3. In Plastics, the arrangement of the individual
units may be linear or cross linked
Linear or lightly cross-linked polymers form a
class of plastics called thermoplastics.
Heavy cross-linking plastics are called
thermosetting plastics.

4. EFFECTS OF PLASTICS ON ENVIRONMENT
Climate change
 The effect of plastics on global warming is mixed. Plastics are generally made from
petroleum. If the plastic is incinerated, it increases carbon emissions; if it is placed in a
landfill, it becomes a carbon sink although biodegradable plastics have caused methane
emissions. Due to the lightness of plastic versus glass or metal, plastic may reduce energy
consumption.
For example, packaging beverages in PET plastic rather than glass or metal is estimated to
save 52% in transportation energy.


5. THERMOPLASTIC IS A POLYMER
THAT TURNS INTO A LIQUID
WHEN HEATED AND FREEZES
INTO A VERY GLASSY STATE
WHEN COOLED SUFFICIENTLY.

7.  Virtually any desired color or shape
and many combinations of the
properties of hardness, durability,
elasticity, and resistance to heat,
cold, and acid can be obtained in a
plastic

8. oThey are corrosion resistance.
o They have a Low electrical and thermal
conductivity
o They can be easily formed into complex
shapes
o Wide choice of appearance, colors and
transparencies.

9. DISADVANTAGES OF USING PLASTICS

10. RECYCLING PLASTIC
Thermoplastics
can
be
remolded and reused, and
thermoses plastics can be
ground up and used as filler,
although the purity of the
material tends to degrade with
each reuse cycle. There are
methods by which plastics can
be broken back down to a
feedstock state.
 The greatest challenge to the

common containers like soda
bottles can be sorted from
memory. Typically, the caps for
PETE bottles are made from a
different kind of plastic which
is
not
recyclable,
which
presents additional problems to
the automated sorting process.
Other recyclable materials such
as metals are easier to process
mechanically. However, new

11.  bring your own re-useable shopping bags to the market
 don’t buy bottled water – use a re-useable water bottle when you’re on the go, and if you
do buy soft drinks, look for glass.
 use a re-useable coffee cup – keep cups are great, but there are also ceramic re-useable
coffee cups on the market shaped specifically for barista use.
 buy in bulk and re-package for lunches and snacks. eg. buy blocks of cheese rather than
‘singles’, large bags of sultanas, chips and biscuits rather than ‘snack packs’
 go nude for lunch. many schools now have one day a week that is ‘nude food day’ – make
it a nude food day everyday! there are a number of fantastic children’s lunch box options
around.

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July 22, 2012
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13. If you bring a reusable glass bottle or
aluminium bottle from home and fill it with
tap water(homemade lemonade/ice tea), the
environmental impact is close to zero- and
you save a lot of money too.