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The effect of comonomer styrene on the grafting of maleic anhydride onto cyclized natural rubber 共聚单体苯乙烯对马来酸酐接枝到环化天然橡胶上的影响
Pub Date : 2024-08-09 DOI: 10.24114/jpkim.v16i2.56906
Muhammad Said Siregar, Desi Ardilla, E. Eddiyanto, Asmarasari Nasution
The grafting degree of maleic anhydride onto cyclized natural rubber is generally still low. This is due to the lack of electron density of the maleic anhydride double bond so that its reactivity is low. This research aims to increase the grafting degree by the addition of a styrene comonomer. Grafting of maleic anhydride onto cyclized natural rubber had been performed in an internal mixer 150 oC and 80 rpm in the presence of styrene comonomer. The grafted product was analyzed by Fourier Transform Infra-Red to determine the presence of maleic groups and Differential Scanning Calorimetry and Thermalgravimetric to investigate its thermal properties. Fourier Transform Infra-Red spectra confirmed that the grafted product of maleic anhydride onto Cyclized Natural Rubber formed with absorption at 1700 cm-1, 1850 cm-1 and 700 cm-1. The higher concentration of maleic anhydride reacted the higher of grafting degree of maleic anhydride with the high intensity of absorption at 1700 cm-1 and 1850 cm-1. Differential Scanning Calorimetry spectra showed that the glass transition temperature of maleated Cyclized Natural Rubber products increases, the more comonomer are added the higher the glass transition temperature of the product. Generally, based on the Thermalgravimetric spectra, the thermal properties of grafted product does not change significantly compared to the blank sample.
马来酸酐与环化天然橡胶的接枝度一般仍然较低。这是由于马来酸酐双键缺乏电子密度,因此反应活性较低。本研究旨在通过添加苯乙烯共聚单体来提高接枝度。在苯乙烯单体存在的情况下,马来酸酐在 150 oC、80 rpm 的内混器中接枝到环化天然橡胶上。接枝产物通过傅立叶变换红外光谱分析确定了马来酸基团的存在,并通过差示扫描量热法和热重法测定了其热特性。傅立叶变换红外光谱证实,环化天然橡胶上的马来酸酐接枝产物在 1700 厘米-1、1850 厘米-1 和 700 厘米-1 处有吸收。马来酸酐的反应浓度越高,马来酸酐的接枝度越高,在 1700 cm-1 和 1850 cm-1 处的吸收强度越高。差示扫描量热光谱显示,马来酸化环化天然橡胶产品的玻璃化转变温度升高,加入的共聚单体越多,产品的玻璃化转变温度越高。一般来说,根据热重分析光谱,接枝产品的热特性与空白样品相比变化不大。
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