Tensile Property Testing: The testing method was performed according to GB/T 1447-2005, "Test method for tensile properties of fiber-reinforced plastics", using a universal testing machine at a tensile rate of 2 mm/min and a gauge length of 50 mm. Each group was tested with 5 specimens, and the average value was taken. The purpose of the test was to evaluate the ability of BF/EP composites to resist tensile failure and to analyze the influence of different preparation processes on tensile strength and elongation at break. Impact Property Testing: The testing method was performed according to GB/T 1451-2005, "Test method for Izod impact strength of fiber-reinforced plastics", using an Izod impact testing machine with an impact energy of 5J and unnotched specimens. Each group was tested with 5 specimens, and the average value was taken. The purpose of the test was to evaluate the impact toughness of BF/EP composites and to explore the influence of fiber modification and content on the impact properties of the material. Flexural Property Testing: The testing method was performed according to GB/T 1449-2005, "Test method for flexural properties of fiber-reinforced plastics", using a flexural testing machine at a bending rate of 2 mm/min and a span of 80 mm. Each group was tested with 5 specimens, and the average value was taken as the final result. The purpose of the test was to evaluate the flexural strength and flexural modulus of BF/EP composites and to analyze the deformation and failure behavior of the material under bending loads. Aging Resistance Testing: The thermal aging test method was performed according to GB/T 7141-2008, "Plastics - Methods of exposure to hot air", placing the specimens in a 100°C oven and aging them for the set times, then removing them to cool to room temperature before testing the tensile strength. The hygrothermal aging test method was performed according to GB/T 1034-2008, "Determination of water absorption of plastics" and GB/T 1446-2005, "General rules for testing methods of fiber-reinforced plastics", placing the specimens in a hygrothermal aging chamber (85°C, 85% relative humidity) and aging them for different times before testing the tensile strength. The UV-hygrothermal composite aging test was performed with reference to GB/T 16422.2-2022, "Plastics - Laboratory exposure to light sources - Part 2: Xenon-arc lamps". The purpose of the test was to investigate the performance degradation law of BF/EP composites in hot and humid environments and to evaluate their aging resistance stability. Microstructure Analysis: Scanning electron microscopy (SEM) analysis was performed by sputter-coating the basalt fibers before and after modification, the tensile fracture surface of the composite material, and the fracture surface samples of the aged composite material with gold. The surface morphology and fracture structure were observed using SEM to analyze the fiber surface roughness, the interfacial bonding state between the fiber and the matrix, the interfacial debonding after aging, and the fiber fracture morphology. Fourier transform infrared spectroscopy (FT-IR) analysis was performed by using the KBr pellet method on the basalt fibers before and after modification and the epoxy resin matrix before and after aging, in the wavenumber range of 4000-400 cm⁻¹, to analyze the changes in surface functional groups of the fibers before and after modification and the changes in the chemical structure of the epoxy resin matrix before and after aging. Thermogravimetric analysis (TGA) was performed on the BF/EP composite materials before and after aging in a nitrogen atmosphere.
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Table of Contents (TOC) based on the abstract:
Pressure engineering is a potent method for tailoring material properties, but the resulting changes are usually reversible. This study presents a unique exception in the 1D hybrid metal halide (C4H8N)2PbCl4, where self-trapped exciton (STE) emission displays unusual asymmetry and irreversibility during compression and decompression. This uncommon behavior arises from a pressure-activated chemical process within the crystal lattice. Although this process is inherently reversible, it initiates a permanent structural mutation in the inorganic [PbCl4]2− chains, leading to a persistent reshaping of the excitonic energy landscape.
By uncovering an unconventional mechanism that links exciton dynamics with lattice reconstruction and organic chemical reactivity, this research demonstrates that pressure engineering can go beyond simple lattice compression. It also offers a practical strategy for achieving irreversible optoelectronic modulation in hybrid materials.](/_next/image?url=https%3A%2F%2Fpub-8c0ddfa5c0454d40822bc9944fe6f303.r2.dev%2Fai-drawings%2FTVAa3VmfflgMgMB7hwJLJaCFGK8awU99%2F47769a4d-56f9-4d5d-a1de-b2eeddd2b0cc%2Fcfe88c6f-22bf-4a93-9ed0-e57f2f40cdee.png&w=3840&q=75)