Synthetic Route of C7H13BrO2. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: 2-(2-Bromoethoxy)tetrahydro-2H-pyran, is researched, Molecular C7H13BrO2, CAS is 17739-45-6, about Tuning the Mechanical Properties of a Polymer Semiconductor by Modulating Hydrogen Bonding Interactions. Author is Zheng, Yu; Ashizawa, Minoru; Zhang, Song; Kang, Jiheong; Nikzad, Shayla; Yu, Zhiao; Ochiai, Yuto; Wu, Hung-Chin; Tran, Helen; Mun, Jaewan; Zheng, Yu-Qing; Tok, Jeffrey B.-H.; Gu, Xiaodan; Bao, Zhenan.
Conjugation breakers (CBs) with different H-bonding chemistries and linker flexibilities are designed and incorporated into a diketopyrrolopyrrole (DPP)-based conjugated polymer backbone. The effects of H-bonding interactions on polymer semiconductor morphol., mech. properties, and elec. performance are systematically investigated. We observe that CBs with an H-bonding self-association constant >0.7 or a denser packing tendency are able to induce higher polymer chain aggregation and crystallinity in as-casted thin films, resulting in a higher modulus and crack on-set strain. Addnl., the rDoC (relative degree of crystallinity) of the stretched thin film with the highest crack on-set strain only suffers a small decrease, suggesting the main energy dissipation mechanism is the breakage of H-bonding interactions. By contrast, other less stretchable polymer films dissipate strain energy through the breakage of crystalline domains, indicated by a drastic decrease in rDoC. Furthermore, we evaluate their elec. performances under mech. strain in fully stretchable field-effect transistors. The polymer with the highest crack on-set strain has the least degradation in mobility as a function of strain. Overall, these observations suggest that we can aptly tune the mech. properties of a polymer semiconductor by modulating intermol. interactions, such as H-bonding chem. and linker flexibility. Such understanding provides mol. design guidelines for future stretchable semiconductors.
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