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Surface‐grafting onto aramid powder: reaction of acyl chloride groups on the surface with functional polymers having terminal hydroxyl or amino groups
Author(s) -
Tsubokawa Norio,
Oyanagi Takashi
Publication year - 1994
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1994.220051209
Subject(s) - materials science , grafting , aramid , polymer chemistry , thermogravimetric analysis , wetting , polymer , chloride , acyl chloride , contact angle , surface modification , chemical engineering , organic chemistry , composite material , chemistry , engineering , metallurgy , fiber
The surface‐grafting of polymers onto aramid, poly(p‐phenylene terephthalamide), powder surface by the reaction of acyl chloride groups on the surface with functional polymers having terminal hydroxyl and amino groups was investigated. The introduction of acyl chloride groups onto the aramid powder surface was achieved by the reaction of the aramid powder with adipoyl dichloride: the acyl chloride group content of the surface was estimated to be 1.14 mmol/g ( 0.17 mmol/m 2 ) by elemental analysis. It was found that by the reaction of acyl chloride groups on the surface with functional polymers, such as terminal diol‐type poly(propylene oxide) (PPG) and terminal diamine‐type poly(dimethylsiloxane) (SDA), these polymers were grafted onto the aramid powder surface; the percentage of surface grafting of PPG and SDA onto the aramid powder was 16.7 and 22.4 %, respectively. The thermogravimetric curve of PPG surface‐grafted aramid powder exhibited an initial weight loss at about 250 °C and a second weight loss at about 500 °C. This indicated that the grafting of PPG is limited to the powder surface. The wettability of the aramid powder surface turned from hydrophobic to hydrophilic by the surface‐grafting of PPG onto the surface.