H 2 O 2 -Na 2 WO 4体系在相转移催化下通过不饱和(甲基)丙烯酸酯的选择性环氧化合成环氧(甲基)丙烯酸酯。
摘要:
研究了各种经典的环氧化剂对不饱和(甲基)丙烯酸酯的选择性环氧化。结果表明,在相转移催化下,通过使用H 2 O 2(20%)-Na 2 WO 4体系可以得到高选择性和高收率。在这些条件下,严格控制温度和初始pH值可防止在这些选择性环氧化过程中发生聚合。结果表明,环氧化的选择性取决于两个双键亲核性的差异。
A styrenic copolymer having at least one structural unit represented by general formula (I) and either a structural unit represented by general formula (II) or a structural unit represented by general formula (IX), the content of the unit (II) or the unit (IX) being 0.01 to 99.9 mole %. In these formulae each symbol is as defined in the specification. This copolymer is highly syndiotactic in the stereoregularity of the chain composed of the structural units (I) and is excellent in the adhesion and compatibility with other resins.
Polymeric surface having reduced biomolecule adhesion to thermoplastic articles of such substrate
申请人:SIO2 MEDICAL PRODUCTS, INC.
公开号:US11248100B2
公开(公告)日:2022-02-15
A substrate is described having a treated contact surface comprising a carbon or silicon compound comprising from 1 to 30 atomic percent oxygen, from 0.1 to 30 atomic percent nitrogen, or both, each as measured by XPS. The treated contact surface has a biomolecule recovery percentage greater than the biomolecule recovery percentage of the surface before treatment according to the method.