臭氧化法用于α－蒎烯均聚、共聚混合物的分离及其结构表征Ⅰ．聚（α－蒎烯）的臭氧化及其环内双键含量的测定

Studies on the Separation and Structure Characterization by Ozonization of Mixtures of Homopolymer and Copolymer of α-Pinene Ⅰ.Studies on Ozonizations of High Molecular Weight Oligomer of α-Pinene

使用微量臭氧化装置，找到了适用于对较高分子量聚（α－蒎烯）的环内双键进行选择、定量地臭氧化的条件：－１５℃，乙酸异戊酯作溶剂，样品浓度５．０ｇ／Ｌ，氧气流速５．０ｍｌ／ｍｉｎ。测定了来源不同、分子量和结构有差异的３个聚（α－蒎烯）样品的双键含量，所得数值和￣１Ｈ－ＮＭＲ测定的相一致。ＩＲ、￣１Ｈ－ＮＭＲ分析表明，聚（α－蒎烯）所含环内双键完全消失，伴有羰基生成。溶解性和分子量测定表明，臭氧化后样品的极性增大，但分子量无明显变化。

Conditions for selective and quantitative ozonization of the endo-double bond of highmolecular weight oligomer of α-pinene was determined in microozonization apparatus.Thecontent of the endo-double bond of three poly(α-pinene) samples with different molecularweight and structure prepared under different conditions was determined.The results werefound to be in agreement with those determined by ￣1H-NMR. The IR and ￣1H-NMR analysesindicated that the endo-double bond of poly(α-pinene)completely disappeared with simulta-neous formation of carboxyl group. Dissolubility and determination of molecular weightindicated that the polarity of ozonization products increased while the molecular weightremained nearly unchanged.