chemical between pencil and eraser
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chemical between pencil and eraser
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Enter hardware merchant-turned-chemical engineer Charles Goodyear, who, after several years of work, developed the vulcanization process to cure rubber in 1839. During vulcanization, sulfur is added to rubber and the mixture is heated under pressure to form sulfur cross-links between the rubber's polymer chains.
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Answer:
There was much discussion in the comments to the OP regarding whether erasing a pencil mark is a chemical process or merely a mechanical process, akin to removing an oil spill with high pressure water (my analogy). But I think the answer to "Is it a Van der Waals interaction with intermolecular forces" is clearly yes.
Although the classic "pencil head" eraser generally requires a vigorous rubbing action to rapidly remove a pencil mark, even this can be done in a manner that shows pencil marks that had been bound to the paper via intermolecular forces are transferred to a material having a stronger affinity for the pencil mark than does the paper.
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