## 5 Conclusions  
The proposed multivariate approach facilitated insights into the influence of the wall's chemical structure on mechanical properties and delivery efficiency.  
For acrylic-based microcapsules, a reduction in the \(MW_{c}\) of the monomer mixture from 172 g/mol to 100 g/mol led to enhanced performance. Specifically, there was an improvement in _RFD_ (rising from \(7.7\pm 5.1\times 10^{-1}\) to \(1.1\times 10^{2}\pm 9.7\times 10^{-1}\) N/mm) and _Encapsulation Efficiency_ (increasing from 0% to 95.1 \(\pm\) 0.3%). It is postulated that this trend primarily stems from an augmented cross-linking density. This density serves as a physical barrier, curtailing chain mobility and amplifying the rigidity of the polymer network.  
Within the purview of this investigation, samples CAP \(1\,1\,0\,10\,1\,\), CAP \(0.3\,1\,0\,10\,7\,1\,\), and CAP \(1\,0.5\,1\,0\,1\,\)--comprising mixtures of (oligoglycolate diacrylate) ethylene glycol and aromatic hexafunctional urethane acrylate--registered the pinnacle of _On-Fabric delivery_ (roughly 300 nmol/L) in the context of _Liquid Fabric Enhancers_ (_LFE_). The 100% aromatic hexafunctional urethane acrylate system emerged as the most favorable, attributed to its optimal \(MW_{c}\) of 128 g/mol. This resulted in the prime _On-Fabric delivery_ (307.5 \(\pm\) 45.7 nmol/L), bolstered by an _RFD_ of \(8.5\times 10^{1}\pm 6.1\times 10^{-1}\) N/mm and an _Encapsulation Efficiency_ of 94.3 \(\pm\) 0.2%.  
By strategically selecting the molecular structure of the capsule wall, primarily through pinpointing the ideal \(MW_{c}\) range, it is feasible to manipulate the cross-linking density. This, in turn, impacts the mechanical attributes of the encapsulating shell. Such adjustments are paramount for tailoring the delivery efficiency to suit specific applications.  
Consequently, more efficacious microcapsules pave the way for reducing the quantity of perfume and actives in formulation. This offers a more judicious utilization of chemicals, enhancing sustainability, and also ensures the potential for refining other microcapsule attributes, including environmental ramifications and affinity to core materials.  
The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/polym15204158/s1](https://www.mdpi.com/article/10.3390/polym15204158/s1)]([https://www.mdpi.com/article/10.3390/polym15204158/s1](https://www.mdpi.com/article/10.3390/polym15204158/s1)), Paragraph S1: Encapsulation Efficiency, Figure S1: Distribution of values (left-side) and Shapiro-Wilk statistic test on the EE data (right side); Equation (S1). Reference [42] are cited in the Supplementary Materials.  
Conceptualization, M.G., J.S., M.S. and E.B.; methodology, M.C. and E.R.; validation, M.C. and E.R.; investigation, M.C., E.R. and R.D.P.; resources, J.S.; data curation, M.C.; writing--original draft preparation, M.C., E.R. and M.G.; writing--review and editing, M.C., E.R. and M.G.; supervision, M.G.; funding acquisition, J.S. and E.B. All authors have read and agreed to the published version of the manuscript.  
This research was funded by The Procter & Gamble Company.  
Not applicable.  
The data presented in this study are available on request from the corresponding author. The data are not publicly available due to their deposition on an offline disk, MEMTEC group, URV, Tarragona, Spain.  
[PERSON] and [PERSON] are gratefully acknowledged for the helpful discussion.  
Authors [PERSON], [PERSON], and [PERSON] are the company's Procter & Gamble employees. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.