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Sains Malaysiana 50(10)(2021): 3003-3014
http://doi.org/10.17576/jsm-2021-5010-14
Hydrogenated Liquid Natural Rubber for Compatibility
Enhancement of Poly(lactic acid) and Natural Rubber
Blends
(Getah Asli Cecair
Terhidrogenasi untuk Peningkatan Keserasian Campuran Poli(asid laktik) dan
Getah Asli)
MOHAMAD SHAHRUL FIZREE IDRIS1, NURFARHANA MOHD MUSTAFFARIZAN1& SITI FAIRUS M. YUSOFF1,2*
1Department of Chemical Sciences, Faculty of
Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi,
Selangor Darul Ehsan, Malaysia 2Polymer Research Center (PORCE), Faculty of
Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi,
Selangor Darul Ehsan, Malaysia
Received: 12 November 2020/Accepted: 23 February 2021
ABSTRACT
Non-catalytic
hydrogenation of liquid natural rubber (LNR) via thermal decomposition of
2,4,6-trimethylbenzenesulfonylhydrazide (MSH) is reported in this study.
Parameter studies of the hydrogenation reaction were performed by utilizing the
combination of response surface methodology and central composite rotatable
design (RSM/CCRD). The effects of each variable and the interaction between two
variables (i.e. the MSH:LNR weight ratio and reaction
time) were studied. Statistical analysis showed that the reaction time had
significantly affected the hydrogenation percentage. A reduced quadratic model
equation with the coefficient of determination (R2) value of 0.9875
was developed. The optimized condition as predicted by the software was
compared with the experimental data, which deviated in only 0.67, hence
indicating that this model was reliable and able to predict the hydrogenation
percentage accurately. Fourier-transform infrared (FTIR) and nuclear magnetic
resonance (NMR) spectroscopies were used to characterize the microstructure of
LNR and hydrogenated liquid natural rubber (HLNR). HLNR was then used as
compatibilizer to improve the miscibility of poly(lactic
acid)/natural rubber blends. With an addition of 4% HLNR, the tensile strength
and impact strength of the blends were slightly improved.
Keywords: Hydrogenation; liquid natural
rubber (LNR); surface optimization; 2,4,6-trimethylbenzenesulfonylhydrazide
(MSH)
ABSTRAK
Penghidrogenan tanpa mangkin getah asli cair (LNR) melalui penguraian terma 2,4,6-trimetilbenzenasulfonilhidrazida (MSH) dilaporkan dalam kajian ini. Kajian parameter tindak balas penghidrogenan dilakukan dengan menggunakan gabungan kaedah rangsangan permukaan dan reka bentuk komposit putaran tengah (RSM/CCRD). Kesan setiap pemboleh ubah dan interaksi antara dua pemboleh ubah (iaitu nisbah berat MSH: LNR dan masa tindak balas) dikaji. Analisis statistik menunjukkan bahawa masa tindak balas telah mempengaruhi peratusan penghidrogenan secara signifikan. Persamaan model kuadratik dengan nilai pekali penentuan (R2) 0.9875 diperoleh. Keadaan yang dioptimumkan seperti yang diramalkan oleh perisian dibandingkan dengan data
uji kaji, yang menyimpang hanya 0.67, sehingga menunjukkan bahawa model ini boleh dipercayai dan dapat meramalkan peratusan penghidrogenan dengan tepat. Spektroskopi inframerah transformasi Fourier (FTIR) dan resonans magnetik nuklear (NMR) digunakan untuk mencirikan struktur mikro LNR dan getah asli cecair terhidrogen (HLNR). HLNR kemudian digunakan sebagai pengserasi untuk meningkatkan keserasian campuran poli(asid laktik)/getah asli. Dengan penambahan HLNR 4%, kekuatan tegangan dan kekuatan hentaman campuran telah meningkat sedikit.
Kata kunci: Getah cecair asli (LNR); penghidrogenan; pengoptimuman permukaan; 2,4,6- trimetilbenzenasulfonilhidrazida (MSH)
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*Pengarang untuk surat-menyurat; email: sitifairus@ukm.edu.my
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