Foaming Behaviour, Structure, and Properties of Polypropylene Nanocomposites Foams

Table 2

DMA results of the solid and foamed unfilled, MMT, and CNF-reinforced PP foams.

Material	Direction	𝑇g^∗ (∘C)	𝐸^ at 20∘C (MPa)	Specific modulus (MPa·cm^3·g^-1)	S
PP	Solid	5.4	1961.3	2114.4	—
	P	6.6	206.5	676.3	1.1
	N	4.7	179.9	589.2
PP-MMT	Solid	6.0	2010.0	2152.0	—
	P	5.6	261.5	839.9	1.0
	N	5.9	252.7	823.1
PP-5% CNF	Solid	5.2	1827.5	2006.0	—
	P	4.5	235.4	801.5	1.1
	N	2.5	209.6	713.6
PP-10% CNF	Solid	7.3	2300.3	2532.6	—
	P	6.9	231.4	806.6	0.7
	N	5.2	328.6	1100.9
PP-20% CNF	Solid	7.5	2732.7	2832.1	—
	P	4.5	543.5	1230.0	1.0
	N	4.3	473.6	1185.5

^∗𝑇_g—Glass transition temperature measured in tan𝛿.