![]() 229920002873 Polyethylenimine Polymers 0.000 description 2.239000002131 composite material Substances 0.000 description 6.238000006011 modification reaction Methods 0.000 description 8.239000006098 acoustic absorber Substances 0.000 description 20.239000011358 absorbing material Substances 0.000 description 56. ![]()
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