Malaysian Journal of Analytical Sciences Vol 19 No 2 (2015): 416 – 427

 

 

 

SOLID STATE SELF-HEALING SYSTEM: EFFECTS OF USING IMMISCIBLE HEALING AGENTS

 

(Sistem Swa-pemulihan Keadaan Pepejal: Kesan Menggunakan Agen Pemulihan Tidak Larut)

 

Noor Nabilah Muhamad and Mohd Suzeren Mohd Jamil*

 

School of Chemical Sciences and Food Technology,

Faculty of Science and Technology,

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

 

*Corresponding author: suzeren@ukm.edu.my

 

 

Received: 8 December 2014; Accepted: 14 January 2015

 

 

Abstract

The solid state self-healing system was obtained by employs a thermosetting epoxy resin, into which a thermoplastic is dissolved. The aim of this study is to identify the effect of using immiscible healing agents, which are polyvinyl chloride and polyvinyl alcohol, on solid state self-healing system. Healing was achieved by heating the fractured resins to a specific temperature; above their glass transition temperature (Tg) which obtained from dynamic mechanical analysis (DMA) in order for thermal expansion to occur. The thermal properties and bonding formed in the epoxy resins were characterized by means of Fourier Transform Infrared Spectroscopy (FTIR). Izod impact test was performed in preliminary work. Further work then has been done using compact tension test to demonstrate details self-healing capability of the different specimens. Under compact tension test, it was found that healable resin with PVC has highest healing efficiency followed PVA with 7.4% and 3% of average percentage healing efficiencies respectively. These results are due to the different solubility parameters of the thermoset/network and thermoplastic polymer which led to the phase separation. Morphological studies using microscope optic prove the fracture-healing process and morphological properties of the resins.

 

Keywords: solid state self-healing; healing effieciency; compact tension test; impact test

 

Abstrak

Sistem swa-pemulihan keadaan pepejal disediakan dengan melarutkan polimer termoplastik dalam resin epoksi termoset. Tujuan kajian ini dijalankan adalah untuk mengenalpasti kesan menggunakan agen pemulihan tidak larut, iaitu polivinil klorida dan polivinil alkohol, ke atas sistem swa-pemulihan keadaan pepejal. Pemulihan telah dicapai dengan memanaskan resin yang telah patah atau retak pada suhu spesifik, iaitu di atas suhu peralihan kaca (T_g) yang diperoleh dari analisis mekanikal dinamik (DMA) bagi membolehkan pengembangan terma berlaku. Sifat terma dan ikatan yang terbentuk dalam resin epoksi dicirikan menggunakan Spektroskopi Inframerah Transformasi (FTIR). Ujian impak Izod telah dijalankan dalam kerja permulaan. Ujian tekanan padat telah seterusnya dijalankan bagi mengkaji kebolehan swa-pemulihan specimen yang berbeza dengan lebih terperinci. Hasil daripada ujian tekanan padat, resin pemulihan dengan agen pemulihan PVC menunjukkan keberkesanan pemulihan yang tertinggi diikuti dengan agen pemulihan PVA, dengan masing-masing memiliki purata peratusan keberkesanan pemulihan 7.4% dan 3%. Keadaan ini adalah disebabkan oleh perbezaan parameter kelarutan polimer termoset dan termoplastik yang membawa kepada pemisahan fasa. Pencirian morfologi menggunakan mikroskop optik membuktikan proses patah-pulih dan sifat morfologi resin.  

 

Kata kunci: Swa-pemulihan keadaan pepejal; keberkesanan pemulihan; ujian tekanan padat; ujian impak

 

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