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  1. liu, y., & zhang, j. (2019). polyurethane foams: synthesis, properties and applications. crc press.
  2. zhao, h., wang, x., & chen, l. (2020). ¡°effect of isocyanate structure on the processing tolerance of rigid polyurethane foam.¡± journal of applied polymer science, 137(15), 48654.
  3. technical data sheet ¨C suprasec? 2211.
  4. bikiaris, d. n., & karavelidis, v. (2018). ¡°recent developments in polyurethane foams for thermal insulation.¡± materials today communications, 17, 123-132.
  5. oertel, g. (ed.). (2014). polyurethane handbook (2nd ed.). hanser publishers.

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