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LINIVERSITI SAINS MALAYSIAFirst Semester ExaminationAcademic Session 2003104September/October 2003IWK 3O5E - ADVANCED TECH. OF BIO.RESOURCEaTILIZATION, PAPER & COATINGTime: 2 hoursPlease check that the examination paper consists of FOUR printed pages before youcommence this examination.Answer FOUR questions only. Students are allowed to answer all questions in EnglishOR Bahasa Malaysia OR combination of both.199I.l.lrwK 30sEl-2 -(a) Draw the Jablonsky diagram and illustrate the various transitions that occurwhen a photoinitiator absorbs actinic radiation.(a) Lukiskan gambarajah Jablonsly dan tunjukkan berbagai peralihan yangb erl aku ap ab ila suatu fotopemula menyerap panc aran aktinik.(50 markah)(b) The domain of wavelength generally employed in UV/visible light curing lies inthe range between 200 nm and 700 nm. Calculate the corresponding energies inkJ/Einstein.(b) Panjang gelombang domain yang biasanya digunakan dalam pematangancahaya uv/tanpak terletak dalam julat di antara 200 nm dan 700 nm.Hitun gkan tenaga yang terlib at dal am H/Einste in.(50 markah)2. (a) Describe how an a-amino alkyl phenone photoinitiator undergoesNonish Type I dissociation. Mention which of the photolytic products caninitiate polymerization. Write down other parallel reactions among thephotolytic products.2' (a) Hurailcan bagaimana suatu fotopemula a- amino alkil fenon mengalamipenguraian Norrish Jenis I. Sebutkan produk fotolitik yang manakah yangboleh memulakan pempolimeran. Tuliskan tindak balas selari yang lain diant ara pro duk-pro duk fo t olitik.(50 markah)200...3/-p,)lrwK 30sEI-3-(b) Write short notes on TWO of the following:i) The stability of emulsion coating systems.ii) Multiplicity and orbital designations of ground and excited states.iii) Room Temperature vulcanizable Silicone elastomers.@ Tuliskan nota ringkas terhadap DUA daripada yang berikut:, Kestobilan sistem penglitup emulsi.ii) Multiplisiti dan designasi orbital bagi keadaan bumi dan peadaan teruja.iii) Elastomer silikone tervulkan suhu bilik.(50 markah)3- (a) Describe the method of preparing any oNE of the followine:i) Urethane acrylates.ii) Propoxylated trimethylol propane triacrylate.3. (a) Huraiknn kaedah bagi penyediaan sATU daripadayang berikut:i) Alvilat uretana.ii) Trimetilol propana trialcrilat terpropoksilat.(40 markah)(b) Describe how radiation curable silicone release coatings can be produced andcured by WEB radiation.(b) Huraikan bagaimana penglitup pelepasan silil<one rcrmatang pancaran botehdihasil dan dimatangkan dengan pancarqn UV/EB .(60 markah)tfFI 201...4/-lrwK 30sEl-4-4. (a) Describe with a diagram an Electron Beam processor indicating the essentialfeatures.4. (a) Huraikan dengan menggunakan gambarajah suatu pemproses Bim Elehrondisertai dengan ciri-ciri penting.(50 markah)(b) Illustrate with a diagram the construction of a medium pressure mercury lampemployed for the curing of surface coatings.(b) Tunjukkan dengan menggunaknn gambarajah binaan suatu lampu merlcuribertekanan sederhana yang digunakan bagi pematangan penglituppermukaan.(50 markah)5. (a) Discuss briefly the toxicity and irritancy of acrylic monomers employed inUV/EB curable coatings formulations.i. (a) Bincangkan dengan ringkas kztoksikan dan kzgatalan monomer alvilik yangdi gunakan dal am formul asi penglitup termat ang W E B.(50 markah)(b) Describe an actinometric method of dosimetry of UV radiation.@ Huraikan suatu lcaedah aktinometrik bagi pendosan pancaran W.(50 markah)ooo000ooo1I{\202

IWK 305E - ADVANCED TECH. OF BIO-RESOURCE UTILIZATION PAPER & COATING SEPT-OKT 03.

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IWK 305E - ADVANCED TECH. OF BIO-RESOURCE UTILIZATION PAPER & COATING SEPT-OKT 03.

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