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Synthesis of New Dendritic Titanium Catalysts and Catalytic Ethylene Polymerization
ACS Omega ( IF 3.7 ) Pub Date : 2021-01-22 , DOI: 10.1021/acsomega.0c05851 Tianyu Lan 1, 2 , Na Zhang 1 , Liduo Chen 1 , Cuiqin Li 1 , Jun Wang 1
ACS Omega ( IF 3.7 ) Pub Date : 2021-01-22 , DOI: 10.1021/acsomega.0c05851 Tianyu Lan 1, 2 , Na Zhang 1 , Liduo Chen 1 , Cuiqin Li 1 , Jun Wang 1
Affiliation
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The 1.0G dendrimer polyamidoamine (PAMAM), 3,5-dichlorosalicylaldehyde, and TiCl4·2THF were used as synthetic materials, and the dendritic salicylaldehyde imide ligand with substituent hindrance and its titanium catalyst were synthesized by the condensation reaction of Schiff base. The structure of the synthesized products was characterized by infrared spectroscopy, nuclear magnetic resonance hydrogen spectroscopy, ultraviolet spectroscopy, electrospray mass spectrometry, and inductively coupled plasma-mass spectrometry. Activated methylaluminoxane (MAO) was used as a catalyst precursor for ethylene polymerization in the process of ethylene catalytic. The effects of ethylene polymerization were studied in terms of the Al/Ti molar ratio, reaction time, reaction temperature, polymerization pressure, and ligand structure of the catalyst. The results show good catalytic performance (70.48 kg PE/mol Ti·h) for ethylene polymerization because of the existence of ortho substituent hindrance on the salicylaldehyde skeleton. Furthermore, high-temperature gel permeation chromatography (GPC)-IR, differential scanning calorimetry (DSC), and torque rheometer were used to characterize the microstructure, thermal properties, and viscoelastic state of the polyethylene samples obtained. The results showed that the product was ultrahigh-molecular-weight polyethylene.
中文翻译：
新型树枝状钛催化剂的合成及催化乙烯聚合
1.0G树状聚合物聚酰胺（PAMAM），3,5-二氯水杨醛和TiCl 4·以2THF为合成原料，通过席夫碱的缩合反应，合成了具有取代基位阻的树枝状水杨醛酰亚胺配体及其钛催化剂。合成产物的结构通过红外光谱，核磁共振氢谱，紫外光谱，电喷雾质谱和电感耦合等离子体质谱法表征。活化的甲基铝氧烷（MAO）被用作乙烯催化过程中乙烯聚合的催化剂前体。从Al / Ti摩尔比，反应时间，反应温度，聚合压力和催化剂的配体结构方面研究了乙烯聚合的影响。结果显示良好的催化性能（70。水杨醛骨架上邻位取代基的阻碍。此外，高温凝胶渗透色谱（GPC）-IR，差示扫描量热法（DSC）和扭矩流变仪用于表征所得聚乙烯样品的微观结构，热性能和粘弹性状态。结果表明，该产物是超高分子量聚乙烯。
更新日期：2021-02-02
中文翻译：
新型树枝状钛催化剂的合成及催化乙烯聚合
1.0G树状聚合物聚酰胺（PAMAM），3,5-二氯水杨醛和TiCl 4·以2THF为合成原料，通过席夫碱的缩合反应，合成了具有取代基位阻的树枝状水杨醛酰亚胺配体及其钛催化剂。合成产物的结构通过红外光谱，核磁共振氢谱，紫外光谱，电喷雾质谱和电感耦合等离子体质谱法表征。活化的甲基铝氧烷（MAO）被用作乙烯催化过程中乙烯聚合的催化剂前体。从Al / Ti摩尔比，反应时间，反应温度，聚合压力和催化剂的配体结构方面研究了乙烯聚合的影响。结果显示良好的催化性能（70。水杨醛骨架上邻位取代基的阻碍。此外，高温凝胶渗透色谱（GPC）-IR，差示扫描量热法（DSC）和扭矩流变仪用于表征所得聚乙烯样品的微观结构，热性能和粘弹性状态。结果表明，该产物是超高分子量聚乙烯。
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