Dr. Lucas Polo da Fonseca

@article{PoloFonseca2025,

title = {Enhancing the Self‐Assembly of Step‐Growth Polymers by Narrowing Their Molar Mass Distribution: A Dynamic Bond‐Mediated Approach},

author = {Lucas Polo Fonseca and Shaghayegh Hamzehlou and Olaia Garagarza and Daniele Mantione and Aritz Lamas and Xabier Lopez de Pariza and Fermin Elizalde and Marta Ximenis Campins and Amaia Agirre and Gabriel Perli and Haritz Sardon},

doi = {10.1002/ange.202509710},

issn = {1521-3757},

year  = {2025},

date = {2025-09-22},

journal = {Angewandte Chemie},

volume = {137},

number = {39},

publisher = {Wiley},

abstract = {AbstractStep‐growth polymerization (SGP) typically produces polymers with exceptional versatility in terms of applications, but its inherently uncontrolled nature leads to broad molecular weight distributions (Đ) and consequently polymers with poor nanostructure control in comparison to chain growth polymers. In this study, we provide a solution to this long‐lasting problem by introducing a new concept, asymmetric dynamic bond mediated polymerization (ADBP). In this case, the polymerization between asymmetric and reversibly deactivated AA’‐type dielectrophiles and B2‐type dinucleophiles has a preferential reaction pathway between the functionality A’ of the asymmetric AA’ monomer with B2. We observe that this polymerization allows us to achieve better control of the step‐growth process where in the first stage only well‐defined trimers and dimers are primarily formed up to conversion (p) ≤ 0.6, followed by their polymerization stage (p ≥ 0.6). This leads to polymers with reduced Đ (<1.5), in comparison to traditional SGP, and improved molar mass control. Such technique is further exploited to prepare polyurethanes with Đ = 1.2, which exhibit the ability to form microphase‐separated domains with higher ordering, giving rise to polyurethane thermosets with superior mechanical properties compared to a traditional SGP analog.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Prasad2025,

title = {Lab safety alert: a real case of isocyanate exposure},

author = {Akshaya Maria Prasad and Gabriel Perli and Marta Ximenis and Ainara Tejero and Agurtzane Mugica and Lucas Polo Fonseca and Ainara Sangroniz and Fernando Vidal and Haritz Sardon},

doi = {10.1039/d5py90051d},

issn = {1759-9962},

year  = {2025},

date = {2025-06-24},

journal = {Polym. Chem.},

volume = {16},

number = {25},

pages = {2905--2909},

publisher = {Royal Society of Chemistry (RSC)},

abstract = {A real-world laboratory accident highlights underestimated dermal risks posed by reactive isocyanates. First-aid actions and essential safety insights are shared to reinforce best laboratory safety practices.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Lamas2024,

title = {Exploiting the Base‐Triggered Thiol/Vinyl Ether Addition to Prepare Well‐Defined Microphase Separated Thermo‐Switchable Adhesives},

author = {Aritz Lamas and Lucas Polo Fonseca and Cécile Moussard and Daniela de Morais Zanata and Gabriel Perli and Marta Ximenis and Xabier Lopez de Pariza and Guillem Seychal and Marco Caliari and Miren Itxaso and Robert Aguirresarobe and Iñigo Calvo and Haritz Sardon},

doi = {10.1002/adfm.202412584},

issn = {1616-3028},

year  = {2025},

date = {2025-01-00},

journal = {Adv Funct Materials},

volume = {35},

number = {2},

publisher = {Wiley},

abstract = {AbstractSwitchable adhesives are materials of utmost importance due to their capability of having their adhesion/cohesion properties reversibly triggered upon stimuli, allowing on‐demand surface attaching/detaching. Still, several challenges mainly associated with complex uncontrolled chemical processes hinders their production. In this study, it is found that unexpectedly vinyl ethers are able to react with thiols in the presence of a catalytic concentration of base, which allows the preparation of well‐defined phase‐separated switchable adhesives. Indeed, these findings show that base‐catalyzed thiol‐acrylate and thiol‐vinyl ether are highly orthogonal, making the acrylate reaction faster. This is explored to react in the first stage thiols with acrylates in the presence of vinyl ethers to end‐cap all the oligomers with stable vinyl ethers and suppress undesirable disulfide formation. In a second stage the UV‐triggered thiol‐ene “click reaction” is carried out, forming the network. It is shown that the network prepared by this approach presents superior adhesion due to greater backbone length, a controlled crosslinking motif, and better‐defined microphase separation. Additionally, the adhesives made by this strategy are thermo‐switchable due to the temperature‐triggered base‐catalyzed thioether dynamic covalent character at 200 °C. Despite providing superior adhesive properties, the proposed technology endows scalable, thermo‐switchable, and O2‐resistant adhesives with huge industrialization potential.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Matxinandiarena2024,

title = {Crystallization-Induced Self-Assembly of Poly(ethylene glycol) Side Chains in Dithiol–yne-Based Comb Polymers: Side Chain Spacing and Molecular Weight Effects},

author = {Eider Matxinandiarena and Mario Iván Peñas and Brennan J. Curole and Monika Król and Lucas Polo Fonseca and Janne Ruokolainen and Scott M. Grayson and Leire Sangroniz and Alejandro J. Müller},

doi = {10.1021/acs.macromol.4c00527},

issn = {1520-5835},

year  = {2024},

date = {2024-05-28},

journal = {Macromolecules},

volume = {57},

number = {10},

pages = {4906--4917},

publisher = {American Chemical Society (ACS)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}