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首页> 外文期刊>Journal of Applied Polymer Science >Optimized Synthesis of Styrenic Tackifying Resins
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Optimized Synthesis of Styrenic Tackifying Resins

机译：苯乙烯增粘树脂的优化合成

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Technical pure styrene monomer was cationically polymerized either alone or with a-metylstyrene to prepare tackifying resins. Anhydrous aluminum chloride dispersed in toluene was used as the catalyst. The polymerization was optimized with emphasis on practical viewpoints, and incremental monomer addition method was used in all the syntheses. Certain parameters affected on the reaction and on the resin characteristics, i.e., starting reaction temperature, catalyst percent, monomer and comonomer concentration, and solvent type were investigated. Post-heating of the resins was briefly studied as well. Number average molecular weight (Mn) and poly- dispersity (pm) of the resins were determined by size-exclusion chromatography. Changes of Mn and pm, as well as the reaction rate and yield versus variation of the mentioned parameters, were basically investigated according to the mechanism of carbocationic polymerization. Finally, the structure of the synthesized resins was confirmed by IR and NMR spectroscopy. A graphical method was proposed to quantify comonomer composition of the copolymeric resins by using of the ratio of aromatic to ! aliphatic protons peak area from the corresponding NMR spectra.
机译：将工业纯苯乙烯单体单独或与α-甲基苯乙烯进行阳离子聚合，以制备增粘树脂。分散在甲苯中的无水氯化铝用作催化剂。着重于实际观点优化了聚合反应，并且在所有合成中均采用了增量单体添加法。研究了影响反应和树脂特性的某些参数，即起始反应温度，催化剂百分数，单体和共聚单体的浓度以及溶剂类型。还简要地研究了树脂的后加热。通过尺寸排阻色谱法测定树脂的数均分子量（Mn）和多分散度（pm）。根据碳阳离子聚合机理，基本研究了Mn和pm的变化，以及反应速率和产率与上述参数变化的关系。最后，通过IR和NMR光谱确认了合成树脂的结构。提出了一种图形化的方法，通过使用芳族比对的比例来量化共聚树脂的共聚单体组成。来自相应NMR谱的脂族质子峰面积。

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