Structures and properties of waste silicone cross‐linked polyethylene de‐cross‐linked selectively by solid‐state shear mechanochemical technology

Sun, Fasen; Bai, Shibing; Wang, Qi

doi:10.1002/vnl.21636

Cited by 23 publications

(25 citation statements)

References 40 publications

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“…Gel fraction was usually used to characterize the cross-linking degree of polymers. 35 Considered on the chemical reaction between PLA and SAG, the gel fraction of various PLA samples is measured and summarized in Table 1. It could be seen from Table 1 that the gel fraction of various PLA samples increased gradually with the increment in SAG contents, which would be helpful to improve the viscoelasticity of PLA.…”

Section: Resultsmentioning

confidence: 99%

Nanocellular Foaming Behaviors of Chain-Extended Poly(lactic acid) Induced by Isothermal Crystallization

et al. 2019

ACS Omega

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Recently, the fabrication of semicrystalline polymer foams with a nanocellular structure by supercritical fluids has been becoming a newly developing research hotspot, owing to their peculiar properties and prospective applications. In this work, a facile and effective isothermal crystallization-induced method was proposed to prepare nanocellular semicrystalline poly(lactic acid) (PLA) foams using CO 2 as a physical blowing agent. Styrene–acrylonitrile–glycidyl methacrylate (SAG) as a chain extender (CE) was introduced into PLA through a melt-mixing method to improve the crystallization behavior and melt viscoelasticity of PLA. The chain extension reaction between PLA and SAG occurred successfully as well as the branching and micro cross-linking structures were generated in chain-extended PLA (CPLA) samples, which were confirmed by Fourier transform infrared spectra, gel fraction, and intrinsic viscosity measurements. Owing to the nucleation effect of branching points and the restricted movement of PLA molecular chains by the formation of branching and/or microcross-linking structures, a large number of small spherocrystals were generated in CPLA samples, which was beneficial to produce nanocells. Nanocellular CPLA foams were prepared successfully, when the foaming temperature was 125 °C. As the SAG content increased, the cell size of various PLA foams decreased from 364 ± 198 to 249 ± 100 nm and their volume expansion ratio increased from 1.15 ± 0.05 to 2.22 ± 0.01 times, gradually. When the foaming temperature increased from 125 to 127 °C, an interesting transition from nanocells to microcells could be observed in CPLA foam with the CE content of 2 wt %. Finally, the formation mechanism of nanocells in various PLA foams was proposed and clarified using a schematic diagram.

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Section: Resultsmentioning

confidence: 99%

Nanocellular Foaming Behaviors of Chain-Extended Poly(lactic acid) Induced by Isothermal Crystallization

et al. 2019

ACS Omega

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“…The crosslinking degree of polymers played an important role in their foaming behaviors, which also could provide an indirect proof for the chain extension . Micro crosslinking in PBS was helpful to improve its melt strength and viscoelasticity, but excessive crosslinking structures in PBS would have a negative effect on the cell nucleation and growth in the PBS foaming process and the degradation of PBS .…”

Section: Resultsmentioning

confidence: 99%

Simple and feasible strategy to fabricate microcellular poly(butylene succinate) foams by chain extension and isothermal crystallization induction

Yin

Zhou

et al. 2019

J of Applied Polymer Sci

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In this article, a facile and efficient isothermal crystallization induction method was proposed to fabricate microcellular poly(butylene succinate) (PBS) foams with supercritical CO2. The good regularity of PE chain segments and high reactive epoxy groups in ethylene‐glycidyl methacrylate copolymer (PE‐g‐GMA) serving as a chain extender were employed to improve the crystallization behaviors, viscoelasticity, and foaming behaviors of PBS through chain extension reaction. The effect of PE‐g‐GMA content on the thermal properties, rheological performances, and cellular morphology of various PBS samples was investigated systematically. When the PE‐g‐GMA content switched from 7.5 to 10 wt %, an interesting transition from fine cells to microcells was observed in PBS/PE‐g‐GMA foams. Microcellular PBS foam modified by 10 wt % PE‐g‐GMA was successfully prepared at the foaming temperature of 87 °C and the induction time of 7 min, in which its cell size and cell density could reach 6.63 ± 1.93 μm and 3.75 × 109 cells cm−3, respectively. The formation of abundant but tiny spherocrystals in chain extended PBS samples made a considerable contribution for preparing microcellular PBS foams. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48850.

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“…After milling treatment, they increased to 10.85 MPa and 10.99% due to excellent dispersion and small phase size (Figure 2I). 34,35 The interfacial contact area between the particles increased due to the particle…”

Section: Electrical Insulation Of Appw/eg 3d Printed Partsmentioning

confidence: 99%

Green recycling of aluminum plastic packaging waste by solid‐state shear milling and 3D printing for thermal conductive composites

Wei

Yang

Wang

2021

Polymers for Advanced Techs

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Aluminum-plastic packaging is a multilayer material composed of polymer and aluminum, which has been applied in food, medical, and other fields, due to the excellent fresh-keeping and barrier performance. However, it is difficult to recycle aluminumplastic packaging waste (APPW) due to the complicated components and the low value of reclaim products. This paper reports a green way to recycle the APPW by solid-state shear milling (S 3 M) technology and then fabricate APPW/expandable graphite (EG) composite parts with high thermal conductivity by fused deposition modeling (FDM) process. After the S 3 M treatment, the ultrafine APPW powder with the size of 7 $ 8 um was obtained, and it showed excellent processibility and the APPW/EG composite parts were successfully processed by FDM technology. The APPW/EG three-dimensional (3D) printed parts showed excellent mechanical and heat transfer performance along the stretch direction (0 ), where the tensile strength and thermal conductivity reached 13.58 MPa and 2.71 W/mK for APPW/EG (80/20) composites, respectively, much higher than those of pure APPW composite (7.71 MPa and 0.62 W/mK). Theoretical calculations showed that the interfacial thermal resistances of APPW/EG 3D printed parts with aligned fillers were lower than other samples. Furthermore, the APPW/EG composites with 20 wt.% EG loading showed a low electrical conductivity of 10 −10 S/cm because the oxidation layer was formed on the surface of Al flakes during the S 3 M process, which can be used in the thermally conductive insulating field. The new strategy presented in this work provides a new sight to recycle APPW for value-add material.

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Structures and properties of waste silicone cross‐linked polyethylene de‐cross‐linked selectively by solid‐state shear mechanochemical technology

Cited by 23 publications

References 40 publications

Nanocellular Foaming Behaviors of Chain-Extended Poly(lactic acid) Induced by Isothermal Crystallization

Nanocellular Foaming Behaviors of Chain-Extended Poly(lactic acid) Induced by Isothermal Crystallization

Simple and feasible strategy to fabricate microcellular poly(butylene succinate) foams by chain extension and isothermal crystallization induction

Green recycling of aluminum plastic packaging waste by solid‐state shear milling and 3D printing for thermal conductive composites

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