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Polyacetal/polytetrafluoroethylene blends—II. The effect of chemical surface treatment of polytetrafluoroethylene

✍ Scribed by Wen-Yen Chiang; Chi-Yuan Huang

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
787 KB
Volume
28
Category
Article
ISSN
0014-3057

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✦ Synopsis

The mechanical, physical, wear, dielectric, thermal and morphological properties of blends of polyacetal (POM) with surface-modified polytetrafluoroethylene (CPTFE) were examined and compared with those of POM/PTFE blends. The PTFE was added to POM to improve the wear properties; the tensile strength, Young's modulus and elongation of POM/PTFE blends decreased with increasing PTFE content but the tensile strength and the Young's modulus of POM/CPTFE blends were more than twice those of the POM/PTFE blends. The NaF salt which was adsorbed on the CPTFE acted as a coupling agent and provided very strong bonding between POM and CPTFE. The free NaF salt also seemed to form nuclei aiding POM crystallization; this effect was not found in POM/PTFE systems. For POM/PTFE, SEM showed that the size of PTFE particles was in the range 15~0/~m. In POM/CPTFE systems, the particle size of CPTFE was < 1/~ m. Increasing times of chemical surface treatment of CPTFE increased the tensile strength of POM/CPTFE blends.

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