Preparation and characterization of compatibilized and toughened polylactic acid/cellulose acetate films by long‐chain hyperbranched polymers

Huang, Yansong; Jin, Yang; Wang, Bo; Tian, Huafeng; Weng, Yunxuan; Sun, Kangdi; Men, Shuang

doi:10.1002/app.52097

Cited by 6 publications

(2 citation statements)

References 60 publications

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“…With the rapid growth of wireless communication demand, the problem of EM radiation generated by booming portable devices has attracted much attention. , This unnecessary EM radiation can impair the functionality and lifespan of appliances and cause surrounding electronics or components to malfunction or even affect human health. − Therefore, existing and future wireless technologies urgently need appropriate shielding materials in order to preserve human health and efficiently shield equipment from hazardous radiation to prevent performance deterioration. − …”

Section: Introductionmentioning

confidence: 99%

Efficient Electromagnetic Interference Shielding of PPA6@NiM/PDMS Composites with Porous and Asymmetric Gradient Structures

Zhu

et al. 2023

ACS Appl. Polym. Mater.

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In this work, magnetic PA6 microspheres (PPA6@ NiM) with porous structures were prepared using the solvent coprecipitation method and electroless nickel plating technology, and the stacked magnetic microspheres were encapsulated with polydimethylsiloxane (PDMS) to obtain PPA6@NiM/PDMS composites. The existence of the porous structure increases the attenuation path of the electromagnetic wave, and the presence of the nickel layer improves the magnetic loss of the composite material to the electromagnetic wave and synergistically improves the absorption of the electromagnetic wave. Among them, the total shielding effectiveness (SET) of the PPA6@NiM4/PDMS composite is as high as 39.9 dB, and the reflection coefficient (R) is 0.83. To further increase the absorption effect of the composite material, an asymmetric gradient structure was constructed by utilizing the difference in electrical conductivity between the magnetic microspheres. The electromagnetic wave is incident from the surface with lower conductivity (impedance matching layer). It is reflected by the consistency with higher conductivity (strong reflective layer) than the bottom layer to increase the loss of electromagnetic waves inside the material. The composite SET constructed with M1 and M4 particles with the most significant difference in conductivity achieved 35.5 dB with an absorption coefficient (A) of 0.42. It shows that the porous combined asymmetric gradient structure we designed can effectively improve the shielding efficiency and absorption capacity of the composite material against electromagnetic microwaves and serve as a reference for creating high-absorbing and high-performance electromagnetic shielding materials.

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Section: Introductionmentioning

confidence: 99%

Efficient Electromagnetic Interference Shielding of PPA6@NiM/PDMS Composites with Porous and Asymmetric Gradient Structures

Zhu

et al. 2023

ACS Appl. Polym. Mater.

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“…The difficult natural degradation of traditional petroleum-based polymers is leading to a large amount of plastic pollution which causes damage to the environment [1,2]. Recently, the research on environmentally friendly and sustainable green materials has attracted more and more attention.…”

Section: Introductionmentioning

confidence: 99%

Poly(lactic acid) toughen by aromatic sulfonamide toward balanced rheology processing and mechanical properties

Chu¹,

Yan²,

Cai³

et al. 2022

Mater. Res. Express

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The inherent brittleness of poly(lactic acid) (PLA) usually limits its application in the high ductile requirements sector. To address the above issue, n-ethyl-p-toluenesulfonamide (N-PTSA) as the toughening agent, was utilized to optimize the rheological and mechanical performance of the PLA matrix. The microstructure, thermal stability, rheological behavior, and mechanical properties of PLA/N-PTSA were systematically investigated. A rheological test showed that N-PTSA can reduce the melt processing viscosity of PLA matrix and the decreasing of processing viscosity strongly depended on the N-PTSA content rather than shear rate. Mechanical properties results confirmed that the 14.7% N-PTSA can improve the toughness of PLA/N-PTSA without deteriorating the tensile strength and Yong’s modulus. This reason was ascribed to the reduction of hydrogen bonds of PLA matrix caused by N-PTSA to accelerate the movement of PLA molecular chain meanwhile forming new hydrogen bond between PLA and N-PTSA. By adding N-PTSA, the thermal stability of PLA was decreased. With the synergistic effect of plasticizing and toughening N-PTSA, the rheology and mechanical properties of PLA had been effectively improved.

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Combination of polylactide with cellulose for biomedical applications: a recent overview

Kopańska,

Brzeziński,

Draczyński

2023

Cellulose

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This review summarizes the use of cellulose and polylactide for medical applications with particular emphasis on modern dressings. Although classic cotton and viscose dressings are still available and popular, the usefulness of new forms of cellulose (Cel) and its derivatives opens new wound treatment options. Therefore, trends in functionalizing traditional cellulose dressings, including products made of bacterial cellulose, and dressings from cellulose derivatives, are discussed. Polylactide (PLA), in turn, is a biodegradable and biocompatible polyester that fulfills plenty of tasks in many medical fields, from surgery to modern diagnostic methods. However, polylactide dressings can still be advantageous to the market. Thus, the next part of the article contains a recent update of available knowledge about PLA and its applications in regenerative medicine and drug-delivery systems. The last part is devoted to the possibilities of combining both materials in dressings and related problems and benefits. Methods for compatibilization with the surface of both polymers and new techniques for producing Cel/PLA composite materials are also described.

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Preparation and characterization of compatibilized and toughened polylactic acid/cellulose acetate films by long‐chain hyperbranched polymers

Cited by 6 publications

References 60 publications

Efficient Electromagnetic Interference Shielding of PPA6@NiM/PDMS Composites with Porous and Asymmetric Gradient Structures

Efficient Electromagnetic Interference Shielding of PPA6@NiM/PDMS Composites with Porous and Asymmetric Gradient Structures

Poly(lactic acid) toughen by aromatic sulfonamide toward balanced rheology processing and mechanical properties

Combination of polylactide with cellulose for biomedical applications: a recent overview

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