Polyphthalamide (PPA)glass fiber for 3D-MID technology : effect of weld line formation on structure and property relationship

Name: Supakit Chuaping.

LCSH: Molded interconnect devices.

LCSH: Morphology.

LCSH: Adhesion.

Abstract: In recent years, the growing use of 3D Molded Interconnect Devices (3D-MID) has been in peripheral application. Note that, the stresses as climatic mechanical and chemical are increasing on the MID parts. The injection molded part is one of the key successes for MID technology. However, the suited injection molded part for MID has a lack of investigation. Especially the influence of weld lines on the structure and property relationship of MID part is not yet clearly described. The topic of this research work was to demonstrate the feasibility of a 3D-MID concept using injection molding technique and investigate the effects of weld/meld line types on the morphology, tensile, modulus, flexural strength, adhesive and electrical resistance properties. In order to obtain more understanding of the bonds between polymers, two different polymers based on polyphthalamide (PPA) with the same type and amount of glass fiber content were produced by injection molding at the different processing conditions. A mold was designed in such a way that a weld and meld line can be produced at the different angles by changing an insert inside of the mold. The mechanical properties such as stiffness, tensile strength and flexural strength were determined in tensile and flexural tests, respectively. The dispersion of the glass fiber and types of meld/weld line was inspected in scanning electron microscopy. The results showed in line with the expectation of a reduction on mechanical properties in area where weld/meld lines occurred. The result of tensile test was clearly seen that the weld and meld line showed a considerable influence on mechanical properties. The reduction in tensile strength was approximately 58% according to weld line type, whereas approximately 62% in flexural strength. On the other hand, the effects of the injection time and mold temperature on the tensile strength were marginal. Adhesion behavior of metallic structure and materials‟ mechanical properties (tensile and flexural strength) were highly affected by weld line types including weld and meld lines. Weld line type had the most effect leading to high variation of adhesive strength. Other factors had a slightly effect, included metallized pads‟ position and injection time. For electrical resistance of the circuit lines, weld line types had a great effect. It was always true when comparing meld line and weld line at the same injection times. Despite of effect of materials on the adhesion, it showed more effect on the context of resistance

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Name: Suchart Siengchin

Role: Thesis advisor.

Name: Rapeephun Dangtungee

Role: Thesis advisor.

Created: 2014

Modified: 2021-02-22

Issued: 2021-02-22

วิทยานิพนธ์/Thesis

application/pdf

eng

DegreeName: Master of science

Level: Master's Degree

Descipline: Materials and Production Engineering (International Program)

Grantor: King Mongkut's University of Technology North Bangkok

©copyrights King Mongkut's University of Technology North Bangkok

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