TY  - EJOU
AU  - TURAN, CANSU ULKER 
AU  - GUVENILIR, YUKSEL 

TI  - Synthesis of poly(ω-pentadecalactone) using Lipase Immobilized onto a Renewable Carrier, Rice husk ash and their Characterization
T2  - Journal of Polymer Materials

PY  - 2021
VL  - 38
IS  - 3-4
SN  - 0976-3449

AB  - Rice husk ash is a side-product of rice production; thus, it is a cheap, abundant, and renewable
material, and utilized as an enzyme carrier to immobilize Candida antarctica lipase B. In this
study, Candida antarctica lipase B immobilized onto rice husk ashes was used to catalyze ring
opening polymerization of 16-membered lactone, ω-pentadecalactone. In order to determine
the best polymerization conditions for highest molar mass polymer, reactions were proceeded
at various temperatures and time periods. The best reaction conditions were obtained as 80°C
and 6 hours (M<sub>n</sub>
= 34255 g mol<sup>-1</sup>). Molecular structure of this polymer sample was confirmed via
proton nuclear magnetic resonance spectroscopy (<sup>1</sup>
H-NMR) and Fourier transform infrared
spectroscopy (FTIR). Thermal properties were investigated by differential scanning calorimetry
(DSC) and thermal gravimetric analysis (TGA). Consequently, poly(ω-pentadecalactone) was
synthesized enzymatically with rapid polymerization tendency and improved thermal properties
which were quite close to low-density polyethylene. Successful polymerization results showed
that Candida antarctica lipase B immobilized onto rice husk ashes may be a good alternative to
commercial immobilized form, Novozyme 435, as a result of its comparable activity and low
cost.
KW  - Candida antarctica lipase B
KW  -  Enzymatic ring opening polymerization
KW  -  Poly(ω- pentadecalactone)
KW  -  Rice husk ash
KW  -  Immobilization

DO  - 10.32381/JPM.2021.38.3-4.8