Time-dependent properties of graphene nanoplatelets reinforced high-density polyethylene

• The deformation of polymers at constant applied stress is one of their major drawbacks, limiting their use in advanced applications. The study of this property using classical techniques requires extensive testing over long periods of time. It is well known that reinforced polymers show improved behavior over time compared to their neat counterparts. In this study, the effect of adding different amounts of graphene nanoplatelets (GNPs) on the time-dependent properties of high-density polyethylene (HDPE) is investigated using short-term creep tests and load/unload recovery tests. The results are discussed in terms of the test profile and the influence of loading history. Viscoplasticity/viscoelasticity analysis is performed using Zapas model and by comparing creep, creep compliance and pure viscoelasticity curves. The results show that the reinforcement of 15 wt% GNP have the most significant effect on the time-dependent behavior, reducing the strain by more than 50%. The creep compliance curves show that nano-reinforced HDPE behaves nonlinearly viscoelastically even at very low stresses. In addition to demonstrating the effect of nano-reinforcement, the discussion of the results concludes that the influence of loading history can be quite significant and should not be neglected in the design and evaluation of material behavior. © 2021 The Authors.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Kompositmaterial och -teknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Composite Science and Engineering (hsv//eng)

Keyword

graphene and fullerenes

mechanical properties

theory and modeling

thermoplastics

viscosity and viscoelasticity

Aliphatic compounds

Creep

Graphene

Graphene Nanoplatelets

High density polyethylenes

Advanced applications

Classical techniques

Design and evaluations

High density polyethylene(HDPE)

Nano-reinforcements

Reinforced high density polyethylene

Time dependent behavior

Time-dependent properties

Reinforcement

Polymeric Composite Materials

Machine Elements

Publication and Content Type

ref (subject category)

art (subject category)