Studi Properti Poly (L- lactic Acid) (PLLA) : Efek Penambahan Jenis Plasticizer

Amalia Widiasih, Dian and Mayangsari, Siska (2018) Studi Properti Poly (L- lactic Acid) (PLLA) : Efek Penambahan Jenis Plasticizer. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Poly(L-Lactic Acid) PLLA menjadi material pilihan pada aplikasi biomedik karena memenuhi sifat dasar yang dibutuhkan seperti biokompatibilitas, kekuatan mekanik dan mudah diproses, namun tingkat hidrofobnya rendah dan stabilitas thermal yang rendah. Dalam upaya meningkatkan sifat mekanik dan sifat thermal PLLA dilakukan dengan metode solvent blending. Modifikasi PLLA dengan plasticizer sebagai sarana untuk menurunkan Tg dan meningkatkan keelastisan dan kelunakan PLLA. Plasticizer yang digunakan adalah PEG200, PEG400 dan gliserol. Penelitian ini dilakukan untuk mempelajari pengaruh perubahan plasticizer konten terhadap properti PLLA sehingga diketahui konsentrasi dan jenis plasticizer yang paling tepat untuk menghasilkan film dengan properti yang unggul, mempelajari pengaruh berat molekul plasticizer terhadap properti PLLA, serta mempelajari pengaruh modifikasi PLLA dengan MA ke properti PLLA dan campuran PLLA/plasticizer. Metode penelitian yang digunakan dibagi menjadi dua tahap, tahap pertama adalah pembuatan film dari PLLA/Plazticizer, mencampur PLLA dan plasticizer dengan kloroform sebagai pelarut. Memanaskan dan mengaduk campuran tersebut pada suhu 60oC dan kecepatan 200 rpm selama 6 jam menggunakan hotplate. Selanjutnya pencetakan film pada petry dish dan melakukan uji karakteristik hasil pencampuran PLLA/Plasticizer. Untuk tahap kedua adalah tahap pembuatan film dari PLLA-g-MA/Plasticizer, membuat kopolimer PLLA-g-MA dengan teknik grafting. Selanjutnya membuat Film PLLA-g-MA/Plasticizer dengan melarutkan PLLA-g-MA dan plasticizer dengan kloroform kemudian dipanaskan dan diaduk pada suhu 60°C dan kecepatan 200 rpm selama 6 jam menggunakan hotplate. Selanjutnya proses pencetakan film pada petry dish dan dilakukan uji FTIR, DMA, SEM XRD dan DSC. Dari hasil FTIR diketahui bahwa terjadi interaksi antara PLLA dan Plasticizer. Berdasarkan hasil analisa DSC pada penambahan plasticizer menurunkan nilai Tg dan Tm dari PLLA murni, nilai Tg pada campuran PLLA-g-MA relatif lebih rendah dibanding PLLA tanpa modifikasi MA. Berdasarkan analisa XRD terjadi kenaikan derajat kristalinitas seiring dengan banyaknya jumlah plasticizer yang ditambahkan, derajat kristalinitas tertinggi adalah film PLLA/PEG200 sebear 42,544% dan PLLA-g- MA/PEG200 sebesar 45,66%. Berdasarkan hasil analisa SEM PLLA-g-MA/Plasticizer terlihat Plasticizer terdispersi lebih besar dan lebih baik dibandingkan film PLLA/Plasticizer. Dari penelitian didapatkan hasil bahwa semakin banyak penambahan plasticizer, tensile strength dan modulus young semakin rendah tetapi elongation at break mengalami kenaikan. Nilai optimum pada film PLLA/Plasticizer dengan elongation at break tertinggi adalah film PLLA/PEG200 sebesar 2,29% dan PLLA-g- MA/PEG200 sebesar 2,39%. ========== Poly(L - Lactic Acid) PLLA has become a “material of choice” in the biomedical application for its ability to fulfill complex needs that typically include properties such as biocompatibility, mechanical strength and processability but low hydrophobic level and low thermal stability. To modify mechanical and thermal property of PLLA using solvent blending method with chloroform as a plasticizer. PLLA modification with plasticizer was done decrease Tg and increase elasticity and softness of PLLA. The plasticize r used in this study were PEG 200, PEG 400 and glycerol. This research was conducted to study the effect of plasticizer content on PLLA properties to obtain the most appropriate concentration and type of plasticizer to produce the film with better properties, the influence of plasticizer molecule weight on PLLA properties. Investigated and observed the effect of PLLA modification with MA on PLLA properties and blend of PLLA/plasticizer. The research method was in this research was divided into two stages, t he first stage is the synthesis of film from PLLA/Plasticizer by using chloroform as the solvent. Heated and stirred the mixture at 60°C and 200 rpm for 6 hours using the hotplate. The processed of printing films on petry dish and test the characteristics of mixing results PLLA/Plasticizer. For the second stage is the filming stage of PLLA-g-MA/Plasticizer, first making PLLA-g-MA copolymer with grafting technique. Making of film from PLLA -g-MA/Plasticizer by using chloroform as the solvent. Heated and stirred the mixture at 60°C and 200 rpm for 6 hours using a hotplate. The process of printing films on petry dish and test the characteristics of mixing results PLLA-g-MA/Plasticizer. The obtained films were characterized using FTIR, DMA, SEM,XRD, and DSC. From the research, FTIR analysis indicated that it was an interaction between PLLA and plasticizer. Based on the results of DSC analysis, the addition of plasticizer reduced the value of Tg and Tm after pristine PLLA, the Tg value of PLLA-g-MA/Plasticizer was relatively lower than that of the PLLA/ Plasticizer without MA modification. Based on the XRD analysis, the degree of crystallinity increased with the number of plasticizers added, the highest crystallinity was 42,544% the PLLA/PEG200 film and 45,66% for t he PLLA-g-MA/PEG200 film. Based on the result of SEM analysis, the plasticizer was dispersed better in PLLA -g-MA matrix than in PLLA matrix without MA modification. Based on DMA analysis, it was found that more plasticizer will decrease the tensile strengt h and young modulus, but increased the elongation at break. The optimum value of elongation at break was 2,29% and 2,39% for the PLLA/PEG200 and PLLA-g-MA/PEG200 film.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: PLLA; Plasticizer; Film; Solvent Blending; Grafting
Subjects: Q Science > Q Science (General)
T Technology > TP Chemical technology
T Technology > TP Chemical technology > TP1140 Polymers
Divisions: Faculty of Industrial Technology > Chemical Engineering > (S1) Undergraduate Theses
Depositing User: Dian Amalia Widiasih
Date Deposited: 22 Jan 2018 08:25
Last Modified: 22 Jan 2018 08:25
URI: http://repository.its.ac.id/id/eprint/49970

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