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Conventional strategies, particularly nanocomposite approaches, often struggle to simultaneously achieve high\n                    <jats:italic>\u03bb<\/jats:italic>\n                    and low\n                    <jats:italic>\n                      D\n                      <jats:sub>f<\/jats:sub>\n                    <\/jats:italic>\n                    without compromising processability or mechanical integrity. Herein, a semicrystalline polyimide (TAHQ\/TFMB) architecture is initially established by circumventing the amorphous nature of fluorinated systems via rigid\u2010rod backbone design and programmed thermal processing. Subsequently, minor dynamically exchangeable siloxane segments (\u2264 1 mol%) act as molecular disentanglement switches, triggering topological rearrangement that promotes the formation of widely distributed crystal nuclei and enables the subsequent development of large\u2010scale crystalline domains, ultimately yielding an enhanced crystallinity exceeding 50%. The optimally designed film with merely 0.25 mol% siloxane exhibits an enhanced in\u2010plane\n                    <jats:italic>\u03bb<\/jats:italic>\n                    of 2.33 W\u00b7m\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00b7K\n                    <jats:sup>\u22121<\/jats:sup>\n                    and an ultralow\n                    <jats:italic>\n                      D\n                      <jats:sub>f<\/jats:sub>\n                    <\/jats:italic>\n                    of 0.00142 at 10 GHz. This synergy facilitates the first realization of a broadband thermoacoustic generator featuring an all\u2010organic substrate and a flexible hairpin bandpass filter with excellent signal transmission performance. Furthermore, the DBPI\u20100.25 film exhibits excellent thermal stability (\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>d5%<\/jats:sub>\n                    = 478.3\u00b0C), superior moisture resistance (water uptake of 0.41%), and good mechanical flexibility, rendering it highly suitable for advanced microelectronics.\n                  <\/jats:p>","DOI":"10.1002\/adma.74989","type":"journal-article","created":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T03:00:18Z","timestamp":1789095618000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Dynamic Disentanglement Enables Highly Crystalline Fluorinated Polyimide Films Featuring Superior Dielectric Property and Intrinsic Thermal Conductivity"],"prefix":"10.1002","author":[{"given":"Zhuang","family":"Nie","sequence":"first","affiliation":[{"name":"College of Polymer Science and Engineering State Key Laboratory of Advanced 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