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Time-Salt Superposition In Polyelectrolyte Complexes And Enhanced Mechanical Properties of Three-Dimensional Printed Objects By Core-Shell Structured Thermoplastic Filaments

Jiang, Haowei
http://rave.ohiolink.edu/etdc/view?acc_num=akron1533054312671917

Abstract Details

2018, Master of Science, University of Akron, Polymer Engineering.
This work examines two distinct cases where the mechanical properties are controlled by additives or structure. First, the viscoelastic properties of polymer complexes are examined as a function of salt content as salt provides a route to tune the rheological properties through disruption of the associations of the complex. These salt effects have been proposed to collapse to a master curves for the rheological properties of ionic systems through time-salt superposition (TSS) as an analog to time-temperature superposition. Here we demonstrate differences in the salt (sodium chloride and choline chloride) dependence of branched polyethylenimine-poly(acrylic acid) (BPEI-PAA) containing approximately 50 wt % water using the frequency dependence of G’ and G’’ and extensional measurements for complexes. The shape of the time average modulus ([E(t)]) obtained from constant strain rate extension experiments is applied to study the relaxation behavior in long timescales. However, inconsistent hydration (partially from dehydration during extension) leads to inconsistences in [E(t)], which hinders the ability to firmly draw conclusions about the applicability of TSS in these systems. Three-dimensional (3D) printing has been commonly used for rapid prototyping manufacturing. However, application of 3D printed parts to products has been limited by their inferior mechanical properties due to the printing process. Core-shell structured filaments can overcome the drawback of the weak interfaces in 3D printing, where the shell material enhance the interfacial strength due to their lower solidification temperature than the core materials. In this work, we demonstrate that PC-ABS-polyethylene core-shell filaments can improve the mechanical properties of 3D printed parts as compared to those printed from pure PC-ABS. We compare the influence of HDPE vs LDPE on the properties of the printed part. The impact resistance can be approximately increased to 3 times as that of pure PC-ABS.
Nicole Zacharia (Advisor)
Bryan Vogt (Advisor)
Kevin Cavicchi (Committee Member)
Plastics; Polymers
Time-Salt Superposition, Polyelectrolytes Complexes, 3D Printing, Core-Shell Structured Filaments, Mechanical Properties

Recommended Citations

Citations

  • Jiang, H. (2018). Time-Salt Superposition In Polyelectrolyte Complexes And Enhanced Mechanical Properties of Three-Dimensional Printed Objects By Core-Shell Structured Thermoplastic Filaments [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1533054312671917

    APA Style (7th edition)

  • Jiang, Haowei. Time-Salt Superposition In Polyelectrolyte Complexes And Enhanced Mechanical Properties of Three-Dimensional Printed Objects By Core-Shell Structured Thermoplastic Filaments. 2018. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1533054312671917.

    MLA Style (8th edition)

  • Jiang, Haowei. "Time-Salt Superposition In Polyelectrolyte Complexes And Enhanced Mechanical Properties of Three-Dimensional Printed Objects By Core-Shell Structured Thermoplastic Filaments." Master's thesis, University of Akron, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1533054312671917

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.