Structural Foams of Biobased Isosorbide-Containing Copolycarbonate

Table 2

Specific mechanical tensile and bending properties of nonfoamed and foamed Bio-PC (the weight of the nonfoamed Bio-PC multipurpose test specimen is 13.53 g).

Property		Bio-PC	Bio-PC foams
CBA concentration	(wt.%)	0	2	2	3	3
Weight reduction	(%)	0	4.9	11.2	5.1	10.6
Density	(kg m^−3)	1363 ± 1	1296 ± 3	1211 ± 18	1293 ± 6	1219 ± 10
Specific tensile modulus	(MPa/(kg m^−3))	1.98 ± 0.05	1.95 ± 0.07	1.92 ± 0.10	1.97 ± 0.10	1.91 ± 0.05
Specific tensile strength	(kPa/(kg m^−3))	52.0 ± 0.4	50.0 ± 0.4	49.1 ± 1.3	49.4 ± 0.3	49.3 ± 0.8
Specific bending modulus	(MPa/(kg m^−3))	1.96 ± 0.01	2.03 ± 0.01	2.13 ± 0.03	2.03 ± 0.01	2.12 ± 0.01
Specific bending strength at	(kPa/(kg m^−3))	77.0 ± 0.0	79.5 ± 0.0	83.1 ± 0.9	78.3 ± 0.4	82.1 ± 0.5
Specific bending strength at 3.5%	(kPa/(kg m^−3))	60.1 ± 0.3	62.4 ± 0.2	66.0 ± 0.4	62.2 ± 0.2	64.9 ± 0.3