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POM SEM study of natural aging


There are many reports and comments. In this paper, SEM to examine the small outdoor exposure 3N36 POM months and fracture surface morphology, reveals the aging of the material part of an experiment. Sample: pure POM, Shanghai solvent factory production. Standard test bar: 55x6 × 4mm. 2. Aging Location: Wanning County, Guangdong Province, latitude I8. 58, longitude 40.05, elevation I2m. 5. SEM sample preparation: the sample surface morphology directly after the aging test strips cut the appropriate size of the sample stuck to the sample stage, sprayed gold stand. Fracture morphology of the samples, the standards need to be tested after aging in JB8 Article type impact fracture on impact test machine, and then carefully cut section, so as not to bruise the surface of powder, spray adhesive on the sample stage with gold for observation. 4. Hao try to cum: Cambridge, UK S2000 scanning electron microscope company. 30 to 30 times magnification: resolution of 4.5nm. Results and discussion 1. Bad surface morphology changes with aging time is due to the characteristics of POM aging heat, oxygen, light and head the combined effect of structural changes from f, the main performance is its shape; Fun crack, deformation, powder. Can be seen from Figure 1: POM in the surface cracks in the aging process, generate crack, with the longer aging time, the crack widens gradually increased, while generating many small cracks. : Is apparent from Figure 2; aging Tian continues to lengthen the time the sample has become more and more rough surface, to the aging of the late,[link widoczny dla zalogowanych], can see the cries of the sample surface appears fine powder of the phenomenon. 2. Aging waste thickness, width, and snapped the rod snapped sensitive time change the depth of sweet wine that week 3: early and late in the aging, aging, rapid changes in thickness,[link widoczny dla zalogowanych], a change in the mid-level platform Ai (b) l8 October capsule Figure 1P0M surface turtle love video mandarin duck (b) l2 October c) 36 October Bei Wai 2P0M capsule surface area of the shadow mandarin duck,[link widoczny dla zalogowanych], indicating that P () M of the aging rate than reflected in the early and late. Crack depth in the 18 months before the change is evident with the faint crack width of the longer i slowly widened between the mechanical properties from the point of view, when the exposure 3 to 7 months, the impact strength on the rate of decline began too. It shows again. In the early aging, P () M structure to the beginning of a significant change, and to the mechanical properties of materials has been severely affected 5. P0M stupid Nang form can be observed from Figure 4: the aging of the extended thickness of cyberspace at any time outside to the inside to develop in depth. 5 months ago, is still present inside the material section of a typical Lian Ren, to 12 months, not only to increase the thickness of aging, and gradually moved from the internal structure of materials, fracture toughness, into brittle fracture, to 3O months, the materials have shown brittle fracture, this time, materials exhibit poor physical properties. Summing up with, SEM can clearly reveal the POM into the brittle-ductile transition within the performance by the change process of polymer materials is a valid means of the aging process. Aging time (2) Figure s the thickness of the aging repeated, crack drum width,[link widoczny dla zalogowanych], love deeply virtual convergence changes with the aging of the question degree of thickness △ foot cliff crack crack width in the finishing process thanks to the article are the aging of this group assistance in this field thanks j arrow lip suddenly 4P0M
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