30. Furan-Based Adhesives

a few furanic monomers and resins are involved, namely: 1, 2, 3, 5, and 6, as well as liquid
oligomers of 2 (poly2) and3 (poly3). The properties of these monomers together with
the mechanisms of their resinification and the composition of poly2 and poly3 will
be briefly dealt with before discussing their use in the manufacture of resins for binders
and adhesives.
II. PROPERTIES OF FURANIC MONOMERS
The relevant properties of furanic compounds covered in this review are summarized in
Table 1.
The compositions of poly2 and poly3 were studied by several groups [2,3] and shown
to have mainly the following structures:
Their relative abundance depends, of course, on the conditions used for their
syntheses. A typical composition [3] is given in Table 2.
Table 1 Properties of Furanic Compounds Used in Adhesives
Compound type 1 2 3 5 6
Molecular weight 96.09 98.10 128.10 136.15 214.22
Boiling point ( C) 161 170 — 116 a
—
Melting point ( C) 39.7
Density at 20 C (kg/dm 3 ) 1.16 1.13 — 1.06 b
—
Refractive index at 20 C 1.53 1.49 — —
Viscosity at 25 C (mPa s) 1.48 4.62 — — —
Surface tension (mN/m) 40 c
38 d
— — —
a At 10 mm Hg.
b at 45 C.
c at 30 C.
d at 25 C.
Table 2 Typical Composition (w/w %) of poly2 and poly3
7 8 9 10
poly2 25 12 35 28
poly3 — — 5 95
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