Thermal analysis – an effective ch aracterization method of polymer [602464]

Thermal analysis – an effective ch aracterization method of polymer
films formed by poly(vinyl acetate)

Adriana SAMIDE1, Bogdan TUTUNARU1, Claudia MERI ȘANU1, Cristian
TIGAE1, Cezar SPÎNU1
1University of Craiova, Faculty of Sciences, De partment of Chemistry, 107i Calea Bucuresti,
Craiova, Romania
Poly(vinyl acetate), further named as PAcV, is a non-toxic polymer with many industrial and medical applications, that can be synt hesized by vinyl acetate radical
polymerization/electropolymerization in alcoholic solution [1] or in aque ous phase containing
an emulsifier known as emulsion/miniemulsion polymerization [2, 3]. To prepare a control
agent for metal corrosion, PAcV was synthesized, under our laboratory conditions, by emulsion polymerization of vinyl acetate using poly(vinyl alcohol) as emulsifier, Fenton
reagent as reaction initiator, and acid acetic as aqueous phase pH-regulator. A white and
viscous emulsion containing 31% solid substan ce was obtained. PAcV synthesized film was
comparatively characterized by thermal analysis with a polymer film obtained from standard
Sigma Aldrich product, simultaneously record ing TG, DTG and DSC cu rves (Fig.1), with
temperature scan rate of 10
oC/min using a Perkin Elmer thermal analyzer with Pyris software.
02040608010 0
0 250 500 750 1000Temperature/ oCMass/ %PAcV standard
Synthesized PAcVTG curves
-25-1 5-55
0 250 500 750 1 000
Temperature/ oCDerivative mass/ % min-1 PAcV standard
Synthesized PAcVDTG curves
-1 0
0
10
20
30
0 250 500 750 1 000
Temperature/ oCHeat flow/ mW
endo upPAcV standard
Synthesized PAcVDSC curves

Fig. 1 Thermoanalytical curves recorded for PAcV standard film and PAcV film synthesized.
As Fig. 1 (TG curves) shows, for both the st andard film and the synthesized film the
highest mass loss is observed in temperatur e range between 295° C and 375 °C, where the
macromolecular chain is cleaved and acetic acid is released, resulti ng unsaturated compounds.
The mass loss notified values of the standard (68.75%) and synthesized film (66.93%) are close
to that expected (69.76 %) confirming the prev iously assumed ones. The maximum mass loss
is highlighted at 340 °C for the standard a nd 353 °C for the synthesi zed film, respectively
(DTG curves), being followed by the endothe rmic peaks on the DSC curves around 340 °C.
The similarities between processes suggest th at the values of polymerization degree and
average molecular mass of synthesized polymer are close to those of the standard compound.

[1] A. Samide, G. Bratulescu, C. Merisanu et al. J. Appl. Polym. Sci., 136 (2019) 47320
[2] S. Copelli, M. Derudi, J. Sempere et al. J. Hazard. Mater., 192 (2011) 8
[3] T. Segura, M. Menes-Arzate, F. León et al. Polymer, 102 (2016) 183

1) Poster presentation