Polylactic acid (PLA) is a linear aliphatic polyester produced by poly-condensation of naturally produced lactic acid or by the catalytic ring opening of the lactide group.
聚乳酸(PLA)是一种线性脂肪族聚酯的聚乳酸中自然产生的或由丙交酯开环缩合催化剂组产生。
The five quinazoline compounds were prepared by using 2 amino 4,5 dimethoxy benzoic acid as original material, which underwent ring closing, halogenation and substitution.
方法：以2氨基4 ，5二甲氧基苯甲酸为原料，分别经过环化、氯代、取代等反应，合成了五种目标化合物。
There are two main methods to synthesis PLA, ring - opening polymerization of lactide and condensation polymerization of lactic acid.
聚乳酸的合成主要有两种方法：丙交酯的开环聚合和乳酸直接缩聚。
Used AgNO3 Standard solution to measure the content of mercapto heterogeneous ring compound and thioureido derivative in acid coppering gloss agent continuously by potentiometric titration.
以硝酸银标准溶液，采用电位滴定法，连续测定酸性镀铜光充剂中的巯基杂环化合物和硫脲衍生物的含量。
The intermediate dye can then undergo an acid catalyzed ring opening to produce a colored dye form.
然后中间体染料可进行酸催化的开环，以产生有色染料形式。
Methods : PGA non woven mesh was put into the mold of trachea cartilage ring and enforced with polylactic acid.
方法：按气管软骨环的形状制备模具，将聚乙醇酸无纺网置于模具中，用聚乳酸塑形；
Polylactic acid synthesis in two major ways:direct polymerization and lactate lactide ring-opening polymerization.
聚乳酸的合成方法主要有两种：乳酸直接聚合和丙交酯开环聚合。
The of polylactic acid(PLA) was obtained by ring-opening polymerization and the synthesis conditions to get 444,848 molecular weight were optimized.
采用间接开环聚合法合成了平均分子量为444 ，848的聚乳酸，并对合成工艺作了优化。
There are two main methods to synthesis PLA, condensation polymerization of lactic acid and ring-opening polymerization of lactide.
聚乳酸的合成主要有两种方法：乳酸直接缩聚和丙交酯的开环聚合。
The application effect of the cascade ring acid resistant ceramic packing is described and it is considered to be more effective than Intalox saddle.
考虑到装置产能扩大，我厂将硫酸干燥塔和吸收塔的矩鞍填料全部改为阶梯环耐酸陶瓷填料，并在实际生产中达到了预期效果。
Bicyclic fused aziridines can generate regioselective ring opening reaction with various alcohols, catalyzed by slight concentrated sulfuric acid.
用醇作溶剂、微量的浓硫酸作催化剂，稠合双环氮杂环丙烷衍生物可发生区域选择性氮杂环开环反应。
An adhesive composition includes a curable resin and a porphyrin derivative, in which the porphyrin derivative has at least one carboxylic acid group that is typically pendant from the porphyrin ring.
粘合剂组合物包括可固化树脂和卟啉衍生物，其中卟啉衍生物具有通常从卟啉环伸出的至少一个羧酸基团。
Thep-benzoquinone was oxidized to open the ring and formed other intermittent products such as butanol, butanone, propanoic acid and ethanediol.
对苯醌开环后，进一步被氧化，中间会生成丁醇、丁酮、丙醇、乙二醇等。
With salicylic acid (sa) as the induced factor, the fruit of Red Fuji apple as the experimental material, the paper studied the resistance induced by sa to apple ring rot.
本论文以水杨酸(SA)为诱导因子，以红富士苹果果实为研究对象，研究SA诱导苹果果实后产生抗轮纹病的机理。
In this paper the electrochemical reduction mechanism of selenious acid(H 2SeO 3) in phosphoric acid solution was studied by rotating ring-disc electrode and cyclic voltammetry techniques.
利用旋转环-盘电极方法开结合循环伏安技术研究了磷酸溶液中亚硒酸的电化学还原机理。
A new type filler, PTFE ladder Rasching ring is designed and used in the washing tower of anhydrous hydrofluoric acid equipment, properties of this filler is also analyzed.
设计了1种新型填料—ptfe阶梯拉西环并应用在无水氢氟酸装置的洗涤塔中，分析了该填料的特性。
In this paper, the polylactic acid is synthesized by two-step method from lactic acid to lactide, then open-ring polymerize to PLA (polylactic acid).
采用二步法由乳酸制备丙交酯，由丙交酯的开环聚合制备高分子量的聚乳酸。
Disclosed is a means for producing lactide efficiently in the production of a poly(lactic acid) by depolymerizing a lactic acid oligomer to produce lactide and ring-opening-polymerizing lactide.
本发明在对乳酸低聚物进行解聚并对得到的丙交酯进行开环聚合的聚乳酸的制造中，提供一种高效地得到丙交酯的方法。
Lactide, which was synthesized through lactic acid condensation, was polymerized to form PLA by ring-opened of lactide.
聚乳酸的制备多采用乳酸脱水生成丙交酯，然后开环聚合成聚乳酸。
I produced the automotive sealing ring, with good compactness, high hardness, low wear, good sealing performance, high temperature, high pressure, acid corrosion.
我公司生产的汽车用密封环，具有致密性好、硬度高、磨耗低、密封性能好、耐高温、耐高压、耐酸碱腐蚀等特点。
I produced the automotive sealing ring, with good compactness, high hardness, low wear, good sealing performance, high temperature, high pressure, acid corrosion.
我公司生产的汽车用密封环，具有致密性好、硬度高、磨耗低、密封性能好、耐高温、耐高压、耐酸碱腐蚀等特点。
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