问答题
Plastic is commonly found on : product such as detergent bottles, milk jugs (dairy product bottles )
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First is used to produce artificial silk
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Cellulose is not like real plastic because it becomes haed when heat
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first plastic made in a laboratory
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a chemist name Alexander Parkes developed the first plastic
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recycled pens
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Disadvantage: it will produce gases
In some cases, burning it could release toxic fumes.Also, the manufacturing of plastics often created large quantities of chemical pollutants.
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It decomposes by light
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问答题
Natural rubber wood no longer had a stranglehold on rubber supplies.