Table 2.

Activation Energy (E _a) and Pre-Exponential Factor (log (τ _o)) obtained from the Arrhenius equation applied to the data in Fig. 4.

Sample	w/c	Process 1		Process 2		Process 3 (145 K < T < 165 K)
		log (τ0 [s])	E a [eV]	log (τ0 [s])	E a [eV]	log (τ0 [s])	E a [eV]
OPC-3w	0.3	−13.5	0.19	−13.9	0.26	−15.0	0.42
	0.4	−13.3	0.20	−13.9	0.26	−16.4	0.47
	0.5	−13.9	0.20	−13.8	0.26	—	—
OPC-4y	0.3	−14.5	0.23	−14.6	0.28	−13.3	0.39
	0.4	−13.6	0.21	−14.5	0.28	−12.9	0.37
	0.5	−12.5	0.18	−14.4	0.28	−14.1	0.41