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~. UNIVERSITI SAINS MALAYSIA Supplementary Semester Examination Academic Session 2003/04 April 2004 IWK 201W4 - RAW MATERLALS & COATINGS CHEMISTRY [IWK 201E74 - BAHANMENTAH & mML-4 PENGLITUPAN] Duration: 3 hours [Masa: 3 jam] Please check that the examination paper consists of FOUR (4) printed pages before you commence this examination. [Sila pastikan bahawu kertas peperikwan ini mengandung- EMPAT (4) mukasuvat yang bercetak sebelum anda memulakan peperihaun hi.] Answer FIVE questions only. Students are allowed to answer all questions in English - OR Bahasa Malaysia Combinations of both. [Jmab L I M  soalun sahaja. Pelajar dibenarkan menjmab samada dalam Bahasa Inggeris ATA U Bahrnsa Malaysia ATAU kombinasi kedua-dzumya. J . . -2/- - 2 -  PWK 201EJ 1. (a) Discuss the chemical structure and properties of natural rubber. Also, state how natural rubber latex can be used to make adhesive. (a) Bincangkan struktur kimia dan sfat-$at untuk getah asli. Juga, nyatakan bagaimana Iateks getah asli boleh digunakun untuk pembuatan perekat. (50 markah) (b) What do you understand by thermoplastic elastomer ? With the aid of one example of the elastomer, describe its use as an adhesive material. (3) Apakah yang dgahamkan dengan elastomer termoplastik ? Dengan bantuan satu contoh elastomer tersebut, perikan pengpnaannya sebagai bahan perekzt. (50 markah) 2. Write short notes on the following: (a) Tackifier resin (b) Chlorinated rubber (c) Anti-skinning agent Tuliskan nota-nota ringkas untuk beriht: (a) Resin fakiJier (5) Getah terklorin (c) Agen anti-hlit (1 00 markah) . . .3/- - 3 -  VWK 201El 3. Discuss the principles of preparation for alkyd and unsaturated polyester resins. Also, mention the curing systems and applications of the two resins in coating. Bincangkan prinsip penyediaan untuk resin alkid dan resin poliester tak tepu. Juga, sebutkan sistern pemntangan dan pengpnaan &lam pengIitupan untuk kedua-dua resin tersebut. (1 00 rnarkah) 4. (a) Describe the method of making chain extended epoxy resin based on bisphenol-A. (a) Perihn heduh pembuatan resin epoksi terpanjang rantai yang berasaskun bisfenol-A. (50 markah) (b) Mention the relationship between the molar ratio of epichlorohydrin to bisphenol-A and molecular weight of the resulting resin. (3) Sebutkun pertalian di antara nisbah molar epikdorahidrin dengan bisfeno I-A dun berut molekzrl untuk resin terhasil. (25 mark&) (c) Write down the curing reactions of epoxy resins by polyamines. (c) Tuliskan tindak balas pematangan untuk resin epobi dengan poliarnina. (25 markah) . . .4/- -4- [IWK 201Ej 5. (a) Illustrate with chemical equations two reactions of isocyanate groups which are important in coatings technology. What are isocyanurates ? (a) Tunjukkan dengan persamaan kimia, dua tinduk balas kumpulan isosianat yang pent ing dalam teknologi penglitup. Apakah isosianurat ? (40 markah) (b) Describe how thermal curable single pack urethane coating system is produced. Write down the curing reactions. (6) Perikm bagaimana sistem penglitupan uretana pak tunggal termatang terma dihusilh.  Tuliskan tindak balas pematangan. (60 markah) 6 .  (a) What are resoles? Write down the chemical reactions involved during the formation of mononuclear phenol alcohols. (a) Apakah resol? Tuliskan tindak balas kmia yang derlibat semasa pembentukan alkohol fenol mononuklear. (40 markah) (b) Describe how urea formaldehyde resin is produced on a large scale. (3) Perikan bagaimana resin urea formaldehid Hihasilkan dalam skala yang besur. (60 mark&) 000000000 

IWK 201E/4 - RAW MATERLALS & COATINGS CHEMISTRY APR 04.

[IWK 201E/4 – BAHAN MENTAH & KIMIA PENGLITUPAN]

http://eprints.usm.my/4627/1/Document-6559_Version-7125_application-pdf_0.pdf

IWK 201E/4 - RAW MATERLALS & COATINGS CHEMISTRY APR 04. [IWK 201E/4 – BAHAN MENTAH & KIMIA PENGLITUPAN]

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