polyvinyl alcohol (pva) meaning in Chinese
聚乙烯醇
Examples
- The new usage of polyvinyl alcohol ( pva ) in many industrial fields in recent years are presented
摘要介绍了近年来聚乙烯醇产品在各个工业领域中的新用途，说明这种化工原料仍有广泛的使用价值。 - This paper describes the new production and properties of ductile fiber reinforced cementitious composites ( dfrccs ) . this particular dfrcc contains polyvinyl alcohol ( pva ) fibers , employing low fiber volume fractions ( between 1 % and 2 % ) and high - strength and high elasticity modulus
本文采用低掺量(纤维体积率为1 2 )的高强高弹聚乙烯醇纤维(简称pva纤维)进行了延性纤维增强水泥基材料( dfrccs )的研制与性能测定。 - The mechanism for optical storage in these materials has been attributed to a statistical reorientation of the azobenzene chromophors perpendicular to the polarization of the incident electric field of the pump laser beam . the photoinduced birefringence and holographic storage in methyl orange dyes ( mo ) doped polyvinyl alcohol ( pva ) films were reported firstly in this thesis . the relationship between the photoinduced birefringence and the dye content and pumping power was investigated by using the writing light of 532 nm ( double - frequency of nd : yag laser ) and the reading light of 632 . 8 nm
本文研究了甲基橙( mo )偶氮苯染料掺杂聚乙烯醇( pva )薄膜的光致双折射和全息光存储特性，利用yag激光2倍频( 532nm )作为写入光， he ? ne激光( 632 . 8nm )作为读出光，研究含有不同染料浓度pva薄膜的光致双折射特性，探讨了光致双折射和泵浦光功率的关系，实现了全息光存储，所得光栅生长曲线包含快过程和慢过程，快过程以异构相位光栅的生长为主，慢过程以取向光栅的生长为主，对此实验结果本文给出了合理的理论解释。 - The present work indicates the organic nf membranes and the inorganic nf membranes all have shortages , so develop composite nf membranes that have low cost , mechanically strong and thermally / chemically - resistant , easy to cleanout and good performances is a very important task . in this paper , the preparation of inorganic - organic composite nf membranes were presented . this composite comprise a porous sio2 / al2o3 support substrate , the pore diameters of which ranging from 10 to 15 nm , this inorganic support substrate having a polymer membrane which comprises an polyvinyl alcohol ( pva ) or polyamide ( pa ) densely deposited on at least one of the face surfaces thereof , the structural porosity of such pva and pa membrane ranging from 3 to 5 nm
本论文以开发无机?有机复合纳滤膜为出发点，首先在al _ 2o _ 3多孔微滤膜上利用溶胶?凝胶法制备sio _ 2 al _ 2o _ 3无机复合超滤膜作为无机?有机复合纳滤膜的基膜；选用聚乙烯醇和聚酰胺为表面功能层材料，分别探讨了以羟基丁二酸和磺基水杨酸为混合交联剂，采用浸涂法制备了聚乙烯醇sio _ 2 ? al _ 2o _ 3复合纳滤膜；以均苯二甲酰氯、哌嗪和二胺为单体，采用界面聚合法制备了聚酰胺sio _ 2 ? al _ 2o _ 3复合纳滤膜，并对影响膜性能的诸多因素进行系统研究。 - The polyvinyl alcohol ( pva ) in precursor can improve the porosity and make the aperture distribution narrower . so the gels were not easily crazing when drying . simultaneously the fluorescence intensity of the dyes increased as a result of the probabilities of radiationless transitions
在先驱液中加入少量有机聚合物聚乙烯醇1 （ pva ）不仅改善了孔结构，使孔径分布窄，凝胶在干燥过程中不宜开d裂，而且使掺于其中的染料分子的迁移运动受到限制；降低了非辐射i跃迁的几率，提高了染料的荧光强度。