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In recently years,some materials which is better in thermal
and mechanicalproperties are desired in some application.
Polyethylene naphthalate(PEN) andPolybutylene naphthalate(PBN)
have attracted wordwide attention because oftheir superior
thermal,mechanical,barrier and chemical resistance properties.
Numerous research works are currently underway to develop
commercial application for these new high performance polyester.
In noncrystalline property of PEN.In the other hand,we are also
hoping to improve solubility and processability of PEN,PET and
to reduce the cost of PEN. In the research,we synthesis the
BHEN by directly esterizing in the firststep.In order to enhence
the reaction rate of esterizing,we adopt the way ofmother-liquid
method.The method can improve the dissolving proportion of
2,6-NDA.That make the reaction occurt under a homogeneous system
and speed upthe reaction rate dramatically. Another
intermidiate BHCN is synthesis by transesterification method.In
theesterizing reaction,we choose 3 kinds of catalyst which we
often use and thenfind the activity of the 3 different catalysts
is like this:Ti(OBu)4 > Sb2O3 > Zn(CH3COO)2.2H2O We use the
method of copolymerization to synthesis copolyester in
differentproportion and test their physical properties.In that
we find that if the feedratio is between 90/10 to 60/40 in the
series of PCEN copolymer,it will resultin amorphous polymer.
While in the experiment of PCET polyester,when the feedratio of
EG/1,4-CHDM is between 85/15 to 60/40,the product of polyester
is belong to amorphous polyester with random structure.From the
thermal propertyanalysis,we also can see the copolyester all
have good thermalstability.
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