Abstract
Ultra-high strength polyethylene fibres were chlorosulfonated according to Kanig's technique. It has been found that the tensile strength of the fibre decreases during chlorosulfonation, whereas the Young's modulus can be increased by more than fifty percent of its original value. The interfacial bond-strength between polyethylene and gypsum plaster could be improved at least 4.8 times, amounting values of 6.3 MPa, making these fibres very suitable for use as a reinforcing material in gypsum plaster. SEM indicated that this improvement could be described to surface roughening of the fibre, due to chemical degradative stress-cracking during constrained chlorosulfonation.
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