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Alkylated alkali lignin for compatibilizing agents of carbon fiber-reinforced plastics with polypropylene


As an alternative to petroleum-based compatibilizing agents, we developed lignin derivatives for compatibilizing agents of carbon fiber-reinforced plastics that have thermoplasticity. In this study, alkyl chains were introduced into alkali lignin at various ratios to optimize the compatibility of the lignin derivatives with both polypropylene and carbon fiber. The interfacial shear strength between the two materials was improved from 8.2 to 17.2 MPa by mixing with the optimized lignin derivative. The value is comparable to that achieved with a typical petroleum-based compatibilizing agent (18.3 MPa).

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We thank Kaoru Saitoh for assisting with the microbond test. This research was promoted by the COI program “Construction of next-generation infrastructure using innovative materials—Realization of safe and secure society that can coexist with the Earth for centuries” supported by MEXT and JST. This study was also supported in part by the Advanced Low Carbon Technology Research and Development Program of the JST and the Cross-Ministerial Strategic Innovation Promotion Program, also of the JST.

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The authors declare that they have no competing interests.

Correspondence to Kosuke Kuroda or Kenji Takahashi.

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