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SUMMARY:3D-Printing Structural Color from Block Copolymers and the Role of 
 Polymer Architecture
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20193201T000000
UID:2026-04-21-23-50-50@natsci.colostate.edu
DTSTAMP:20260421T235050
Description:Research Seminar Abstract\n\nPhotonic crystals (PC) are periodi
 c nanostructures engineered in nature to reflect different wavelengths of 
 light for camouflage\, signaling\, photosynthesis\, and heat control. Thes
 e natural photonic crystals can be mimicked through the self-assembly of b
 lock copolymers (BCPs). The challenge of BCP self-assembly to photonic cry
 stals is that chain entanglement often impedes the self-assembly of linear
  BCPs into a periodic structure of required domain size. By engineering th
 e macromolecular architecture to reduce the BCP’s capacity for chain ent
 anglement in order to enable self-assembly to large nanostructures\, it is
  possible to provide an approach to polymer based visible-light reflecting
  PCs. For example\, bottlebrush BCPs are often used to reach domain sizes 
 large enough to reflect visible wavelengths of light and beyond. However\,
  recently it has been shown that rigid\, yet linear\, BCPs can self-assemb
 le to photonic crystals that reflect wavelengths of light across the visib
 le light spectrum and into the near infrared depending on the molecular we
 ight of the polymer.\n\nThese rigid linear polymers have a unique dendriti
 c architecture that promotes interesting dynamic melt and mechanical prope
 rties. These dendritic polymers possess many characteristics that are simi
 lar to those of bottlebrush polymers when compared to the responses that a
  non-rigid\, linear polymer would produce. These responses include a rod-l
 ike conformation\, a reduced capability for chain entanglement\, and lower
  glassy moduli compared to non-rigid\, linear polymers. Further\, dendriti
 c BCPs possess high free energy parameters\, as well as glass transition t
 emperatures below melt extrusion 3D printing operating conditions and are 
 able to self-assemble into photonic crystals during the process of 3D prin
 ting. Lastly\, varying the molecular weight of the BCP allows selective re
 flection of the PCs for wavelengths of light across the visible spectrum. 
 4:00 pm
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