Toward high-performance poly(para-phenylene terephthalamide) (PPTA)-based composite paper via hot-pressing: the key role of partial fibrillation and surface activation

Lu, Zhaoqing; Dang, Wanbin; Zhao, Yongsheng; Wang, Lamei; Zhang, Meiyun; Liu, Guodong

doi:10.1039/c7ra00052a

Cited by 29 publications

(16 citation statements)

References 50 publications

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“…Among these, the recent report of a novel ratiometric AIE‐probe, TPE‐TLE shows some excellent fluorescent properties. [ 152 ] Ratiometric fluorescence sensing is a specific setting owing to its excellent sensitivity, inherent reliability, and self‐calibration properties that enable them to analyze the biological molecules precisely. TPE‐TLE is an excellent H 2 O 2 ‐specific photostable probe with better cellular permeability, distinct emission peaks, higher sensitivity, and lower cytotoxicity.…”

Section: Current Methods and Their Relevance To Ros Studiesmentioning

confidence: 99%

Microalgae‐Derived Health Supplements to Therapeutic Shifts: Redox‐Based Study Opportunities with AIE‐Based Technologies

Reza

Zhu

Qin

et al. 2021

Adv Healthcare Materials

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Reactive oxygen species (ROS) are highly reactive molecules, serve the normal signaling in different cell types. Targeting ROS as the chemical signals, different stress based strategies have been developed to synthesis different anti‐inflammatory molecules in microalgae. These molecules could be utilized as health supplements in human. To provoke the ROS‐mediated defence systems, their connotation with the associated conditions must be well understood, therefore, proper tools for studying ROS in natural state are essential. The in vivo detection of ROS with phosphorescent probes offers promising opportunities to study these molecules in a non‐invasive manner. Most of the common problems in the traditional fluorescent probes are lower photostability, excitation intensity, slow responsiveness, and the microenvironment that challenge their performance. Some ROS‐specific aggregationinduced emission luminogens (AIEgens) with pronounced spatial and temporal resolution have recently demonstrated high selectivity, rapid responsiveness, and efficacies to resolve the aggregation‐caused quenching issues. The nanocomposites of some AIE‐photosensitizers can also improve the ROS‐mediated photodynamic therapy. These AIEgens could be used to induce bioactive components in microalgae through altering the ROS signaling, therefore are more auspicious for biomedical research. This study reviews the prospects of AIEgen‐based technologies to understand the ROS mediated bio‐physiological processes in microalgae for better healthcare benefits.

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Section: Current Methods and Their Relevance To Ros Studiesmentioning

confidence: 99%

Microalgae‐Derived Health Supplements to Therapeutic Shifts: Redox‐Based Study Opportunities with AIE‐Based Technologies

Reza

Zhu

Qin

et al. 2021

Adv Healthcare Materials

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“…Similar morphological features were also reported for poly(para-phenylene terephtalamide)-based laminate cellulose composites made by hot-pressing. [82] The mechanical properties of cellulose sheets depend on different factors such as the nature of the fibers, length, and the bonding strength between the fibers. [83] The industrial fabrication process forces the fibers to orient mainly in the machine direction, leading to specific mechanical properties in the longitudinal or transverse direction.…”

Section: Morphological and Mechanical Characterization Of The Cellulose-pcl Bio-compositesmentioning

confidence: 99%

Responsive Bio‐Composites from Magnesium Carbonate Filled Polycaprolactone and Curcumin‐Functionalized Cellulose Fibers

Quilez‐Molina

Pasquale

Debellis

et al. 2021

Advanced Sustainable Systems

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non-toxicity, low-density, biocompatibility properties, and low cost. [1][2][3][4][5] The main drawback associated with the use of cellulose in specific composites-related applications is its water sensitivity and ability to uptake significant amounts of moisture. [6][7][8] On the other hand, cellulose fibers have very good mechanical properties, and because of this, they have been employed to reinforce many petroleum polyolefins or bio-based resins. [9][10][11] Advances in the development of cellulose nanofibers and bacterial cellulose have led to many new generation cellulose composites with superior mechanical properties and functionality. [12][13][14][15][16] In addition, many different physicochemical methods have also been developed to extract cellulose from agricultural and food wastes including biomass that can potentially reduce deforestation related to cellulose production feedstock. [17][18][19][20] Many sustainable packaging solutions and technologies must guarantee product safety and increase shelf life while decreasing pollution related to nondegrading plastics. It is believed that biobased responsive polymers and composites can address this necessity if accompanying economic and environmental benefits are also demonstrated. This study is motivated by these recent advances. At the same time, recent awareness in reducing environmental plastic pollution has fueled a significant momentum towards using natural polymers Development of responsive bio-based and biodegradable materials is particularly important in food preservation and monitoring technologies. Although replacing conventional plastic products with sustainable alternatives is still a challenge, promising advances have been reported. In this work, the fabrication of responsive bio-composite films from polycaprolactone (PCL) and magnesium carbonate (MgCO 3 ), known as food additive E504 with melt impregnation into cellulose, is reported. Cellulose fibers are stained/coated with ethanoic curcumin solutions, primarily to protect them against oxidative degradation. The films demonstrate a strong antioxidant effect against fatty and aqueous food simulants with improved oxygen gas barrier properties. Interestingly, the natural chelation of curcumin with magnesium within the composites improves the bioavailability and antioxidant potency of curcumin. Moreover, the composites show reversible color change response detectable by the naked eye in basic solutions or vapors. This response is tested by placing the composite film inside a sealed plastic container containing shrimp at room temperature, but not in direct contact. Due to spoilage, a noticeable color change in the bio-composites is recorded. These simple, cost-effective, non-toxic, and paper-like flexible bio-composites can be fabricated on large scale and be used in diverse applications ranging from sustainable packaging to medical applications and freshness indicators.

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“…Despite all these previous efforts, Aramid fibers are still not attractive precursors of carbon materials due to their sophisticated applications in the aeronautical and aerospace industries. An alternative option of using Kevlar pulp has been employed previously as inexpensive feedstock, but surprisingly there are no studies on carbonization of Aramid fibrous textile waste [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Activated Carbon Derived from Carbonization of Kevlar Waste Materials: A Novel Single Stage Method

et al. 2021

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The augmented demands of textile materials over time have brought challenges in the disposal of substantial volumes of waste generated during the processing and end of life of such materials. Taking into consideration environmental safety due to discarding of textile waste, it becomes critical to recuperate useful products from such waste for economic reasons. The present work deals with the preparation of porous and electrically conductive activated carbon fabric by a novel single stage method of simultaneous carbonization and physical activation of Kevlar feedstock material procured from local industries, for effective electromagnetic (EM) shielding applications. The Kevlar fabric waste was directly carbonized under a layer of charcoal without any intermediate stabilization step at 800 °C, 1000 °C, and 1200 °C, with a heating rate of 300 °C/h and without any holding time. The physical and morphological properties of the activated carbon, influenced by carbonization process parameters, were characterized from EDX, X-ray diffraction, SEM analysis, and BET analysis. Furthermore, the electrical conductivity was analyzed. Finally, the potential application of the activated material for EM shielding effectiveness was analyzed at low (below 1.5 GHz) and high (2.45 GHz) frequencies. The phenomena of multiple internal reflections and absorption of electromagnetic radiations was found dominant in the case of activated carbon fabric produced at higher carbonization temperatures.

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Toward high-performance poly(para-phenylene terephthalamide) (PPTA)-based composite paper via hot-pressing: the key role of partial fibrillation and surface activation

Abstract: Hot-pressing is in favor of fibrillation and property enhancement for para-aramid fiber based composite.

Cited by 29 publications

References 50 publications

Microalgae‐Derived Health Supplements to Therapeutic Shifts: Redox‐Based Study Opportunities with AIE‐Based Technologies

Microalgae‐Derived Health Supplements to Therapeutic Shifts: Redox‐Based Study Opportunities with AIE‐Based Technologies

Responsive Bio‐Composites from Magnesium Carbonate Filled Polycaprolactone and Curcumin‐Functionalized Cellulose Fibers

Activated Carbon Derived from Carbonization of Kevlar Waste Materials: A Novel Single Stage Method

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