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Furthermore, this polymer exhibits a hole mobility of 0.1 cm2 V -1 s -1 even at 100% strain or after recovered from strain, which reveals prominent continuity and viscoelasticity of the polymer thin film.
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It is observed that the fused thiophene diketopyrrolopyrrole-based polymer, when incorporated with branched side chains and an additional thiophene spacer in the backbone, exhibits improved mechanical endurance and, in addition, does not show crack propagation more » until 40% strain.
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Structure–property relationships (especially in both side chain and backbone engineering) are investigated for a series of poly(tetrathienoacene-diketopyrrolopyrrole) polymers. Understanding the distribution and behavior of both crystalline domains and amorphous regions in conjugated polymer films, upon an applied stress, shall provide general guiding principles to design stretchable organic semiconductors.
The design of polymer semiconductors possessing high charge transport performance, coupled with good ductility, remains a challenge. more » This facile method gives insights into the physical nature of amorphous phases in conjugated polymers for better revealing their structure-property relationships, which will guide the designs of new materials with optimized electrical and mechanical properties in the future. Furthermore, the weight fractions of MAF and RAF with various film thicknesses are qualitatively analyzed based on the heat capacity step of each amorphous fraction during the glass transition. The Tgs of diketopyrrolopyrrole-based conjugated polymer thin films are also identified by the same method, with both Tgs showing a decreased value compared to those of bulk samples. Tgs of MAF and RAF increase and decrease with increasing size of fused thiophene units in the backbone, respectively. The detected relaxations were interpreted, in agreement with existing observations in similar systems, as a side-chain relaxation (low temperature), mobile amorphous fractions (MAF), and rigid amorphous fractions (RAF). In this work, alternating current (ac) chip calorimetry and flash differential scanning calorimetry (flash DSC) are applied to successfully identify the Tgs and segmental relaxations of conjugated polymers. Despite some well-developed methods that exist for detecting Tg of conjugated polymers, there is still a need for the combination of advanced calorimetric methodologies to characterize Tg in a broad range of temperatures and scales from bulk to nanometer-thin films. Plastic surgery services like body contouring, breast enhancement and facial surgery are designed to help correct and/or restore form and function.Ĭhoosing a plastic surgeon can be a difficult decision as you are deciding who to trust with your outward appearance.Īt Hattiesburg Clinic Plastic Surgery, our physicians are committed to providing quality care.The glass transition temperature (Tg) of conjugated polymers is a crucial physical parameter that governs their mechanical and electrical properties for applications from sensor technology to skin-like electronics. For this reason, it is important to choose a physician with extensive training and education, and many years of experience with performing surgery procedures. Hattiesburg Clinic Pa is a specialist practice in Hattiesburg, MS, USA. With nearly 50 years of combined experience, the Hattiesburg Clinic Plastic Surgery team has developed a quality reputation for serving patients of South Mississippi. There are 430 providers affiliated with this practice. Richard Pecunia practices Plastic & Reconstructive Surgery in Hattiesburg, MS - USA. Our board-certified plastic surgeons, Richard A.
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