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      Thermoplastic Overmolding onto Injection-Molded and In Situ Polymerization-Based Polyamides

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      , , *
      Materials
      MDPI
      overmolding, in situ polymerization, polyamide

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          Abstract

          We investigated products manufactured by in situ polymerization, which were reinforced with overmolded ribs. We developed our own mold and prototype product for the project. We used three different materials as preform: a material with a magnesium catalyst, manufactured by in situ polymerization, a Brüggemann AP-NYLON-based in situ polymerization material and an injection-molded PA6 (Durethan B30S, Lanxess GmbH) material. The ribs were formed from the same PA6 material (Durethan B30S, Lanxess GmbH). We examined the effect of the different technological parameters through the pull-off of the overmolded ribs. We measured the effect of melt temperature, holding pressure and holding time, and mold temperature. Considering the individual preforms, we pointed out that monomer migration and binding strength are related, which we concluded from the temperature-dependent mass loss of the materials, measured by thermogravimetric analysis (TGA). Finally, we designed a mold suitable for manufacturing overmolded parts. We designed and built pressure and temperature sensors into the mold to examine and analyze pressures and temperatures around the welding zone of the materials.

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          Most cited references16

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          Polymers and Related Composites via Anionic Ring-Opening Polymerization of Lactams: Recent Developments and Future Trends

          This paper presents a comprehensive overview of polymers and related (nano)composites produced via anionic ring opening polymerization (AROP) of lactams. It was aimed at surveying and showing the important research and development results achieved in this field mostly over the last two decades. This review covers the chemical background of the AROP of lactams, their homopolymers, copolymers, and in situ produced blends. The composites produced by AROP were grouped into nanocomposites, discontinuous fiber, continuous fiber, textile fabric, and self-reinforced composites. The manufacturing techniques were introduced and the most recent developments highlighted. Based on this state-of-art survey some future trends were deduced and as their “driving forces” novel and improved manufacturing techniques identified.
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            Multifunctional glass fiber/polyamide composites with thermal energy storage/release capability

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              Stamp forming of carbon fibre/PA12 composites—A comparison of a reactive impregnation process and a commingled yarn system

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                30 October 2018
                November 2018
                : 11
                : 11
                : 2140
                Affiliations
                Department of Polymer Engineering, Budapest University of Technology and Economics, 1111 Budapest, Hungary; borosr@ 123456pt.bme.hu (R.B.); rajamani@ 123456pt.bme.hu (P.K.R.)
                Author notes
                [* ]Correspondence: kovacs@ 123456pt.bme.hu
                Author information
                https://orcid.org/0000-0002-7391-7085
                Article
                materials-11-02140
                10.3390/ma11112140
                6266369
                30380762
                e1b50cc3-f708-4445-bb86-1ea51c8ba4e9
                © 2018 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 07 October 2018
                : 29 October 2018
                Categories
                Article

                overmolding,in situ polymerization,polyamide
                overmolding, in situ polymerization, polyamide

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