A promising strategy for fabricating high-performance stereocomplex-type polylactide products via carbon nanotubes-assisted low-temperature sintering

He, Shiwen; Bai, Hongwei; Bai, Dongyu; Ju, Yilong; Zhang, Qin; Fu, Qiang

doi:10.1016/j.polymer.2018.12.032

Cited by 30 publications

(10 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dispersed emulsion was ultrasonicated for 15 min, heated to 80°C in an air drying oven and maintained the temperature for 5 h to remove any trace of H 2 O. After high‐speed stirring, 22 the mixed powders were compression molded into cylindrical pieces with different diameters (~ 25 mm and ~ 50 mm) at room temperature. Finally, these cylindrical pieces were sintered, the detailed procedure was as follows: The compressed samples were heated from room temperature to 375°C in a high temperature sintering chamber (SJX‐151, Taizhou Jinchi Power Equipment Co. LTD) at 1°C min −1 and then maintained for 30 min to allow PTFE particles coalesced completely.…”

Section: Methodsmentioning

confidence: 99%

Enhanced thermal conductivity and wear resistance of polytetrafluoroethylene via incorporating hexagonal boron nitride and alumina particles

Chen

Yao

et al. 2021

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

Polytetrafluoroethylene (PTFE) receives wide attention in electronic packaging materials due to its excellent dielectric properties, friction properties and thermal stability. However, its extremely low thermal conductivity limits its further application. In this work, hexagonal boron nitride (h-BN) platelets are added into PTFE matrix to improve the thermal conductivity as the expense of largely deteriorated friction property. To make up the loss of friction property, alumina particles (AO) are also added and the effects of filler ratio between h-BN and alumina on the thermal conductivity and tribological performance of PTFE composites are investigated. It is interesting to find that when the filler ratio of h-BN and alumina is fixed at 2:1, the through-plane and in-plane thermal conductivity of PTFE composite filled with 30 vol% hybrid filler can be increased to 1.544 Wm À1 K À1 and 2.029 Wm À1 K À1 (5.5 and 5.7 times that of PTFE), respectively. Furthermore, the coefficient of friction of PTFE composites only increases by 21.32% and the wear rate decreased by 48.09%, compared with that of PTFE. Our work demonstrates a facile method to achieve much improved thermal conductivity of PTFE while maintaining its excellent dielectric properties and friction properties by using hybrid filler of h-BN and AO.

show abstract

Section: Methodsmentioning

confidence: 99%

Enhanced thermal conductivity and wear resistance of polytetrafluoroethylene via incorporating hexagonal boron nitride and alumina particles

Chen

Yao

et al. 2021

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…(A) melt processing at a specific temperature window (Gao et al, 2019 ) (Reproduced with permission. Copyright 2017, Elsevier); (B) using homopolymer (He et al, 2019 ) (Reproduced with permission. Copyright 2016, Elsevier); (C) layer-by-layer inkjet printing (Mei et al, 2018 ) (Reproduced with permission.…”

Section: Melt Processing At Specific Temperature Windowmentioning

confidence: 99%

“…Introducing physical interactions between PLA and additives is also effective for enhancing the intermolecular packing of PLLA and PDLA chains. For example, in a miscible ternary polymer blend (PLLA/PDLA/polyvinyl phenol, or PVPh, Figure 2B ), an exclusive SC formation can be achieved by employing ~30 wt% of PVPh in the system (He et al, 2019 ). This significant improvement is attributed to the enhanced intermolecular interactions at the initial stage of SC crystallization due to hydrogen bonding interactions between PVPh and PLLA, which not only act as precursors for facilitating SC formation but also shorten the diffusion pathway of enantiomeric chains for crystal growth.…”

Section: Additive Manufacturingmentioning

confidence: 99%

Recent Progress in Enhancing Poly(Lactic Acid) Stereocomplex Formation for Material Property Improvement

et al. 2020

View full text Add to dashboard Cite

The production and utilization of polymers have been widely implemented into diverse applications that benefit modern human society, but one of the most valuable properties of polymers, durability, has posed a long-standing environmental challenge from its inception since plastic waste can lead to significant contamination and remains in landfills and oceans for at least hundreds of years. Poly(lactic acid) (PLA) derived from renewable resources provides a sustainable alternative to traditional polymers due to its advantages of comparable mechanical properties with common plastics and biodegradability. However, the poor thermal and hydrolytic stability of PLA-based materials limit their potential for durable applications. Stereocomplex crystallization of enantiomeric poly (l-lactide) (PLLA) and poly (d-lactide) (PDLA) provides a robust approach to significantly enhance material properties such as stability and biocompatibility through strong intermolecular interactions between L-lactyl and D-lactyl units, which has been the key strategy to further PLA applications. This review focuses on discussing recent progress in the development of processing strategies for enhancing the formation of stereocomplexes within PLA materials, including thermal processing, additive manufacturing, and solution casting. The mechanism for enhancing SC formation and resulting material property improvement enabled by each method are also discussed. Finally, we also provide the perspectives on current challenges and opportunities for improving the understanding of processing-structure-property relationship in PLA materials that could be beneficial to their wide practical applications for a sustainable society.

show abstract

“…Numerous potential nucleating systems have been examined in the literature, including “green” nucleating agents. PLA-based polymer composites and nanocomposites containing nanoclays [ 9 , 10 , 11 ], nanosilicas [ 12 , 13 ], carbon nanotubes [ 14 , 15 ], or graphene [ 16 ] are well known. Another class of additives for polylactide that can improve its crystallization rate are species that exploit supramolecular phenomena, e.g., hydrogen bonding or host-guest effects, to interact with PLA macromolecules (“soft templating”).…”

Section: Introductionmentioning

confidence: 99%

Supramolecular Interactions in Hybrid Polylactide Blends—The Structures, Mechanisms and Properties

Kowalewska

Nowacka

2020

Molecules

View full text Add to dashboard Cite

The conformation of polylactide (PLA) chains can be adjusted by supramolecular interactions (the formation of hydrogen bonds or host-guest complexes) with appropriate organic molecules. The structures formed due to those intermolecular interactions may act as crystal nuclei in the PLA matrix (“soft templating”). In this review, the properties of several supramolecular nucleating systems based on synthetic organic nucleators (arylamides, hydrazides, and 1,3:2,4-dibenzylidene-d-sorbitol) are compared to those achieved with biobased nucleating agents (orotic acid, humic acids, fulvic acids, nanocellulose, and cyclodextrins) that can also improve the mechanical properties of PLA. The PLA nanocomposites containing both types of nucleating agents/additives are discussed and evaluated in the context of their biomedical applicability.

show abstract

A promising strategy for fabricating high-performance stereocomplex-type polylactide products via carbon nanotubes-assisted low-temperature sintering

Cited by 30 publications

References 49 publications

Enhanced thermal conductivity and wear resistance of polytetrafluoroethylene via incorporating hexagonal boron nitride and alumina particles

Enhanced thermal conductivity and wear resistance of polytetrafluoroethylene via incorporating hexagonal boron nitride and alumina particles

Recent Progress in Enhancing Poly(Lactic Acid) Stereocomplex Formation for Material Property Improvement

Supramolecular Interactions in Hybrid Polylactide Blends—The Structures, Mechanisms and Properties

Contact Info

Product

Resources

About