共查询到19条相似文献,搜索用时 62 毫秒
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聚烯烃接枝马来酸酐的反应挤出研究 总被引:6,自引:0,他引:6
研究了聚乙烯(PE),聚丙烯(PP)接枝马来酸酐(MAH)的反应挤出,进行了反应体系的热分析,讨论了引发剂过氧化二异丙苯(DCP)和PE/DCP和PP/DCP体系的影响,以及DCP、MAH和电子给予体(EDA)和LDPE/DCP/MAH和PP/DCP/MAH两种接枝体系的影响。 相似文献
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ABS反应挤出接枝马来酸酐研究 总被引:7,自引:0,他引:7
要反应挤出接枝技术,在ABS上接枝MAH,探讨了ABS性能、MAH用量、引发剂品种和用量对MAH接枝率的影响。并用MAH接枝ABS与PA6制成合金,其性能达到国内外同类产品水平。 相似文献
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松油烯与马来酸酐的Diels-Alder反应的研究 总被引:2,自引:0,他引:2
研究了松油烯与马来酸酐的分子间Diels-Alder环加成反应和松油烯的异构转化行为。使用相对于α-松油烯过量的马来酸酐,相对于α-松油烯而言,在65~70℃二时有大约15%,在100~105℃下有38%,在135~140℃时有69%的松油烯异构转化率。同样在65~70℃和100~105℃温度下,矾土、活性白土、硅胶、离子交换树脂、对甲基苯磺酸催化下,大约有20%~77%的异构转化率。用异核远距离关联(HMBC)等核磁共振测试手法解析了环加成产物的结构,归属了各原子的化学位移。 相似文献
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聚乙烯反应挤出接枝马来酸酐的研究 总被引:1,自引:1,他引:1
以过氧化二异丙苯(DCP)为引发剂,使用反应挤出机研究了不同种类聚乙烯及其共混物接枝马来酸酐的反应规律。实验结果表明:产物的接枝率和熔体流动速率(MFR)变化与聚乙烯的种类有直接关系,接枝性能从优到差的顺序为:LDPE>LLDPE>HDPE;引发剂DCP对LDPE接枝产物的MFR影响显著,对LLDPE次之,对HDPE的MFR几乎没有影响;聚乙烯共混物的接枝性能取决于组成共混物的聚乙烯种类和用量。接枝产物及纯化后样品的红外光谱分析表明,酐基是以化学键连接到聚乙烯分子链上,接枝产物几乎不含游离态的马来酸酐。 相似文献
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利用一端含双键、一端含羟基的二氢月桂烯醇与马来酸酐进行酯化反应得到一种新型的两亲性单体。实验中考察了催化剂用量、反应温度、酸醇比对酯化反应的影响,得到了最佳的单酯化反应条件。实验表明:催化剂的加入利于双酯化;不加催化剂,n(马来酸酐):n(二氢月桂烯醇)=1.05:1.0,温度为110℃下只发生单酯化反应,反应6h后,二氢月桂烯醇马来酸单酯的产率可以达到80%以上。利用红外光谱分析表征了产物的结构,证明合成产物为目标产物。 相似文献
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马来酸酐与十八醇酯化反应研究 总被引:11,自引:0,他引:11
本文以对甲苯磺酸为催化剂,讨论了催化剂用量、反应温度等对马来酸单酯及马来酸酐与十八醇酯化反应的影响,发现当催化剂用量大于1.7g时,反应速率与催化剂用量无关。在本实验反应体系下,测定了各步反应的活化能,验证了反应动力学方程:d〖C〗dt=13575〖A〗〖B〗exp(-1202/T)-61700〖B〗〖C〗exp(-478/T):d〖D〗/dt=61700〖B〗〖C〗exp(-4478/T)。 相似文献
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聚醚与马来酸酐的缩合反应研究 总被引:2,自引:1,他引:2
研究了催化剂量,回流温度、溶剂量对聚醚与马来酸酐缩合反应的影响,反应过程通过测量其出水量和酸值随时间的变化来表征。同时,辅之以FTIR表征,结果表明,不同情况下,其反应机理是不同的,总体而言,是一个酯化与经相互竞争的过程,通过研究确之了生产超稠油乳液破乳剂最佳工艺条件,得到的破乳剂使辽河超稠油脱水可达到<5%。 相似文献
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This paper presented a model study on maleic anhydride (MAH) grafted polypropylene (PP) performed in melt state through ultrasonic
initiation without any chemical initiator and solvent. The structures of PP-g-MAH were characterized by FTIR and 13C NMR and the mechanism were discussed. The graft degree (G) was determined by titration using a solution of organic base tetra-butyl ammonium hydroxide (TBAOH) in ethanol, and the
effects of ultrasonic intensity, MAH concentration and styrene (St) on G and graft efficiency (G
E
) of MAH were investigated. Results showed that MAH was successfully grafted onto the PP chain and the optimum conditions
for grafting were at an ultrasonic intensity of 300 W with a MAH concentration of 25 wt.%, and the maximum G of MAH of 3.34 wt.% was obtained when the molar ratio of St to MAH was 1:1. DSC and XRD were also employed to determine the
thermodynamic performance and crystalline structures of the products. 相似文献
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This study examined the polymerizations of maleic anhydride in solution and in the bulk phase catalyzed by nanocrystalline titania or sodium acetate. Through IR and 1H‐NMR, the monomer and polymer were characterized, and the structure of the polymer was confirmed. Moreover, the polymer molecular weight was measured to be 400–800 in solution and 2000–3000 in the bulk phase. The mechanism of the catalytic polymerization was also investigated. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2868–2874, 2003 相似文献
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介绍顺酐的国内外市场概况,包括生产状况、消费现状及预测,主要生产技术及其研究开发动向。提出了我国顺酐行业今后的发展建议。 相似文献
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一步法顺酐加氢生产丁二酸酐的最佳条件为:加氢压力1~1.6 MPa,反应温度50~100℃,反应时间1~2 h,骨架镍催化剂用量是顺酐用量的4%~6%,搅拌速度300 r/m in,在此条件,丁二酸酐的最高收率可达90%以上。 相似文献
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Peng-fei Song Shuan-jin Wang Min Xiao Feng-guang Du Li-qiang Gan Guo-qing Liu Yue-zhong Meng 《Journal of Polymer Research》2009,16(2):91-97
Poly(propylene carbonate maleate) (PPCMA) was successfully synthesized from carbon dioxide with propylene oxide and maleic
anhydride using supported zinc glutarate as catalyst. The PPCMA can be readily cross-linked using dicumyl peroxide (DCP) as
a cross-linking agent. The gel content, thermal performance and mechanical properties of the cross-linked PPCMA were then
investigated. The results showed that the gel content increased with increasing DCP content and reaction temperature. The
as-prepared PPCMA showed higher glass transition temperature (T
g) and decomposition temperature compared with uncross-linkable poly(propylene carbonate) (PPC). The introduction of small
amount of cross-linkable moiety provides a very effective way to improve the thermal stability and to extend the molecular
weight of PPC, consequently extending its application area. 相似文献