Table 1 General material properties and thickness of the polyimide aerogel blocks.

From: Polyimide aerogels for ballistic impact protection

Name

Bulk density,

ρb (g cm−3)

Porosity,

Π (% v/v)a

Linear shrinkage (%)b

Thickness (cm)

PI-1

0.19

86.99

22

1.15

PI-2

0.16

89.05

18

1.17

PI-3

0.15

89.73

15

1.50

PI-4

0.16

89.05

17

1.25

PI-5

0.16

89.05

17

1.20

PI-6

0.16

89.05

18

1.20

PI-7

0.16

89.05

17

1.10

PI-8

0.19

86.99

22

1.20

PI-9

0.15

89.73

16

1.20

PI-10

0.16

89.05

17

1.18

PI-11

0.2

86.31

23

1.11

PI-12

0.21

85.62

24

1.09

Average

0.17 ± 0.02

88.30 ± 1.41

18.83 ± 3.04

1.20 ± 0.11

  1. Significant values are in [bold].
  2. aPorosity = 100 × [(ρs−ρb)/ρs], where ρs is 1.46 ± 0.08 g cm−3, the skeletal density measured by Helium pycnometry.
  3. bShrinkage = 100 × (mold diagonal− sample diagonal)/(mold diagonal).
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