Premium
Syntheses and biodegradability of benzylated waste pulps and graft copolymers from PBzs and L‐lactic acid
Author(s) -
Hadano Shingo,
Maehara Seiji,
Onimura Kenjiro,
Yamasaki Hirohito,
Tsutsumi Hiromori,
Oishi Tutomu
Publication year - 2004
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.20280
Subject(s) - biodegradation , solubility , crystallinity , copolymer , pulp (tooth) , hydrolysis , lactic acid , materials science , polymer chemistry , chemistry , nuclear chemistry , organic chemistry , polymer , composite material , bacteria , medicine , pathology , biology , genetics
Benzylated waste pulps (PBzs) were synthesized from treated waste pulp (Pulp), and benzyl chloride with phase transfer catalyst (PTC), and graft copolymers (PBz‐ g ‐LA) were synthesized from PBzs and L‐lactic acid (LA). Thermal properties, solubility, crystallinity, and biodegradability of the obtained PBzs and graft copolymers were investigated. PBzs with the degree of substitution (DS) higher than 1.5 showed T g and T m in DSC measurement. All PBz‐ g ‐LA exhibited no T m . However, the graft copolymers obtained from lower DS PBzs having no T g , exhibited T g . The solubility of PBzs enhanced with increasing DS, and the crystallinity of PBzs reduced with increasing DS because of hydrophobicity and steric effect of benzyl groups. The solubility of graft copolymers was similar to that of original PBzs. Biodegradation tests for PBzs, Pulp, and graft copolymers were performed using cellulase in 0.1 M acetate buffer solution (pH 5.5) at 37°C. All samples showed biodegradability though the biodegradation rate decreased with increasing DS of PBz. In PBz‐ g ‐LA, the initial biodegradation rate was faster than that of original PBz because of hydrolysis of LA units. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2658–2664, 2004