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1、Scanning Electronic Microscope Scanning electronic microscope (SEM) is an instrument used to magnify the fine details of material surfaces such as polymer splitting, polymer pull-out, debonding, matrix cracking and polymer matrix adhesion and determine its chemical composition. It is also used to ch
2、eck the morphology, and crystallization structure.Scanning electronic microscopy consists of: Electron gun Condenser lens Scan coil Objective lens Specimen and detectorPrinciple of SEM A beam of electrons is produced at the top of the microscope by an electron gun. The electron beam held within a va
3、cuum and directed to the sample through electromagnetic fields and lenses. Once the beam hits the sample, electrons and X-rays are ejected from the sample. Detectors collect X-rays, backscattered electrons, and secondary electrons and convert them into a signal. This will produce the final image.Sam
4、ple preparation 1. Degrease sample using acetone- to ensure removal of hydrocarbon and volatile compound.2. Sample need to be dehydrated to make sure no water present in the sample.-Drying in the oven at 60 C for 24 hours.3. Non conductive sample need to be converted by coating the sample thin layer of conductive material(e.g.gold) particle using sputter coaterFor PLA, system operated at 20 to 30 KV and the photo was recorded at 1000- 3000 x magnification
