Fabrication technologies - Micromixers Fundamentals Design and Fabrication - page 141

Table 4.8 Typical Characteristics of Different Polymers for Micromolding (after [81,82] )

Polymers PMMA PC PS COC PP

Heat resistance ( C) 105 140 100 130 110

Density (kg/m 3 )

1,190 1,200 1,050 1,020 900

Refractive index 1.42 1.58 1.59 1.53 opaque

Resistant to:

Aqueous solutions yes limited yes yes yes

Concentrated acids no no yes yes yes

Polar hydrocarbons no limited limited yes yes

Hydrocarbons yes yes no no no

Suitable for micromolding moderate good good good moderate

Permeability coefficients (10 e 17 m 2 /s e Pa):

He 5.2 7.5 — — —

O 2 0.12 1.1 — — —

H 2 O 480 e 1,900 720 e 1,050 — — —

Hot-embossing parameters:

Embossing temperature ( C) 120 e 130 160 e 175 — — —

Deembossing temperature ( C) 95 135 — — —

Embossing pressure (bars) 25 37 25 37 — — —

e e

Hold time (s) 30 60 30 60 — — —

e e

FIGURE 4.12
Micro-injection molding system.