![]() ![]() 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. Thomas Aquinas Catholic Church.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. Pecunia resides in Hattiesburg, Miss., with his wife and their three children. Pecunia is an active member of the American Society of Plastic Surgeons, American College of Surgeons, Southeast Society of Plastic and Reconstructive Surgeons, South Mississippi Medical Society, American Medical Association and the Mississippi State Medical Association.ĭr. He has special interest in cosmetic and breast surgery, as well as body contouring procedures, facial procedures and hand and upper extremity procedures.ĭr. ![]() Pecunia maintains a broad interest in all aspects of plastic surgery. Pecunia has been board certified by the American Board of Plastic Surgery since 1996 and maintains his board certification through the maintenance certification program.ĭr. Pecunia served a general surgery residency at Allegheny General Hospital in Pittsburgh, Pa., He then completed a plastic surgery residency at the University of Mississippi Medical Center in Jackson, Miss., in 1994.ĭr. He then returned to his native New Orleans to attend Louisiana State University School of Medicine, where he received his medical degree in 1986.ĭr. Pecunia received a Bachelor of Science from Louisiana State University in Baton Rouge, La., in 1981. ![]() “We are able to get people immediate results and see their confidence skyrocket.” “I love working in plastics because here, success stories are a daily routine,” Pecunia said. ![]() Pecunia, MD, FACS, joined Hattiesburg Clinic in 1994 and began the department of Plastic Surgery as the clinic’s first plastic and reconstructive surgeon. ![]()
0 Comments
Leave a Reply. |