The colour tests and FTIR analyses showed good plasticizer
absorption, with no apparent degradation caused by curing, as
white and opaque surfaces were obtained in prepared PVCeESBO
plastisols as well as in gaskets for metal lids used in food packaging.
Disappearance of the characteristic epoxy peak at 823 cm1 in FTIR
tests gives confirmation of the ring-opening step with HCl scavenging
by the epoxy group from ESBO and the role of this plasticizer
in the stabilization of PVC at high temperatures. These results also
indicated that there is no need for further addition of extra stabilizers
to PVCeESBO plastisols resulting in simpler formulations.
DSC analyses carried out on pure plasticizer showed the presence of
crystalline polymorphism in ESBO. Therefore, it could be concluded
that the thermal degradation of PVC is clearly limited by the
addition of ESBO at amounts higher than 1e2 wt%, and especially if
ESBO concentrations are in the range of values used for plasticizers
(30e40 wt%). This conclusion, in addition to the inherent biodegradable
and environmentally friendly character of ESBO, gives this
compound an important added value for many applications, such as
food packaging.
It was observed that ESBO composition in commercial gaskets
was lower than those reported in the literature. ESBO is usually
mixed with co-plasticizers, which could be a reasonable practice
used by industry in order to fulfil the specific migration limits of
each plasticizer. However, since ESBO was seen to play a role in
thermal stability of PVC it could be a good alternative as a primary
plasticizer and/or stabilizer for PVC plastisols
The colour tests and FTIR analyses showed good plasticizer
absorption, with no apparent degradation caused by curing, as
white and opaque surfaces were obtained in prepared PVCeESBO
plastisols as well as in gaskets for metal lids used in food packaging.
Disappearance of the characteristic epoxy peak at 823 cm1 in FTIR
tests gives confirmation of the ring-opening step with HCl scavenging
by the epoxy group from ESBO and the role of this plasticizer
in the stabilization of PVC at high temperatures. These results also
indicated that there is no need for further addition of extra stabilizers
to PVCeESBO plastisols resulting in simpler formulations.
DSC analyses carried out on pure plasticizer showed the presence of
crystalline polymorphism in ESBO. Therefore, it could be concluded
that the thermal degradation of PVC is clearly limited by the
addition of ESBO at amounts higher than 1e2 wt%, and especially if
ESBO concentrations are in the range of values used for plasticizers
(30e40 wt%). This conclusion, in addition to the inherent biodegradable
and environmentally friendly character of ESBO, gives this
compound an important added value for many applications, such as
food packaging.
It was observed that ESBO composition in commercial gaskets
was lower than those reported in the literature. ESBO is usually
mixed with co-plasticizers, which could be a reasonable practice
used by industry in order to fulfil the specific migration limits of
each plasticizer. However, since ESBO was seen to play a role in
thermal stability of PVC it could be a good alternative as a primary
plasticizer and/or stabilizer for PVC plastisols
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