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- Gel_point abstract "If one of the monomers in a copolymerization has a functionality greater than 2, a branched copolymer can be formed. It is also possible for the branches to react and create cross-links. In this way, “infinite” polymer networks called gels are made.Definitions:PA = probability that A reactsPB = probability that B reactsNAo = original number of A groups (@ t = 0)NBo = original number of B groups (@ t = 0)r=NAo/NBoAssuming A can only react with B:NAoPA = NBoPB and rPA = PBFor gelation to occur, q, the fraction of all monomer units in the sample that form cross-links, must be greater than qc, the critical value of q:qc =1/(f-1)and q=(PAPBp)/(1-PAPB(1-p))where f is the number of functional groups on the molecule with highest functionality. Additionally, only the highest functionality molecule reacts and causes branching, so another factor, p, must be considered.p = (functionality of branched molecule * number of moles)/(sum(functionality * number of moles of all molecules of that type))For example, if 0.5 moles of trifuctional A, 1 mole of difunctional A, and 2 moles of difunctional B molecules were reacted:p = (3*0.5 moles)/(2*1 mole+3*0.5 moles) = 1.5/3.5 = 0.43The limiting reactant in this situation is A because NAo = 3.5 mol < NBo = 4 mol. Solving for PA gives the fractional conversion of limiting reagent required to react for gelation to occur.".
- Gel_point wikiPageID "14668195".
- Gel_point wikiPageRevisionID "604741175".
- Gel_point hasPhotoCollection Gel_point.
- Gel_point subject Category:Chemical_properties.
- Gel_point subject Category:Polymer_physics.
- Gel_point type Abstraction100002137.
- Gel_point type Attribute100024264.
- Gel_point type ChemicalProperties.
- Gel_point type ChemicalProperty105009758.
- Gel_point type Property104916342.
- Gel_point comment "If one of the monomers in a copolymerization has a functionality greater than 2, a branched copolymer can be formed. It is also possible for the branches to react and create cross-links.".
- Gel_point label "Gel point".
- Gel_point label "Gelpunkt".
- Gel_point sameAs Gelpunkt.
- Gel_point sameAs m.03gsg08.
- Gel_point sameAs Q573439.
- Gel_point sameAs Q573439.
- Gel_point sameAs Gel_point.
- Gel_point wasDerivedFrom Gel_point?oldid=604741175.
- Gel_point isPrimaryTopicOf Gel_point.