logging in or signing up Topic 4 - Plastics mschongkong Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 5019 Category: Education License: All Rights Reserved Like it (2) Dislike it (0) Added: November 06, 2008 This Presentation is Public Favorites: 2 Presentation Description No description available. Comments Posting comment... By: deadmanchest20011 (29 month(s) ago) slamax!!sir hw can i'll b able to dwnload it???? Saving..... Post Reply Close Saving..... Edit Comment Close By: ambot777 (42 month(s) ago) thank you so much. Saving..... Post Reply Close Saving..... Edit Comment Close By: mschongkong (42 month(s) ago) Hi I have made the presentation downloadable for now, Because the presentaion is not from me but from my students, this is the reason it was not available. Saving..... Post Reply Close Saving..... Edit Comment Close By: ambot777 (42 month(s) ago) how can i download this? Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript P l a s t I c s : P l a s t I c s By: Alison Luk Beatrix Lee Sally Campbell Bonds in Plastics : Bonds in Plastics Covalent Bond Atoms share electrons in outer shell Strongest type of bonding Primary bonds in plastics Thermosets and Thermoplastics : Thermosets and Thermoplastics Macromolecules – long chains of molecules Primary bonds – strong forces of attraction Secondary bonds – weak forces of attraction Thermosetting plastic Thermoplastic Elasticity in thermoplastics : Elasticity in thermoplastics Weaker secondary bonds enable elasticity When under load within elastic limit, plastic can return to original form When load exceeds elastic limit, plastic deforms Some plastics also suffer from creep Heating thermosets and thermoplastics : Heating thermosets and thermoplastics Recyclable Properties of Plastics : Properties of Plastics Thermosetting plastic Thermoplastic Stronger More brittle Low tensile elongation Low viscosity (in liquid form) Higher temperature resistance Tougher (more impact strength) Less brittle High tensile elongation High viscosity (when liquid) Polypropene/Polypropylene : Polypropene/Polypropylene Chemical-resistant containers e.g. Food Containers Hinges Fishing nets Medical equipmente.g. syringes Bottle crates Polyethene/Polyethylene : Polyethene/Polyethylene LDPE: Packaging film Carrier bags TV cable Toys Detergent 'squeezy' bottles HDPE: Bottles Pipes Bowls Milk Crates Buckets Polyurethane(can be thermoplastic or thermoset) : Polyurethane(can be thermoplastic or thermoset) Skateboard wheels Varnish Shoe soles Artificial sponges Cushioning & buoys in boat hulls Urea-Formaldehyde : Urea-Formaldehyde Electrical fittings i.e. plugs Textiles i.e. clothing Wood adhesives Slide 11: Disposing Plastics Dumping in Landfills Destroys the environment Non biodegradable Hazardous to wildlife Via Incineration Process Releases harmful toxic fumes into the atmosphere RECYCLE Designated recycling bins Plastic Resin Symbol easily distinguished faster recycling process You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Topic 4 - Plastics mschongkong Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 5019 Category: Education License: All Rights Reserved Like it (2) Dislike it (0) Added: November 06, 2008 This Presentation is Public Favorites: 2 Presentation Description No description available. Comments Posting comment... By: deadmanchest20011 (29 month(s) ago) slamax!!sir hw can i'll b able to dwnload it???? Saving..... Post Reply Close Saving..... Edit Comment Close By: ambot777 (42 month(s) ago) thank you so much. Saving..... Post Reply Close Saving..... Edit Comment Close By: mschongkong (42 month(s) ago) Hi I have made the presentation downloadable for now, Because the presentaion is not from me but from my students, this is the reason it was not available. Saving..... Post Reply Close Saving..... Edit Comment Close By: ambot777 (42 month(s) ago) how can i download this? Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript P l a s t I c s : P l a s t I c s By: Alison Luk Beatrix Lee Sally Campbell Bonds in Plastics : Bonds in Plastics Covalent Bond Atoms share electrons in outer shell Strongest type of bonding Primary bonds in plastics Thermosets and Thermoplastics : Thermosets and Thermoplastics Macromolecules – long chains of molecules Primary bonds – strong forces of attraction Secondary bonds – weak forces of attraction Thermosetting plastic Thermoplastic Elasticity in thermoplastics : Elasticity in thermoplastics Weaker secondary bonds enable elasticity When under load within elastic limit, plastic can return to original form When load exceeds elastic limit, plastic deforms Some plastics also suffer from creep Heating thermosets and thermoplastics : Heating thermosets and thermoplastics Recyclable Properties of Plastics : Properties of Plastics Thermosetting plastic Thermoplastic Stronger More brittle Low tensile elongation Low viscosity (in liquid form) Higher temperature resistance Tougher (more impact strength) Less brittle High tensile elongation High viscosity (when liquid) Polypropene/Polypropylene : Polypropene/Polypropylene Chemical-resistant containers e.g. Food Containers Hinges Fishing nets Medical equipmente.g. syringes Bottle crates Polyethene/Polyethylene : Polyethene/Polyethylene LDPE: Packaging film Carrier bags TV cable Toys Detergent 'squeezy' bottles HDPE: Bottles Pipes Bowls Milk Crates Buckets Polyurethane(can be thermoplastic or thermoset) : Polyurethane(can be thermoplastic or thermoset) Skateboard wheels Varnish Shoe soles Artificial sponges Cushioning & buoys in boat hulls Urea-Formaldehyde : Urea-Formaldehyde Electrical fittings i.e. plugs Textiles i.e. clothing Wood adhesives Slide 11: Disposing Plastics Dumping in Landfills Destroys the environment Non biodegradable Hazardous to wildlife Via Incineration Process Releases harmful toxic fumes into the atmosphere RECYCLE Designated recycling bins Plastic Resin Symbol easily distinguished faster recycling process