02358nas a2200277   4500008004100000022001400041245012800055210006900183260000900252300001400261490000600275520143600281653002301717653001301740653001801753653002101771653001601792653002801808653002301836100001901859700002101878700001901899700001701918700001601935856012901951       2026                        eng d  a2637-610500aEco-friendly gradient porous poly(3-hydroxybutyrate)/natural fiber aerogels for highly efficient thermo-acoustic insulation0 aEcofriendly gradient porous poly3hydroxybutyratenatural fiber ae  cJUN   a8629-86430 v83 a<p>
	The urgent demand for lightweight thermo-acoustic insulation (TAI) materials in transportation and building infrastructure is constrained by difficulties in synthesis and environmental concerns about nondegradable materials. In this study, a strategy is proposed to create gradient porous, biodegradable, fibrillar aerogels via layer-by-layer casting with poly(3-hydroxybutyrate) (PHB), banana fibers (BF), and cellulose nanofibers (CNFs), followed by unidirectional freezing and freeze-drying. These gradient porous aerogels possess a hierarchical porous structure, ensuring excellent hydrophobicity, mechanical strength, and thermal dimensional stability, and exhibit excellent acoustic insulation performance due to impedance mismatch and pore-neck resonance effects, achieving a noise reduction coefficient (NRC) of 0.60. The gradient-structure-based aerogels also exhibit better thermal insulation performance, with ultralow thermal conductivities as low as 0.03 W/(m &amp; centerdot;K). The flame-retardant properties are significantly enhanced by incorporating Al(OH)3 via a solvent-exchange method, thereby achieving a limiting oxygen index (LOI) of 29.3%. The lightweight, gradient-structure-based, biodegradable aerogels possess excellent thermo-acoustic insulation and flame-retardant properties, thereby offering great promise as sustainable insulation materials for next-generation building infrastructure.</p>
10aacousticinsulation10aaerogels10abiodegradable10aflame retardancy10aHydrophobic10apoly(3-hydroxybutyrate)10aThermal insulation1 aAkhila, N., S.1 aShrishti, S., K.1 aSuresh, Sruthi1 aTorris, Arun1 aGowd, Bhoje  uhttps://library.ncl.res.in/content/eco-friendly-gradient-porous-poly3-hydroxybutyratenatural-fiber-aerogels-highly-efficient