Microcrystalline cellulose (MCC) fillers and sulphate lignin were obtained for hybrid composites with high-density polyethylene and lignin. Cellulose fillers were obtained from wood bleached kraft pulp and cotton fibres. The pulp fibres were treated by the thermocatalytic destruction method and then ground in a ball mill. Treatment conditions were developed for each raw material. MCC powder samples were prepared which contained microparticles of different shape and size. The majority of particles obtained from hardwood and softwood pulps had the size in longitudinal direction of 20-40 micrometers. Cotton MCC revealed fiber fragments with greater length and aspect ratio. Composite samples,which contained polyethylene, 50% of lignin, 20% of MCC and a coupling agent, were produced. At 20% filler content, tensile strength, modulus of elasticity, notched Charpy impact strength and Charpy impact strength of composites with MCC filler from cotton linters increased by 30, 64, 50 and 15%, respectively. Earlier it was found that the rayon filler enhanced the mechanical properties of such composites, especially the impact strength, much more as compared with MCC powder fillers. However, since the high quality rayon fiber fillers are not economically attractive, in many cases the MCC fillers can be used to improve the mechanical properties of composites.

Hybrid composites with microcrystalline cellulose, lignin, and polyethylene

249th National Meeting (2015)

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