Flexible and coatable insulating silica aerogel/polyurethane composites via soft segment control
Source abstract
Abstract
Abstract We herein propose a facile approach to fabricate foldable and coatable silica aerogel polyurethane composites (APCs). For the flexibility control, the soft segment of polyurethane (PU) is manipulated. The change in soft segment length induces a difference in overall glass transition temperature of PU. When the silica aerogel content is increased, the PU with a shorter soft segment length shows brittle fracture behavior, while the PU with a longer soft segment length shows no breakage after bending. The thermal insulation properties of APCs were enhanced by 72% reduction in thermal conductivity upon 30 wt% aerogel loading and theoretically verified by a micromechanics-based thermal conductivity model considering the effects of interface and agglomeration. In addition, for the combustion behavior measurements, heat release rate and heat release capacity are substantially reduced for the APCs compared to neat PUs. Those enhanced thermal insulation properties may have a commercial impact on thermal insulation applications.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Aerogels and thermal insulation · Silicone and Siloxane Chemistry · Surface Modification and Superhydrophobicity
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (49)
Show source-provided references
1. Chemistry of aerogels and their applications10.1021/cr0101306 ↗
2. Coherent expanded aerogels and jellies10.1038/127741a0 ↗
3. Isocyanate-crosslinked silica aerogel monoliths: preparation and characterization10.1016/j.jnoncrysol.2004.06.041 ↗
4. An overview on silica aerogels synthesis and different mechanical reinforcing strategies10.1016/j.jnoncrysol.2013.10.017 ↗
5. Supercritical gel drying: a powerful tool for tailoring symmetric porous PVDF−HFP membranes10.1021/am800101a ↗
6. Syndiotactic polystyrene aerogels with β, γ, and ε crystalline phases10.1021/cm802537g ↗
7. Polymer nanoencapsulated rare earth aerogels: chemically complex but stoichiometrically similar core-shell superstructures with skeletal properties of pure compounds10.1039/B612625A ↗
8. Silica aerogel/polyvinyl alcohol (PVA) insulation composites with preserved aerogel pores using interfaces between the superhydrophobic aerogel and hydrophilic PVA solution10.1016/j.compositesa.2015.04.014 ↗
9. Silica aerogel granulate material for thermal insulation and daylighting10.1016/j.solener.2004.08.032 ↗
10. Traditional, state-of-the-art and future thermal building insulation materials and solutions – properties, requirements and possibilities10.1016/j.enbuild.2011.05.015 ↗
11. Aerogels—recent progress in production techniques and novel applications10.1023/A:1008663908431 ↗
12. Modified SiO2 aerogels as acoustic impedance matching layers in ultrasonic devices10.1016/S0022-3093(05)80461-2 ↗
13. Silica sol as a nanoglue: flexible synthesis of composite aerogels10.1126/science.284.5414.622 ↗
14. Aerogel applications10.1016/S0022-3093(98)00135-5 ↗
15. Humidity sensors based on silica nanoparticle aerogel thin films10.1016/j.snb.2004.10.034 ↗
16. Multifunctional, ultra‐flyweight, synergistically assembled carbon aerogels10.1002/adma.201204576 ↗
17. A modified activated carbon aerogel for high-energy storage in electric double layer capacitors10.1016/j.jpowsour.2006.09.014 ↗
18. Nanostructured materials for advanced energy conversion and storage devices10.1038/nmat1368 ↗
19. Use of cellulose-based carbon aerogels as catalyst support for PEM fuel cell electrodes: electrochemical characterization10.1016/j.jpowsour.2006.12.084 ↗
20. Synthesis and properties of alumina aerogels (II)10.1023/A:1010316004794 ↗
21. Loads transfer across static electrical phase interfaces in silica aerogel/polymethyl methacrylate composites10.1016/j.compscitech.2016.12.004 ↗
22. Tailoring mechanical properties of aerogels for aerospace applications10.1021/am200007n ↗
23. Aerogels — highly tenuous solids with fascinating properties10.1016/0022-3093(88)90014-2 ↗
24. Nanoengineering strong silica aerogels10.1021/nl025690e ↗
25. The effects of ambient humidity on the mechanical properties and surface chemistry of hygroscopic silica aerogel10.1016/j.jnoncrysol.2004.06.023 ↗
26. Fabrication of elastic silica-bacterial cellulose composite aerogels with nanoscale interpenetrating network by ultrafast evaporative drying10.1016/j.compscitech.2017.11.004 ↗
27. Applications for silica aerogel products10.1016/S0022-3093(98)00054-4 ↗
28. Flexible, elastic, and superhydrophobic silica-polymer composite aerogels by high internal phase emulsion process10.1016/j.compscitech.2017.04.036 ↗
29. Thermal management in polymer composites: a review of physical and structural parameters10.1002/adem.201800204 ↗
30. Synthesis of mechanically reinforced silica aerogels via surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization10.1039/C4TA05618C ↗
31. Low shrinkage, mechanically strong polyimide hybrid aerogels containing hollow mesoporous silica nanospheres10.1016/j.compscitech.2018.07.021 ↗
32. Flexible silica aerogel composites strengthened with aramid fibers and their thermal behavior10.1016/j.matdes.2016.03.063 ↗
33. Synthesis of flexible aerogel composites reinforced with electrospun nanofibers and microparticles for thermal insulation10.1155/2013/375093 ↗
34. Nanoporous SiO2 grafted aramid fibers with low thermal conductivity10.1016/j.compscitech.2017.04.021 ↗
35. Thermally insulating, fire-retardant, smokeless and flexible polyvinylidene fluoride nanofibers filled with silica aerogels10.1016/j.cej.2018.06.102 ↗
36. Multiscale prediction of thermal conductivity for nanocomposites containing crumpled carbon nanofillers with interfacial characteristics10.1016/j.compscitech.2017.12.011 ↗
37. Effective elastic moduli of two-phase composites containing randomly dispersed spherical inhomogeneities10.1007/BF01180222 ↗
38. Interface effect on thermal conductivity of carbon nanotube composites10.1063/1.1808874 ↗
39. Force-induced redistribution of a chemical equilibrium10.1021/ja106332g ↗
40. Comparison of hydrogen bonding in polydimethylsiloxane and polyether based urethane and urea copolymers10.1016/S0032-3861(99)00245-1 ↗
41. Preparation of monolithic silica aerogel of low thermal conductivity by ambient pressure drying10.1111/j.1551-2916.2007.01671.x ↗
42. The effect of different siloxane chain-extenders on the thermal degradation and stability of segmented polyurethanes10.1016/j.polymdegradstab.2003.10.002 ↗
43. Investigation of morphology, mechanical, dynamic mechanical and thermal behaviour of blends based on ethylene vinyl acetate (EVA) and thermoplastic polyurethane (TPU)10.1039/C4RA07823C ↗
44. The synergy of double cross-linking agents on the properties of styrene butadiene rubber foams10.1038/srep36931 ↗
45. Improving dispersion and barrier properties of polyketone/graphene nanoplatelet composites via noncovalent functionalization using aminopyrene10.1021/acsami.7b10474 ↗
46. Preparation of hyperbranched aromatic polyamide grafted nanoparticles for thermal properties reinforcement of epoxy composites10.1039/c1py00096a ↗
47. A probabilistic micromechanical modeling for electrical properties of nanocomposites with multi-walled carbon nanotube morphology10.1016/j.compositesa.2016.11.009 ↗
48. Halogen-free ultra-high flame retardant polymers through enzyme catalysis10.1039/c2gc16192c ↗
49. Highly efficient flame retardant polyurethane foam with alginate/clay aerogel coating10.1021/acsami.6b11659 ↗