酯化度
- 网络degree of esterification
![酯化度](../cache/1410083.jpg)
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由干柚皮制得的低甲氧基果胶的酯化度为25.1%,胶凝强变为141.7°。
The degree of esterification and gel power of LM-pectin produced from dried pomelo peel were 25.1 % and 141.7 ° respectively .
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红外光谱分析可知大豆油酸加到了蔗糖骨架上,平均酯化度为6.9,酸值为0.38,碘值134.2,相对密度为0.9346。
The IR spectrum indicate that the soybean oleic acid has been added onto the bone of sugar , the the degree of esterification was 6.9 , the acid value was 0.38 , the iodine value was 134.2 , and the relative density was 0.9346 .
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以醇B和醇醚B对MPB进行酯化改性,酯化度为60~100%为好。
For the modification to the MPB through the alcohol B and alcohol ether B esterification , the best esterification degree was 60-100 % .
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本文通过对溶解和熟成初期过程的研究,着重论述了粘胶的胶态稳定性与纤维素黄酸酯的酯化度、溶液中碱的浓度和CS2用量之间的关系。
Thereby the relationships between the colloidal stability of viscose and the ester value of cellulose sulphonate , as well as the alkalinity and the quantity of CS2 used are discussed .
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研究了聚(β-氯乙基缩水甘油醚)的酯化反应动力学,并通过~1HNMR和IR光谱确立了酯化度的计算关系式。
Moreover , the kinetic of esterification of the poly (β - chloroethyl glycidyl ether ) was studied , and the calculation formula of esterification degree by 1H NMR and IR spectroscopy was established .
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考察了PPVA活性分离层的酯化度、分离温度、进料浓度等因素对复合膜的分离性能的影响。
Effects of PPVA activity layer esterification degree , separation temperature and feed EtOH concentration on the PPVA / PAN composite membrane separation properties were all investigated .
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制备不同酯化度果胶的新方法
New method to prepare the pectin having various degrees of methyl - esterification
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不同酯化度的酯基季铵盐阳离子表面活性剂的制备及性能
Synthesis and properties of quaternary ammonium salt cationic surfactant with different esterification degree
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结合酯化度,探讨了交联处理对黏胶纤维的保水率和力学性能的影响。
The water retention rate and the mechanical properties of the crosslinked viscose fibers were discussed .
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研究了在催化剂存在下低酯化度果胶与甲醇进行的甲酯化反应。
The methyl - esterification reaction of low - methoxyl pectin with methylalcohol by the presence of some catalysts was observed .
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本文用概率统计和动力学方法,推导了多元醇的丙烯酸酯酯化度分布函数及其计算公式。
By using probability statistics and dynamics , this paper derived the esterification degree distribution function and its calculation formula for polyol-acrylate reaction .
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只要测定了反应物中羟基的反应程度,就可由该式计算出酯化度分布情况,从而为指导配方设计和反应控制提供了理论依据。
The esterification degree distribution can be calculated based on the reaction degree of the hydroxyl groups in reactants determined to provide a theoretical base for formulation design and reaction control .
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论文通过冲击性能、拉伸强度、弯曲强度以及玻璃化转变温度分析,系统研究了聚醚多元醇分子量、结构和酯化度等对增韧改性的影响。
By analysis the data of impact properties , tensile strength , flexural strength and glass transition temperature , polyether polyols structure and esterification degree of phosphate ester has been systematic studied .
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在最佳参数下制取的低甲氧基果胶,其主要质量指标为胶凝度(USA-SAG法)116级,酯化度36.70%,酰胺度21.05%。
Under this optimum conditions , the main quality indexes of the low-ester pectin were 116 of gel power , 36.70 % of esterification degree and 21.50 % of amide substitution degree .
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活性层酯化度为3.3%及6.2%的复合膜具有良好的稳定性,能够适合于酯化反应耦合渗透汽化过程研究及应用。
Composite membranes with the esterification degree of activity layer being 3.3 % and 6.2 % had well separation properties and stability , they were suit to the studying and application of coupled membrane reactor .
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通过溶解温度和凝固浴温度的调整,可以改善产品的结构形态,并用剩余酯化度的概念解释了二者之间的关系,证明了工艺参数选择的合理性。
Adjustment of the after-solution temperature and the solidification bath temperature may improve the structure and morphology of the product , which can be explained with the concept of residual ester value . This shows that the selected technological parameters are reasonable .
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在适宜的反应条件下,对羟基苯甲酸壳聚糖酯酯化度可达130%、得率80%以上。
Under optimum reaction conditions , esterification degree of para-hydroxybenzoate chitosan ester was 130 % , and yield reached 80 % .