To improve the strength and maintain the inherent properties of flame-retardant polyacrylonitrile (FR-PAN) fiber, a commercialized hydrocarbon polymer, i.e., poly (vinyl alcohol) (PVA), used as an enhancement component, was blended with polyacrylonitrile (PAN) spinning dope to fabricate a PVA/PAN composite fiber through wet-spun technology. Then, cross-linked PVA/PAN composite fiber (C-PVA/PAN) was acquired via boric acid cross-linking. Finally, flame-retardant C-PVA/PAN fiber (FR-PVA/PAN) was prepared by phosphorylation. The structures of the samples were characterized by Fourier transform infrared analysis (FTIR) and X-ray photoelectron spectroscopy (XPS). The thermogravimetric analysis (TGA) results reveal that the thermal stability of the composite fiber is lower than that of the pristine PAN fiber. However, the char residue of the composite fiber is higher than that of the control sample, wherein, FR-PVA/PAN has the highest char residue of 62.5 wt% at 800 °C. The results regarding the combustion properties of FR-PVA/PAN show that the fire hazard of FR-PVA/PAN is restrained greatly, indicating excellent flame-retardant performance. The corresponding flame-retardant mechanism of FR-PAV/PAN is investigated by Pyrolysis gas chromatography and mass spectrometry (Py-GC/MS) and thermogravimetric analysis coupled with Fourier transform infrared analysis (TG-FTIR). The results indicate the gas-phase and condensed-phase flame-retardant mechanisms.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6316903 | PMC |
| http://dx.doi.org/10.3390/ma11122391 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Biomarkers.
Alzheimers Dement
December 2024
Laboratory of FMRI Technology (LOFT), Mark & Mary Stevens Neuroimaging and Informatics Institute, University of Southern California, Los Angeles, CA, USA.
Background: To validate the index of diffusivity along the perivascular space (ALPS index) as a biomarker for vascular cognitive impairment and dementia (VCID).
Method: The participants and MRI data used in this study were acquired as part of the MarkVCID consortium, which consisted of seven sites. A total of 578 participants (72.
Competitive Coordination and Dual Interphase Regulation of MOF-Modified Solid-State Polymer Electrolytes for High-Performance Sodium Metal Batteries.
Angew Chem Int Ed Engl
January 2025
Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Weijin Road 94, 300071, Tianjin, CHINA.
Solid-state polymer electrolytes (SPEs) have emerged as prominent candidates for solid-state sodium metal batteries (SMBs) due to their enhanced flexibility and reduced interfacial resistance. However, their performance is limited by poor Na+ conductivity at room temperature, disordered ion transport properties and unstable interfaces. Herein, a three-dimensional (3D) interconnected copper metal organic framework (Cu-MOF) on polyacrylonitrile (PAN) fibers is introduced into polyethylene oxide (PEO)-based SPEs to construct a composite electrolyte (PPNM).
View Article and Find Full Text PDFBreaking the Trade-Off Between Electrical Conductivity and Mechanical Strength in Bulk Graphite Using Metal-Organic Framework-Derived Precursors.
Adv Sci (Weinh)
January 2025
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials & College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
High-performance bulk graphite (HPBG) that simultaneously integrates superior electrical conductivity and excellent strength is in high demand, yet it remains critical and challenging. Herein a novel approach is introduced utilizing MOF-derived nanoporous metal/carbon composites as precursors to circumvent this traditional trade-off. The resulting bulk graphite, composed of densely packed multilayered graphene sheets functionalized with diverse cobalt forms (nanoparticles, single atoms, and clusters), exhibits unprecedented electrical conductivity in all directions (in-plane: 7311 S cm⁻¹, out-of-plane: 5541 S cm⁻¹) and excellent mechanical strength (flexural: 101.
View Article and Find Full Text PDFDeveloping Topics.
Alzheimers Dement
December 2024
University of Puerto Rico, Medical Sciences Campus, School of Medicine, San Juan, PR, USA.
Background: Alzheimer's disease (AD) is the most common cause of dementia, consisting of a highly debilitating disorder. It disproportionately affects Caribbean Hispanics, including Puerto Ricans living on the island, where it ranks as the fourth leading cause of death. Reported disparities in AD severity and mortality within this population may stem from various factors, including nutrition, lifestyle, socioeconomic risk status, and more prevalent chronic diseases.
View Article and Find Full Text PDF"Snakeskin" Bioinspired Design for Polymer Composite with Enhanced Positive Temperature-Dependent Thermal Conductivity.
Nano Lett
January 2025
Department of Forest Biomaterials, North Carolina State University, Raleigh, North Carolina 27607, United States.
Albeit there is widespread application of thermally conductive polymer composites, one challenge is their typical negative temperature dependence on thermal conductivity (TDTC) due to the mismatch in thermal expansion between the polymer and fillers, creating voids at the interfaces. Inspired by the hierarchical structure of snakeskin, where rigid scales and a soft intergap manage expansion, we designed a segregated structure by coating a high-expansion high impact polystyrene (HIPS)/graphite (Gt) composite with a copper alloy. We hypothesize that the Cu alloy restricts the thermal expansion of HIPS/Gt while forming a pseudoconductive network, enhancing TDTC and thermal conductivity (TC).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!