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[공학]스티렌과 디비닐벤젠의 가교중합

저작시기 2006.09 |등록일 2006.12.31 한글파일한글 (hwp) | 3페이지 | 가격 800원

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Crosslinking Copolymerization of styrene and Divinylbenzene

목차

1. title
2. Date
3. Principle
4. Apparatus & Reagents
5. Procedure
6. Result
7. Description

본문내용

1. title
Crosslinking Copolymerization of Styrene and Divinylbenzene

2. Date
Nov, / 21 / `06

3. Principle
Branched polymers have side chains that are attached to the chain molecule itself. Branching can be caused by impurities or by the presence of monomers that have several reactive groups. Chain polymers composed of monomers with side groups that are part of the monomers, such as polystyrene or polypropylene, are not considered branched polymers. In cross-linked polymers, two or more chains are joined together by side chains. With a small degree of cross-linking, a loose network is obtained that is essentially two dimensional. High degrees of cross-linking result in a tight three-dimensional structure. Cross-linking is usually caused by chemical reactions. An example of a two-dimensional cross-linked structure is vulcanized rubber, in which cross-links are formed by sulfur atoms. Thermosetting plastics are examples of highly cross-linked polymers; their structure is so rigid that when heated they decompose or burn rather than melt.
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