polyvinyl alcohol (pva) 中文意思是什麼

polyvinyl alcohol (pva) 解釋
聚乙烯醇
  • polyvinyl : n. ,adj. 聚乙烯化合物[基]（的）。 polyvinyl alcohol 聚乙烯醇。 polyvinyl chloride 聚氯乙烯。 polyvinyl resin 聚乙烯（基類）樹脂。
  • alcohol : n. 1. 【化學】醇；乙醇，酒精。2. 含酒精飲料。
  • pva : 1. polyvinyl acetate 聚醋酸乙烯酯。2. polyvinyl alcohol 聚乙烯醇。
  1. 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

    本論文以開發無機?有機復合納濾膜為出發點，首先在al _ 2o _ 3多孔微濾膜上利用溶膠?凝膠法制備sio _ 2 al _ 2o _ 3無機復合超濾膜作為無機?有機復合納濾膜的基膜；選用聚乙烯醇和聚酰胺為表面功能層材料，分別探討了以羥基丁二酸和磺基水楊酸為混合交聯劑，採用浸塗法制備了聚乙烯醇sio _ 2 ? al _ 2o _ 3復合納濾膜；以均苯二甲酰氯、哌嗪和二胺為單體，採用界面聚合法制備了聚酰胺sio _ 2 ? al _ 2o _ 3復合納濾膜，並對影響膜性能的諸多因素進行系統研究。
  2. A comparison of pcp ( pentachlorophenol ) degradation was made in micro - aeration and anaerobic conditions with three series of batch experiments : ( 1 ) anaerobic granular sludge and the mixed isolated aerobic bacteria were co - immobilized with pva ( polyvinyl alcohol ) and sodium alginate by means of freeze ; ( 2 ) isolated aerobic bacteria were first immobilized with pva and sodium alginate and then mixed with anaerobic granular sludge ; and ( 3 ) isolated aerobic bacteria were directly added in anaerobic granular sludge

    摘要將氯酚優勢好氧菌與厭氧顆粒污泥以三種不同方式組合： （ 1 ）以聚乙烯醇和海藻酸鈉為載體，採用冷凍法將氯酚優勢好氧菌和厭氧顆粒污泥進行混合固定； （ 2 ）將氯酚優勢好氧菌單獨固定后再與厭氧顆粒污泥混合； （ 3 ）將氯酚優勢好氧菌直接投加到厭氧顆粒污泥。
  3. The polyvinyl alcohol cut fiber with high tenacity and high modulus is a new product produced with advanced technology after transforming and expanding the dquipment based on the original production process for the vinylon fiber. the pva cut fiber has high tenaity and modulus, strong resistance to chemicals, especially the resistance to alkai and it also has good resistance to weathering

    高強高模聚乙烯醇纖維fwb是我公司在原維尼綸纖維生產工藝上通過對設備改造和擴建，應用高新技術生產出的產品，使纖維具有強度高，模量高，耐化學藥品性特別是耐堿性，耐候性良好。
  4. Pva polyvinyl alcohol is a kind of water soluble polymer with stable chemical property, good dissolution and strong

    聚乙烯醇是一種水溶性高分子聚合物，它具有化學性能穩定溶解性能良好粘著力大等優點，可用作聚合反
  5. Pva polyvinyl alcohol is a kind of water soluble polymer with stable chemical property, good dissolution and strong a.

    聚乙烯醇pva是一種水溶性高分子聚合物，它具有化學性能穩定溶解性能良好粘著力大等優點，可用作聚合反應? .
  6. 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

    在先驅液中加入少量有機聚合物聚乙烯醇1 （ pva ）不僅改善了孔結構，使孔徑分佈窄，凝膠在乾燥過程中不宜開d裂，而且使摻于其中的染料分子的遷移運動受到限制；降低了非輻射i躍遷的幾率，提高了染料的熒光強度。
  7. The new usage of polyvinyl alcohol ( pva ) in many industrial fields in recent years are presented

    摘要介紹了近年來聚乙烯醇產品在各個工業領域中的新用途，說明這種化工原料仍有廣泛的使用價值。
  8. 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 ）偶氮苯染料摻雜聚乙烯醇（ pva ）薄膜的光致雙折射和全息光存儲特性，利用yag激光2倍頻（ 532nm ）作為寫入光， he ? ne激光（ 632 . 8nm ）作為讀出光，研究含有不同染料濃度pva薄膜的光致雙折射特性，探討了光致雙折射和泵浦光功率的關系，實現了全息光存儲，所得光柵生長曲線包含快過程和慢過程，快過程以異構相位光柵的生長為主，慢過程以取向光柵的生長為主，對此實驗結果本文給出了合理的理論解釋。
  9. 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

    本文採用低摻量（纖維體積率為1 2 ）的高強高彈聚乙烯醇纖維（簡稱pva纖維）進行了延性纖維增強水泥基材料（ dfrccs ）的研製與性能測定。
  10. The influence of retarder on the seaing time and ultimate strength of gypsum plaster was investigated in this paper. the experimental results indicate that the effect of single retarder, such as citric acid, is inferior to that of composite retarder which was made of blending citric acid with a few portland cement ( about 0. 5 ?, by weight ). the effect of different water - retention agents, such as polyvinyl alcohol ( pva ), carboxymethyl cellulose ( cmc ), and na - bentonite, etc., was also studied, and the results demonstrate that by means of adding organic and inorganic water - retention agent simultaneously the water - retention of plastering slurry can obviously be improved. the optimal mix proportion of gypsum plaster suitable to finish coat of walls and ceilings of buildings has been got by use of factorial experiment with orthogonal array accounting for interactions between factors each other

    研究了分別以檸檬酸、檸檬酸與普通硅酸鹽水泥復合物作緩凝劑，調節粉刷石膏的凝結時間，並對比2種緩凝體系對石膏抗折、抗壓強度的影響.比較不同保水劑（聚乙烯醇、羧甲基纖維素）以及相同量的保水劑在不同工藝流程下保水效果上的區別.探索了有機保水劑和無機保水劑對粉刷石膏的保水性的影響.結果表明，檸檬酸與普通硅酸鹽水泥的復合緩凝劑比單純的檸檬酸更能有效地延緩建築石膏的凝結，同時建築石膏的抗折、抗壓強度降低幅度減小
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