Synthesis of over oriented polyester-Iota

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News > Dynamic industry > Synthesis of over oriented polyester

Synthesis of over oriented polyester

2.1 synthesis of over polyester
The synthesis of the hyper - based polyester can be divided into one - step and quasi - step method by the polymerization process.. One step is to synthesize the required monomer and catalyst to synthesize the required monomer in one step.. This method is simple, but the molecular weight distribution of the polyester is relatively wide, so people often can reduce its molecular weight distribution by adding the nuclear monomer, that is, the nuclear one step method ". Quasi one step refers to the part of the reactive monomer and catalyst to join the tank reactor. After reacting for a certain period of time, add the remaining monomer and catalyst. This method to obtain the molecular weight of the polyester distribution is narrow.
ABx 2.1.1 monomer self condensation polymerization
Containing a reactive groups A and X A and the other reactive groups B ABX (X>2) type monomer, through intermolecular condensation reactions, can be formed at the end of the chains remaining large amounts of unreacted functional groups B highly branched three-dimensional structure without crosslinking reaction.
ABx monomer self polymerization of the synthesized polyester has major defects, that is, the molecular weight distribution is wider. M ller and many et al. Study shows that if the self shrinking polymerization and introduced into a BF structure of nuclear molecular, can effectively control the polyester molecular weight distribution.
2.1.2 multifunctional monomer copolymerization
The copolymerization reaction was carried out directly by An+Bm two monomers (A2+B3 monomer copolymerization in most cases).. An+Bm two monomer copolymer synthesis using hyperbranched polyesters, which in a certain extent, solves the in the AB2 monomer structure directly from poly synthesis of hyperbranched polyester monomer source difficult problem.
2.1.3 ring polymerization
Latent ABX monomers ring opening polymerization, ABX monomers itself does not include a support unit, a support unit is in the open process of cyclization reaction and reaction process as shown in Figure 4, open-loop polymerization and ordinary stepwise polymerization compared, in the polymerization process does not produce low molecular weight compounds, so it is easy to make the product of high molecular weight.

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