versatile applications.

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Section: Methodsmentioning

confidence: 99%

Section: Fabrication Of Shape Memory Blend Filmsmentioning

confidence: 99%

“…PVAc can be easily plasticized to significantly extend the range of applications. Plasticizers reduce the T g of polymers 18–21 …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Programming of micro/nano‐scale information on low switching temperature shape memory film

Zhang

Sun

et al. 2022

J of Applied Polymer Sci

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“…In particular, it was observed that coextruding PEO, PCL or polypropylene (PP) between hard confining layers led to unique single crystalline lamellas oriented parallel to the layers (in-plane). − Because the impermeable lamellas with large aspect ratios were oriented perpendicularly to the permeant flux, multiple orders of magnitude reduction in gas permeability was achieved compared with the bulk. The orientation of crystals is thus an important parameter, and many reports exist on the subject. − However, results were often behind expectation. ,,, Amorphous-phase dynamics play also a decisive role in the overall barrier properties. In the case of PLA, this was studied in the last years by several groups − , and summarized in the recent review of Sonchaeng et al However, the impact of confinement of PLA between the hard walls of a second glassy polymer on the barrier properties in such a context has not been studied yet.…”

Section: Introductionmentioning

confidence: 99%

Impact of Nanoconfinement on Polylactide Crystallization and Gas Barrier Properties

Nassar

Delpouve

Sollogoub

et al. 2020

ACS Appl. Mater. Interfaces

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The barrier properties of poly(L-lactide) (PLLA) were investigated in multinanolayer systems, probing the effect of confinement, the compatibility between the confining and the confined polymer, crystal orientation, and amorphous phase properties. The multilayer coextrusion process was used to confine PLLA between two amorphous polymers (polystyrene, PS; and polycarbonate, PC), which have different chemical affinities with PLLA. Confined PLLA layers of approximately 20 nm thickness were obtained. The multinanolayer materials were annealed at different temperatures to obtain PLLA crystallites with distinct polymorphs. PLLA annealed in PC/PLLA films at 120°C afforded a crystallinity degree up to 65%, and PLLA annealed in PC/PLLA or PS/PLLA films at 85°C had a crystallinity degree of 45%. WAXS measurements evidenced that the PLLA lamellas between PS layers had a mixed in-plane and on-edge orientation. PLLA lamellas between PC layers were uniquely oriented in-plane. DMA results evidenced a shift of the PC glass transition toward lower temperature, suggesting the possible presence of an interphase. The development of the rigid amorphous fraction (RAF) in the amorphous phase during annealing was impacted by the confiner polymer. The RAF content of semicrystalline PLLA was about 15% in PC/ PLLA, whereas it was neglectable in PS/PLLA. The oxygen barrier properties appeared to be governed by RAF content, and no impact of the PLLA polymorph or the crystalline orientation was observed. This study shows that the confinement of PLLA on itself does not impact barrier properties but that the proper choice of the confiner polymer can lead to decrease the phase coupling which creates the RAF. It is the prevention of RAF that decreases permeability.

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Dual Effects of Interfacial Interaction and Geometric Constraints on Structural Formation of Poly(butylene terephthalate) Nanorods

et al. 2022

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Crystallization of linear low density polyethylene under two-dimensional confinement in high barrier blend systems

Cited by 6 publications

References 28 publications

Programming of micro/nano‐scale information on low switching temperature shape memory film

Programming of micro/nano‐scale information on low switching temperature shape memory film

Impact of Nanoconfinement on Polylactide Crystallization and Gas Barrier Properties

Dual Effects of Interfacial Interaction and Geometric Constraints on Structural Formation of Poly(butylene terephthalate) Nanorods

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