PIMS brings transparency, impact resistance,and thermal stability to PMMA

In a study published in NPG Asia Materials, we have unveiled a novel approach to creating impact-resistant, haze-free poly(methyl methacrylate) (PMMA) through photopolymerization-induced microphase separation (photoPIMS). The work, led by Suchan Cho and Young Soo Lee from our group and the Suk-kyun Ahn group from Pusan National University and the Korea Research Institute of Chemical Technology (KRICT), not only addresses the challenges associated with traditional PMMA but also establishes a versatile platform for developing advanced optical materials, paving the way for future innovations in polymer science. For the complete study, visit the following link: https://doi.org/10.1038/s41427-025-00618-3.

Traditional PMMA is renowned for its clarity and transparency but falls short due to its brittleness, often necessitating modifications that can cloud its optical properties. Standard methods to enhance toughness typically involve the addition of rubbery domains, which can scatter light and create haze, particularly at elevated temperatures. This new research addresses that limitation head-on.

The team successfully developed a new class of nanostructured PMMA that maintains optical clarity while offering exceptional impact resistance. By leveraging the photoPIMS process, we were able to integrate polymerization, microphase separation, and cross-linking into a single, efficient step. This innovative method enables precise control over the nanostructure, resulting in materials that are not only robust but also ideally suited for 3D printing applications.

During the photoPIMS process, unique bicontinuous nanostructures form, combining glassy PMMA with cross-linked rubbery poly(n-butyl acrylate) (PnBA) domains. These structures are confined to dimensions below 50 nm, ensuring that the material remains clear while effectively dissipating stress. Notably, the new PMMA variant—referred to as PIMS-engineered PMMA or PePMMA—demonstrated toughness comparable to commercial impact-modified PMMA while retaining its dimensional stability even at temperatures exceeding 120 °C.

“By integrating these advanced materials with direct ink writing (DIW) 3D printing, we’re able to rapidly fabricate intricate and transparent structures that possess remarkable thermal and mechanical integrity,” said Sungmin Park, the principal researcher at KRICT who participated in this work as one of the co-corresponding authors.

The implications of this research are vast, promising applications across a range of industries, from optics to aerospace, where transparent materials can withstand demanding conditions without compromising on clarity or durability.

---