## 4 Conclusions  
In summary, we synthesized chain-end furan functionalized hairy nanoparticles (HNP-Fs) with a hard polystyrene (PS) core and soft polydimethylsiloxane (PDMS) shells via a one-pot approach. The furan functionalized HNPs were synthesized, combining sequential living anionic polymerization and hydrosilylation reaction. Differential scanning calorimetry showed the presence of two thermal transitions, indicative of the presence of a polydimethylsiloxane soft phase and a polystyrene hard phase, suggesting that the HNPs are a thermoplastic elastomer. Additionally, furan-functionalized PS and PDMS were successfully synthesized and reacted with bis-maleimide (BMI). The activation energy of the forward Diels-Alder reaction of BMI with HNP-F, PS-F, and PDMS-F was determined to be 46.57, 67.61, and 54.22 kJ mol\({}^{-1}\), respectively. These results indicated that the activation energy (\(E_{a}\)) was highly dependent on the polymer shape and flexibility. HNP-F, due to its shape, flexibility of hairs, and uniformity, needs less energy to react with BMI compared to linear polymers. Moreover, SEM and AFM images show uniform crosslinked surfaces originating from HNP-F. BMI can crosslink the HNP-F by heating it to 50 \({}^{\circ}\)C and decrosslink it by heating to 150 \({}^{\circ}\)C for one minute to recover the uncrosslinked HNP-F. The recovered HNP-F can be crosslinked again by heating it to 50 \({}^{\circ}\)C for two hours. The most interesting conclusion is how quickly and easily the decrosslinking reaction takes place, and it strongly suggests the utilization of HNPs as building blocks for recoverable and reusable networks. The study indicates furan functionalized HNPs are promising TPE building blocks for facile recovery. The HNP-F can be easily reprocessed and potentially minimize thermoplastic elastomeric waste in the environment.  
**Supplementary Materials:** The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/polym16223117/s1](https://www.mdpi.com/article/10.3390/polym16223117/s1)]([https://www.mdpi.com/article/10.3390/polym16223117/s1](https://www.mdpi.com/article/10.3390/polym16223117/s1)), Procedures for synthesis of 2-vinylfuran, PDMS-F, and PS-F (Scheme S1). 1H NMR spectra of 2-vinylfuran (Figure S1); FTIR and 1H NMR  
Figure 10: SEM image of (**a**) uncrosslinked HNP-F with BMI, (**b**) crosslinked HNP-F with BMI, and (**c**) decrosslinked HNP-F after heating at 150 \({}^{\circ}\)C. AFM images of crosslinked HNP-F with BMI at different magnifications (**d**,**e**).  
spectra of PS-F, PS-SiH, PDMS-F, and PDMS-SiH [Figures S2(a,b) and S3]. UV-Vis spectra and reaction kinetic plots (Figure S4). SEM images of before and after Diels-Alder reaction of PS-F and PDMS-F with BMI (Figure S5).  
Supervisor and Conceptualization, I.M.K. and M.H.U.; Writing--original draft preparation, I.M.K., S.A. ([PERSON]) and M.H.U.; Methodology, I.M.K., E.A., M.H.U. and S.A. ([PERSON]); Investigation, M.H.U., E.A., S.A. ([PERSON]), N.W. and S.A. ([PERSON]); Validation, M.H.U., E.A., S.A. ([PERSON]), N.W., I.M.K. and S.A. ([PERSON]): Data curation, S.A. ([PERSON]), E.A. and M.H.U. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the US Army Research Office WN911 NF2010272; NSF DMR-2122147 and NSF PREC-2216807.  
Not applicable.  
Data availability Statement: Data supporting this study are included within the article.  
The authors declare no conflicts of interest.