FFECT ORFUNCTONALIZED MULTWALLED CARIBON NANOTUBESONTHERMAL STABILITY OF POLY (L-LACTIDE) BIODEGRADABLEPOLYMER

سال انتشار: 1390
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 260

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شناسه ملی سند علمی:

UFGNSM03_022

تاریخ نمایه سازی: 10 تیر 1396

چکیده مقاله:

The Poly (L-lactide) PLLA biocompatible and biodegradable polymer was reinforced with functionalized Multiwalled carbon nanotubes (MWCNTs) to overcome on insufficient mechanical properties of PLLA for high load bearing applications. The pristine MWCNTs (pMWCNTs) were functionalized, at first, by Friedel Crafts acylation, which introduced the aromatic amine groups on the side wall of MWCNTs (MWCNT-NH,) without shortening or cutting of pMWCNTs. And then, the PLLA chains covalently grafted from the sidewall of MWCNT-NH2 by in situ ring-opening polymerization of L-lactide oligomers (LA) using stannous octanoate as the initiating system (MWCNT-g-PLLA). The FT-IR and XPS spectra revealed that the PLLA chains grafted form the sidewall of MWCNTs strongly. The thermo-gravimetric analysis of prepared composites with various concentrations of MWCNT-g-PLLAs shows a significant increment in thermal stability of composites with increasing the concentration of MWCNT-g-PLLAs in composites. The XRD analysis revealed that the MWCNT-g-PLLAs increased the crystallinity of PLLA, indicating that the composites with PLLA grafted MWCNTs were more thermally stable than that of neat PLLA.

نویسندگان

MARYAM AMIRAN

Dep. of Materials Physics and Chemistry, School of Materials Science and Engineering, Harbin Institute of Technology,

ALINABIPOUR CHAKOLI

Dep. of Materials Physics and Chemistry, School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box ۴۰۵, Harbin, ۱۵۰۰۰۱, P. R. China. Tel: +۸۶-۴۵۱۸۶۴ ۱۳۹۲۲ Materials Research School, NSTRI, P. O. Box: ۱۴۳۹۵-۸۳۶, Karai, Iran

WEICAL JIEHESUI

Dep. of Materials Physics and Chemistry, School of Materials Science and Engineering, Harbin Institute of Technology,