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Petro - Theses: Recent submissions

Now showing items 1061-1080 of 1415

Toughening of polybenzoxazine by silk sericin-g-PLA/Marl biocomposites

Juthamas Mahajaroensiri (Chulalongkorn University, 2009)

Polylactide (PLA) is the most widely known biodegradable polymer in use today. Additionally, natural proteins in silk, sericin, have been increasingly used. This work emphasized the synthesis of a graft copolymer, ...
Dehydroxylation of glycerol to propylene glycol over copper/zinc oxide-based catalyst : effect of catalyst preparation

Issariya Chirddilok (Chulalongkorn University, 2009)

Because of the rapid development of biodiesel production by the transesterification of vegetable oil, large quantities of glycerol are available as a reaction by-product. One of the most attractive routes to convert glycerol ...
From chitosan flakes to chitosan nanospheres: investigation of nanosphere structure and factor related to nanosphere formation and model drug incorporation

Chantiga Choochottiros (Chulalongkorn University, 2009)

Development of chitosan as nanomaterial is proposed by modification of functional group on chitosan chain. Grafting phthalic anhydride and α-caboxylpropyl- ω-methoxy polyethylene glycol (mPEG-COOH) on chitosan exhibits ...
Structure and mechanical property relationship of PCL, its nanocomposites, and its graft copolymer

Buncherd Ngamnawakul (Chulalongkorn University, 2009)

Polycaprolactone (PCL) is a biodegradable polyester that is very tough and has a melting point of around 60°C. PCL becomes soft in warm water and can be shaped; therefore, it is proper for use as a boil and bite mouth ...
Induced magnetic properties to surface-modified mesoporous porous clay heterostructures for sensor application in food packaging

Arunsri Mattayan (Chulalongkorn University, 2009)

Porous clay heterostructures (PCHs) are a recent class of solid porous materials, where their surface areas are higher than those of organoclay. In this work, a PCH surface was modified by Fe ions (Fe²⁺ and Fe³⁺) from ...
Development of polybenzoxazine (PBZ) membranes for ethanol/water separation

Ardia Boonmalert (Chulalongkorn University, 2009)

Fermentation is an attractive process for producing feedstock chemicals from renewable biomass. However, the low concentration of the fermentative products creates cost-intensive product separation. The separation of the ...
Development of wet-spun alginate fibers for wound dressing applications

Anyarat Watthanaphanit (Chulalongkorn University, 2009)

Smart alginatebased wound dressings were successfully developed using the wet spinning process. In order to improve the mechanical properties and include the ability to promote tissue reconstruction of neat alginate fiber, ...
Electrospun fiber mats containing silver nanoparticles with antibacterial activities

Pim-on Rujitanaroj (Chulalongkorn University, 2009)

Silver has a long history as an antimicrobial agent, especially in the treatment of burns. Several products have incorporated silver for use as a topical antibacterial agent, such as silver nitrate, silver sulphadiazine ...
Development of protein delivery scaffolds with a separate drug carrier system for bone tissue regeneration

Parintorn Hariraksapitak (Chulalongkorn University, 2009)

This study aimed to develop new drug delivery scaffolds to be used in tooth socket and investigate fabricating parameters which affect the desired characteristics of scaffold. Scaffolds of hyaluronan-gelatin (HA-Gel) blends ...
Sol-gel processing of polysilatrane

Wissanee Charoenpinijkarn (Chulalongkorn University, 1999)

Silatrane complexes are organosilicon compounds, which can be synthesized directly from the reaction of very inexpensive compounds SiO₂ and trialkanolamine. The complexes contain silicon-nitrogen coordinated bonds in their ...
Removal of emulsified oil from wastewater using froth flotation

Wisakha Phoochinda (Chulalongkorn University, 1999)

Froth flotation is a surfactant-based separation process which is applicable for removing oil from water. Ortho-dichlorobenzene (ODCB) which is commonly used in many industrial applications was used as the oil for studying ...
Synthesis and characterization of vinyl chloride/vinylidene chloride copolymers

Warawan Prasithphol (Chulalongkorn University, 1999)

The synthesis of vinyl chloride (VCM)/vinylidene chloride (VDC) copolymers by free radical polymerization in a suspension system is described. This research is involved with the study of the factors affecting synthesis, ...
Mechanism of the mixed matrix membrane (polyethylene glycol/silicone rubber) separation for polar gases

Valya Serivalsatit (Chulalongkorn University, 1999)

An emerging membrane morphology with future potential is mixed matrix membrane composed of two different materials. In this study, mixed matrix membranes of silicone rubber and polyethylene glycol (PEG) were prepared by ...
Selective reduction of nitric oxide with propene over sol-gel silver supported on alumina catalysts

Tipparat Wamanon (Chulalongkorn University, 1999)

The selective catalytic reduction of NO with propene in the presence of oxygen was studied over silver supported on alumina catalysts. The catalysts were prepared by sol-gel method. In this study the silver loading was ...
Removal of ink from rigid high-density polyethylene surfaces to permit plastic recycling

Swe Swe Min (Chulalongkorn University, 1999)

Recycling of plastics can reduce solid waste disposal and the use of raw materials, often non-renewable materials such as oil and natural gas. Printed plastic containers cannot be effectively recycled unless the inks are ...
Preparation and characterizations of polyaniline films for gas sensor application

Sukjai Kitikiatsophon (Chulalongkorn University, 1999)

Controlling the emission of toxic gases such as nitrogen dioxide (NO₂), sulfur dioxide (SO₂), hydrogen sulfide (H₂S), carbon monoxide (CO) and methane (CH₄) in the environment requires a new gas sensor that has high ...
Effect of electron donor and ethylene content on ziegler-natta catalyst

Sawad Wongprechasawad (Chulalongkorn University, 1999)

The effects of ethylene content and CHMDMS(Cyclohexylmethyldimethoxysilane) on ethylene propylene copolymerization, with MgCl₂₋ supported TiCl₄ catalyst activated by Al(C₂H₅)₃, have been investigated. The intensity of the ...
Volatile organic compound removal via catalytic combustion

Rungrodj Roonprapun (Chulalongkorn University, 1999)

Catalytic combustion of volatile organic compounds (VOCs), present in trace concentrations from effluent streams, is a promising air abatement technology. The oxidation of diethylamine (DEA) has been investigated over three ...
Ethylene polymerization by ziegler-natta and metallocene catalyst systems : morphology study and characterization

Punlop Horharin (Chulalongkorn University, 1999)

Since the discovery of TiCl4/AlEt3 catalyst for olefin polymerization in the early 1950s, many generations of such Ziegler-Natta catalysts have been developed. The most active generation is TiCl4 supported on MgCl2. At the ...
Influence of compatibilizer on morphology and mechanical properties of LLDPE/NR blends produced by blown film and chill roll cast film extrusion

Pornpirom Moteplay (Chulalongkorn University, 1999)

The addition of Natural Rubber (NR) into Linear Low Density Polyethylene (LLDPE) significantly improved processability of LLDPE resins as evidenced by the increase of draw ratio (DR) and blow up ratio (BUR) which directly ...

Now showing items 1061-1080 of 1415

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