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. 2023 Apr 17;13(18):12023-12034.
doi: 10.1039/d3ra01142a.

Synthesis and characterization of low surface energy thermoplastic polyurethane elastomers based on polydimethylsiloxane

Jie Sun  1 , Xiaobin Zou  1 , Zhiqian Xu  1 , Zhen Ge  1
Affiliations

Synthesis and characterization of low surface energy thermoplastic polyurethane elastomers based on polydimethylsiloxane

Jie Sun et al. RSC Adv. .

Abstract

Organosilicon modified polyurethane elastomers (Si-MTPUs) were synthesized in order to improve the anti-graffiti property of thermoplastic polyurethane elastomers (TPUs). Si-MTPUs were prepared from polydimethylsiloxane (PDMS) and polytetramethylene glycol (PTMG) as mixed soft segment, 1,4-butanediol (BDO) and imidazole salt ionic liquid N-glyceryl-N-methyl imidazolium chloride ([MIMl,g]Cl) used as chain extender, and 4,4'-dicyclohexylmethane diisocyanate (HMDI). The structure, thermal stability, mechanical properties and physical crosslinking density of Si-MTPUs were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetry analysis (TGA), mechanical test and low field nuclear magnetic resonance. Surface energy and water absorption were characterized by static contact angle test and water resistance test, and anti-graffiti and self-cleaning properties were characterized with water, milk, ink, lipstick, oily markers and spray paint. It was found that the mechanical properties of Si-MTPU-10 with the content of PDMS 10 wt% were optimized, with a maximum tensile strength of 32.3 MPa and elongation at break of 656%. Surface energy reached the minimum value of 23.1 mN m-1 with the best anti-graffiti performance, which no longer decreased with the increase of PDMS contents. This work provides novel idea and strategy for the preparation of low surface energy TPUs.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Scheme 1
Scheme 1. Preparation of Si-MTPUs.
Fig. 1
Fig. 1. FTIR spectrum of Si-MTPUs (a) and FTIR spectrum in the Si–CH3 stretching region from 700 to 900 cm−1 (b).
Fig. 2
Fig. 2. Fitting peak separation in FTIR spectrum of –CO (a: Si-MTPU-0, b: Si-MTPU-5, c: Si-MTPU-10, d: Si-MTPU-15, e: Si-MTPU-20).
Fig. 3
Fig. 3. Surface appearance of Si-MTPUs before and after graffiti removal.
Fig. 4
Fig. 4. The phenomenon of self-cleaning test of Si-MTPUs (a: Si-MTPU-0, b: Si-MTPU-5, c: Si-MTPU-10, d: Si-MTPU-15, e: Si-MTPU-20).
Fig. 5
Fig. 5. The water absorption results of Si-MTPUs.
Fig. 6
Fig. 6. TGA curves (a) and DTG curves (b) of Si-MTPUs.
Fig. 7
Fig. 7. DSC curves of Si-MTPUs.
Fig. 8
Fig. 8. Mechanical properties of Si-MTPUs.
Fig. 9
Fig. 9. Cross-linking density values of Si-MTPUs.
Fig. 10
Fig. 10. Antibacterial property of Si-MTPU-10.
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