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. Author manuscript; available in PMC: 2011 Jul 1.
Published in final edited form as: React Funct Polym. 2010 Jul 1;70(7):433–441. doi: 10.1016/j.reactfunctpolym.2010.04.003

Table 1.

Kinetic parameters for the methanolysis of sunflower seed oil catalyzed by organic bases at 70°C.

Catalysta Half-life (t1/2, min)b Second-order rate constant (k″, M−1min−1)c
TBD 3±1 2.3
PHMBG 11±3 1.4
XL-PHMBG M1 28±5 0.60
XL-PHMBG M2 18±0.4 0.94
PEI 41±6 0.093
XL-PEI 47±5 0.083
PVG 154±13 0.067
XL-PVG 214±14 0.050
a

The catalysts are abbreviated as follows: TBD: triazabicyclodecene; PHMBG: poly(hexamethylene biguanide); XL-PHMBG M1: cross-linked poly(hexamethylene biguanide) (Method 1); XL-PHMBG M2: cross-linked poly(hexamethylene biguanide) (Method 2); PEI: poly(ethylene imine); XL-PEI: cross-linked poly(ethylene imine); PVG: poly(N-vinylguanidine); XL-PVG-cross-linked poly(N-vinylguanidine).

b

Half-life was calculated from t1/2=ln(2)/kobs, where kobs is the experimentally observed reaction rate constant.

c

Apparent second-order rate constants were calculated as a mean of three measurements from k″=ro/CsCcat, where ro=kobsCs is the initial reaction rate, Cs and Ccat are initial effective concentrations of the substrate (oil) and catalyst, respectively. The Ccat values were calculated as effective molar concentrations of the catalytic groups.