Job description

Polymer chain structural heterogeneities can play a major role in determining polymer dynamics and thermal stability (as bounded by the glass transition temperature (Tg) above which polymers lose dimensional stability), with the potential to enable rational control of transport and dynamic mechanical properties. While copolymerization and mixing have long been employed in tuning these properties, their usage has generally been prescribed and guided by classical Tg mixing rules that suggest a limitation to interpolating between the properties of existing polymers. Recent work suggests a new opportunity: copolymerization of monomers with particularly favorable or unfavorable interactions can lead to large deviations from these mixing rules, enabling alloyed copolymers with thermal envelopes far outside those of the homopolymers corresponding to their constituents. Moreover, sequence effects on Tg indicates the even more profound possibility of achieving large variations in Tg, transport, and mechanical properties at fixed composition and chemistry simply by varying sequence. This suggests the possibility of a transformational decoupling of chemical and physical properties in next generation polymers. This effort aims to understand these effects at a molecular level and establish next-generation design rules for sequence controlled copolymers with targeted Tg, transport, and mechanical properties. To do so, this effort will combine experiments probing local Tg and dynamics in copolymers with both atomistic and coarse-grained simulations providing molecular-level understanding of the relationship between monomer interactions and sequence, segmental packing, glassy mechanics, and dynamics and Tg. The project is a collaboration between the Priestley and Register groups at Princeton (experiments) and Simmons group at the University of South Florida (simulations). At Princeton, we seek a recent doctorate (chemistry, chemical engineering, materials science, or related field) with expertise in the synthesis of well-defined polymers by controlled/living polymerizations, and/or other air-sensitive syntheses (glove box, Schlenk line, or similar). Prior experience in macromolecular characterization (NMR, GPC), thermal analysis (DSC) or other physical property measurements (including fluorescence and dielectric spectroscopy) would be added plusses. Candidates should have the strong interpersonal and communications skills required to work productively with researchers from other groups, to mentor graduate and undergraduate students, and to support the research team. Princeton University is committed to diversity, equity and inclusion. We actively seek students, faculty, and staff of exceptional ability and promise who share in our commitment to excellence in teaching and scholarship, and who will bring a diversity of viewpoints and cultures. In doing so, we encourage applications from individuals whose personal identities, backgrounds and/or interests (as demonstrated by their research, service, mentoring and/or advising) align with our commitments and will contribute to the excellence and diversity, in its broadest terms, of our department. Applicants should apply at https://www.princeton.edu/acad-positions/position/28121 and include a CV (including a list of publications), research interest statement (a discussion of past research and expertise), and contact information for three references. Appointments at Princeton University are for one year with the possibility of renewal pending satisfactory performance and continued funding. This position is subject to the University's background check policy.

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