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Diapositiva 1

Diapositiva 2

Diapositiva 3

Diapositiva 4

WHAT IS A POLYMER?

• 
• *LONG CHAIN MOLECULES THAT ARE JOINED TOGETHER BY MONOMERS
• *AN ALKANE: POLYMER (C-C)
• *AN ALKENE: MONOMER (C=C)
• WHAT IS THE PROCESS OF ADDITION POLYMERISATION?
• *CATALYST OPENS UP ALKENE'S DOUBLE BOND
• *THE BOND IS THE CONNECTED ONTO OTHER CARBON ATOMS
• *THIS IS CALLED AN ADDITION REACTION BECAUSE ONLY 1 PRODUCT IS MADE
• TWO TYPES OF POLYETHENE:
• *LDPE
• *HDPE

DIFFERENCES BETWEEN HDPE AND LDPE

• HDPE
• *WAXY APPEARANCE
• *USES: PLASTIC BOTTLES, WATER PIPES AND TOYS
• LDPE
• *PACKED TIGHTLY
• *DECREASES DENSITY
• *TENSILE STRENGTH
• *THIN FILM
• *USES: PLASTIC BAGS

THERMOSETTING POLYMERS

• 
• *COVALENT BONDS FORM BETWEEN THEM WHILST HEATED
• *CROSS-LINKDS- HOLDS CHAINS TOGETHER
• *POLYMER- HARD AND RIGID
• *CAN'T MELT
• *MOLECULES CAN'T SLIDE PASSED EACHOTHER

THERMOSOFTENING POLYMERS

• 
• *FLEXIBLE AT ROOM TEMP.
• *MELT WHEN HEATED
• *SOLID WHEN COOLED
• *POLYMER CHAINS ARE JOINED TOGETHER BY WEAK INTERMOLECULAR FORCES
• *HEAT CAUSES THE INTERMOLECULAR FORCES TO BREAK AND CAUSES THE POLYMER TO MELT
• *NATURALLY, WHEN YOU COOL IT, THE INTERMOLECULAR FORCES REJOINS AND IT IS A SOLID AGAIN

NANOTECHNOLOGY

• PROPERTIES:
• -STRONG FORCES OF ATTRACTION
• -SURFACE AREA: VOLUME (LARGE)
• --ANTIBACTERIAL
• -VERY SMALL
• -10(-9)
• -FEW HUNDRED ATOMS MEASURED IN NANOMETRES
• -WITHSTAND PRESSURE
• USES:
• -SPORTS EQUIPMENT
• -SILVER NANOPARTICLES- ABSORB SWEAT
• - GOLF CLUBS
• -SHOES