综述了聚乙烯醇缩丁烯醛胶的制备原理和制备方法，并主要讨论了聚乙烯醇缩丁烯醛在国内外的应用进展情况。
This paper summarized to prepare the principle and method of poly(vinyl crotonal), as well as mainly discussed state-of-arts of poly(vinyl crotonal)at home and abroad.
讨论了聚乙烯醇缩甲醛胶、聚醋酸乙烯酯胶、脲醛胶、淀粉胶的改性途径，介绍了各改性产品的配方及其性能比较。
Ways to modify the gels of polyvinyl formal, polyvinyl acetate, urea-formaldehyde and amylum are plesented and formulae and alternate properties of various modified products introduced.
讨论了聚乙烯醇缩甲醛胶、聚醋酸乙烯酯胶、脲醛胶、淀粉胶的改性途径，介绍了各改性产品的配方及其性能比较。
Ways to modify the gels of polyvinyl formal, polyvinyl acetate, urea-formaldehyde and amylum are plesented and formulae and alternate properties of various modified products introduced.
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