Kajian tentang efek-efek termo-mekanik dari main chain liquid crystal elastomer (MCLCE) homeotropik

IDRUS, Hadiyati, Yusril Yusuf, S.Si.,M.Si.,M.Eng.,D.Eng

2010 | Tesis | S2 Ilmu Fisika

Telah dikaji efek-efek termo-mekanik dari main chain liquid crystal elastomer (MCLCE) homeotropik dengan konsentrasi cross-linker 8%, 12%, 14%, dan 16%. Sampel MCLCE homeotropik diamati melalui proses pemanasan dan pendinginan dari suhu 30°C sampai 120°C. Foto sampel diambil setiap kenaikan suhu 1°C dan diukur panjangnya. Efek-efek termo-mekanik MCLCE homeotropik dikaji dari pengukuran perubahan panjang relatif, lamda, shape anisotrophy, delta lamda, ekspansi maksimum, lamda max, dan perubahan volume sampel, (V(T)/V(0)). Pertambahan panjang MCLCE meningkat tajam di sekitar suhu transisi nematik isotropik, TnI. Semakin tinggi konsentrasi cross-linker, semakin besar ekspansi dan shape anisotrophy MCLCE homeotropik. Perubahan volume MCLCE relatif konstan pada fese nematik dan isotropiknya, namim mengalami perubahan tajam di sekitar suhu Tni.

Thermo mechanical effects of homeotropic Main Chain Liquid Crystal Elastomer (MCLCE) with concentration of cross-linkers 8%, 12%, 14%, and 16% has been studied. Homeotropic MCLCE's sample was observed through heating and cooling processes from 30°C up to 120°C. The picture of sample was taken every 1°C and measured. Thermo-mecanical effects of homeotropic MCLCE was studied from the measurement of the relative changes of the length, 2, shape anisotrophy, AX, maximum expansion, 2max, and the volume changes, (V(T)/V(0)). The length of homeotropic MCLCE rises fester significantly around the nematic isotropic transition temperature, Tni. As concentration of cross-linker increase, the expansion and shape anisotrophy of homeotropic MCLCE increase. The volume changes of homeotropic MCLCE relatively constant in nematic and isotropic phase, but have changed significantly around Tni temperature.

Kata Kunci : Main chain liquid crystal elastomers (MCLCE) homeotropik,Efek,efek termo,mekanik