Editorial Type:
Article Category: Research Article
 | 
Online Publication Date: 07 Aug 2019

INFLUENCE OF FLUOROACRYLATE CURE SITE MONOMER ON THE THERMAL AND MECHANICAL PROPERTIES OF THE POLYACRYLIC ESTER ELASTOMER

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Page Range: 395 – 413
DOI: 10.5254/rct.19.80440
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ABSTRACT

The rubber industry is facing strong challenges in recent times because of imposed stringent standards on the performance of a product under adverse thermal and chemical applications. The choice of proper elastomer plays a significant role in imparting useful product performance. A new type of acrylic rubber with a fluoroacrylate cure site monomer was developed. Structural characterization, such as Fourier-transform infrared spectroscopy and nuclear magnetic resonance (NMR), suggested the presence of four different monomer units. Two-dimensional NMR spectroscopy analysis was also performed to support the assessment of the resonance peaks of coupled nuclei spins in the terpolymer. The newly developed acrylic rubber exhibited superior thermal and mechanical properties. Hexamethylenediamine carbamate in combination with zinc oxide (ZnO) was used as the curing package for the new elastomer. ZnO acts as an acid scavenger to avoid the micro-void formation. The new elastomer with a higher number of cross-link junctions resulted in superior mechanical and thermal properties as well as swelling resistance of the vulcanizate both with and without carbon black.

Copyright: 2020
Fig. 1
Fig. 1

Generalized structure of ACM_F.

Fig. 2
Fig. 2

Cure curves for (a) ACM_V and (b) ACM_VCB50.

Fig. 3
Fig. 3

1H NMR spectra of ACM_F elastomer with the assignment of different protons.

Fig. 4
Fig. 4

13C NMR spectra of ACM_F elastomer with the assignment of different carbon atoms.

Fig. 5
Fig. 5

COSY (1H–1H) spectra of ACM_F.

Fig. 6
Fig. 6

FTIR spectra of polyacrylic ester with fluoroacrylate cure site monomer.

Fig. 7
Fig. 7

DSC thermogram of polyacrylic ester elastomers with different cure site monomer.

Scheme 1
Scheme 1

(a) Secondary interaction between the fluorine atom of the cure site monomer and carbonyl oxygen atom of the acrylic ester group for ACM_F and (b) intramolecular H-bonding between the acidic hydrogen atom of the acid group and carbonyl oxygen atom of the acrylic ester group for ACM.

Fig. 8
Fig. 8

Thermogravimetric analysis of polyacrylic ester with different cure site monomer.

Fig. 9
Fig. 9

Typical (a) FWO and (b) KAS plots for pristine ACM_F at different values of α.

Fig. 10
Fig. 10

Stress–strain plots of pristine ACM_V and ACM_FV with and without carbon black.

Fig. 11
Fig. 11

Thermogravimetric analysis of different systems.

Fig. 12
Fig. 12

Percentage swelling plots for the cross-linked ACM and ACM_F samples and their carbon black–filled composites in methylethylketone at 25 °C.

Contributor Notes

*Corresponding author. Email: akbhowmick@uh.edu, anilkb@rtc.iitkgp.ernet.in
Received: 01 Mar 2019
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