Abstract
Thermosetting polymers are frequently used in formulations, including rubbers, thermoplastic polymers or oils, etc, in an amount of the order of 2–50 wt% with respect to the thermoset. This extra component, called the modifier, may initially be immiscible or may phase-separate during cure. This last process, i.e the reaction-induced phase separation, is the subject of this review. A thermodynamic description of the process is made, using the Flory-Huggins equation at two approximation levels, i.e. a quasi-binary approach and a multicomponent treatment taking polydispersity of constituents into account. Thermodynamic factors affecting the phase separation process are thus established. Nucleation and growth (NG) and spinodal demixing (SD) are considered as possible phase separation mechanisms. Factors promoting one or the other process are discussed. The control of morphologies generated is analyzed on the basis of thermodynamic and kinetic arguments. Ideas for obtaining particular morphologies enhancing particular properties are put forward.
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Abbreviations
- a:
-
parameter included in the relationship between the Flory-Huggins interaction parameter and the absolute temperature
- A4 :
-
tetrafunctional monomer
- b:
-
slope of the relationship between the Flory-Huggins interaction parameter and the inverse of absolute temperature
- b1, b2 :
-
constants included in the dependence of x with temperature and composition
- B2 :
-
difunctional monomer
- Cpart :
-
concentration of dispersed phase particles
- \(\bar D\) :
-
average diameter of dispersed phase particles
- d0, d1, d2 :
-
constants included in the dependence of x with temperature and composition
- E:
-
elastic (Young's) modulus
- Em,n :
-
oligomer produced by polycondensation, containing n molecular units of monomer and m molecular units of comonomer (hardener)
- g:
-
interaction parameter depending on both temperature and composition
- G:
-
Gibbs free energy
- g0, g1, g10, g11 :
-
constants included in the dependence of g with temperature and composition
- GIc :
-
fracture energy
- h:
-
parameter in the Schultz-Zimm equation
- H:
-
enthalpy
- II :
-
integrated intensity of the scattered light
- I(q) :
-
intensity of the scattered light as a function of the scattering vector
- K:
-
ratio of the phase separation rate with respect to the cure reaction rate
- kB :
-
Boltzmann constant
- KIc :
-
critical stress intensity factor
- M:
-
modifier
- \(\bar M\) i :
-
molar mass of component i
- \(\bar M\) n :
-
number-average molar mass
- N:
-
number of moles
- p:
-
conversion
- P:
-
average species of the polymer
- Pi :
-
macromolecule containing i monomer units
- Pi,j,k :
-
macromolecule obtained by chain polymerization, containing i monomer units, j functional groups and k active centres
- q:
-
scattering vector
- r:
-
ratio of amine to epoxy equivalents
- R:
-
gas constant
- S:
-
entropy
- t:
-
time
- T:
-
absolute temperature
- Tg :
-
glass transition temperature
- gelTg:
-
temperature where gelation and vitrification take plase simultaneously
- Tg∞ :
-
ultimate glass transition temperature of the polymer network
- Tr :
-
reaction temperature
- U:
-
parameter in the Schulz-Zimm equation
- V:
-
molar volume
- v0 :
-
initial reaction rate
- VD :
-
volume fraction of dispersed phase
- VMS :
-
molar volume of the unit segment of a polymeric modifier
- VPS :
-
molar volume of the unit segment of the thermosetting polymer
- Vr :
-
molar volume of the unit cell (reference volume)
- VT :
-
total volume of the system (extensive property)
- x:
-
denotes the x-mer of a polymeric modifier
- \(\overline {X_n }\) :
-
number-average degree of polymerization
- \(\overline {X_w }\) :
-
mass-average degree of polymerization
- y:
-
denotes the y-mer of the thermosetting polymer
- Zc :
-
coordination number of a unit cell
- Zi :
-
ratio of the molar volume of component i with respect to the molar volume of the unit cell
- α-phase:
-
thermoset-rich phase
- αi :
-
thermal expansion coefficient of component i
- β-phase:
-
modifier-rich phase produced in the course of the primary phase separation
- x:
-
Flory-Huggins interaction parameter
- δ:
-
solubility parameter
- δ-phase:
-
modifier-rich phase inside particles of the β-phase (secondary phase separation)
- ΔG:
-
Gibbs free energy of mixing per unit volume of system
- ΔGc :
-
free energy barrier for nucleation
- ΔGM :
-
Gibbs free energy of mixing (extensive property)
- ΔH:
-
enthalpy of mixing per unit volume of system
- ΔHM :
-
enthalpy of mixing (extensive property)
- ΔS:
-
entropy of mixing per unit volume of system
- ΔSM :
-
entropy of mixing (extensive property)
- Δμi :
-
chemical potential of component i
- ε′:
-
exchange energy
- εij :
-
energy of a contact between components i and j
- φ:
-
volume fraction
- γ:
-
constant included in the dependence of γ with temperature and composition
- γ-phase:
-
thermoset-rich phase inside particles of the β-phase (secondary phase separation)
- Γ:
-
gamma function
- η:
-
viscosity
- Λ:
-
interaction parameter with units of energy per unit volume
- σ0 :
-
interfacial tension
- σy :
-
yield stress
- ω:
-
mass fraction
- CP:
-
value of the cloud point
- crit:
-
value at the critical point
- gel:
-
value at the gel point
- M:
-
modifier
- 0:
-
initial value
- P:
-
polymer
- S:
-
silicon chip
- x:
-
x-mer of a polymeric modifier
- y:
-
y-mer of the thermosetting polymer
- AN:
-
acrylonitrile
- ATBN:
-
amino-terminated butadiene-acrylonitrile copolymer
- BD:
-
butadiene
- BMC:
-
bulk moulding compound
- CE:
-
cyanate ester
- CO:
-
castor oil
- CP:
-
cloud point
- CPC:
-
cloud-point curve
- CS:
-
core-shell particles
- CTBN:
-
carboxyl-terminated butadiene-acrylonitrile copolymer
- 3DCM:
-
4,4′-diamino-3,3′-dimethyldicyclohexyl-methane
- DGEBA:
-
diglycidyl ether of bisphenol A
- EDA:
-
ethylenediamine
- ETBN:
-
epoxy-terminated butadiene-acrylonitrile copolymer
- FH:
-
Flory-Huggins
- GMA:
-
glycidyl methacrylate
- HIPS:
-
high-impact polystyrene
- IPN:
-
interpenetrated polymer network
- LCST:
-
lower-critical-solution temperature
- LS:
-
light scattering
- LT:
-
light transmission
- NFBN:
-
non-functionalized copolymer of butadiene and acrylonitrile
- NG:
-
nucleation-growth
- NR:
-
nucleation rate
- PDLC:
-
polymer-dispersed liquid crystal
- PE:
-
polyester
- PEI:
-
poly(etherimide)
- PES:
-
poly(ethersulfone)
- PICS:
-
pulse-induced-critical scattering
- PVAc:
-
poly(vinylacetate)
- PVME:
-
poly(vinylmethylether)
- R:
-
rubber
- S:
-
spinodal curve
- SAXS:
-
small-angle-X-ray scattering
- SBR:
-
styrene butadiene random copolymer
- SD:
-
spinodal demixing
- SEM:
-
scanning electron microscopy
- SMC:
-
sheet moulding compound
- SZ:
-
Schulz-Zimm equation
- TEM:
-
transmission electron microscopy
- TP:
-
thermoplastic
- TTT:
-
time-temperature-transformation diagram
- UCST:
-
upper-critical-solution temperature
- UP:
-
unsaturated polyester
- UV:
-
ultraviolet light
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Williams, R.J.J., Rozenberg, B.A., Pascault, JP. (1997). Reaction-induced phase separation in modified thermosetting polymers. In: Polymer Analysis Polymer Physics. Advances in Polymer Science, vol 128. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-61218-1_7
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