UHMWPE

Conjunto de engrenagem produzido com "UHMW"
Estrutura molecular do UHMWPE

UHMW (Ultra high molecular weight polyethylene) é a sigla em inglês para Polietileno de Ultra Alto Peso Molecular.

O peso molecular extremamente elevado proporciona a esse plástico de engenharia, além de excelentes propriedades mecânicas, uma viscosidade tão alta no estado fundido que o índice de fluidez (190oC / 21,6kg) aproxima-se de zero. Destacam-se como principais qualidades a alta resistência ao desgaste por abrasão, a alta resistência ao impacto e o baixo coeficiente de atrito.

Referências

Southern et al., The Properties of Polyethylene Crystallized Under the Orientation and Pressure Effects of a Pressure Capillary Viscometer (1990), John Wiley & Sons, Inc. Journal of Applied Polymer Science vol. 14, pp. 2305-2317 (1970)).

Kanamoto, On Ultra-High Tensile by Drawing Single Crystal Mats of High Molecular Weight Polyethylene, Polymer Journal vol. 15, No. 4, pp. 327-329 (1983)).

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