In this article, the factors that affect molecular weight and solubility of polyacrylamide are studied and suitable initiator system is selected. The optimum parameters of copolymerizing process are obtained as follows: the molar proportion of acrylamide and sodium acrylate is 7:3, the monomer concentration is 30%, pH value of solution is 12, the oxidizer (K2S2O8) concentration is 0.1%, the reducing agent (NH2CONH2) concentration is 1%, the chain-transfer agent concentration is 0.4%. The initial reaction temperature is 35℃.

討論了影響聚丙烯酰胺分子量和溶解性能的因素综合性爱网，選取了合適的氧化-還原引發(fā)體系视屏久久，確定了制備超高分子量速溶型部分水解聚丙烯酰胺的優(yōu)化聚合工藝參數(shù)：起始共聚合反應(yīng)溫度為35℃人人草人人草.COM，保持在密閉條件下的共聚合反應(yīng)2.5h后日韩欧美黄色视频一区二区播放，再將聚合反應(yīng)溫度升高到55℃欧美乱强伦视频，繼續(xù)反應(yīng)2h无码三级在线中文字幕，反應(yīng)結(jié)束；反應(yīng)溶液單體總濃度：30％黄片欧美性爱，共聚合反應(yīng)溶液pH值：12美日韩制服中文字幕视频，氧化劑K_2S_2O_8：0.1％，還原劑NH_2CONH_2：1％亚洲国模私拍人体GOGO图片，共聚合反應(yīng)中兩種單體的投料比：丙烯酰胺：丙烯酸鈉=7：3毛片无码大全免费，異丙醇鏈轉(zhuǎn)移劑：0.4％。

Jatropha Curcas oil was used as feedstock for producing biodiesel by transesterification,and adding sodium hydroxide,potassium hydroxide or sodium methoxide as catalyst respectively. The optimal conditions were obtained:molar ratio of methanol to oil 6∶1,reaction temperature 60 ℃,reaction time 80 min,mixing intensity 600 r/min,catalyst concentration for NaOH,KOH,or CH3ONa 1.2% of oil weight,The yield of biodiesel was above 97%. The physico-chemical indices of the biodiesel obtained met the quality standard ASTM of USA and DIN V of Germany.

選用了非食用油麻瘋果油為原料A片免费看视频，以氫氧化鈉www.xx日本黄色视频.com、氫氧化鉀、甲醇鈉為催化劑国产一级a片精品久久，通過酯交換法制取生物柴油日韩欧美女自拍图片大全集高清视频，研究表明最適宜工藝條件為：醇油比6∶1，反應(yīng)溫度60 ℃欧美性爱AAAAA视频，反應(yīng)時間80 min91露脸经典对白，攪拌強度為600 r/min，催化劑用量為1.2%在线中文字幕亚洲日韩精品，轉(zhuǎn)化率達到97%以上A片国产又色在线观看，且生物柴油各項理化指標(biāo)均符合美國和德國測試標(biāo)準(zhǔn)。

Polyester glycols having molecular weight of 600 and 1000 are synthesized on condition that molar excess content of glycol is 14~15%, and high vacuum time is 8h.

制備分子量為2000的聚酯二醇要求醇摩爾過量不高于8％2020国产精品视频观看，高真空時間不低于12h日韩精品欧美视频一区。

The effect of molecular weight, material molar ratio, th e feeding way, water content, solvent was studied respectively.

合成了一系列紫外光固化聚氨酯丙烯酸酯聚合物，研究了分子量欧美性爱在线视频播放、原料配比国内体内she精视频乱码、反應(yīng)方式、含水量中日韩欧美一级高清视频、溶劑等對其流變行為的影響亚洲Aⅴ永久无码天堂。

The effects of temperature, benzene to ethylene molar ratio and the weight hourly space velocity of ethylene on the catalyst performance were studied, respectively.

通過考察反應(yīng)溫度欧美-黄色工厂、苯烯摩爾比和乙烯質(zhì)量空速對催化劑性能的影響，獲得了如下適宜工藝條件：反應(yīng)溫度190～220℃亚洲精品色婷婷在线影院，苯烯摩爾比6～8久久久久久亚洲日韩精品一区区三区，乙烯質(zhì)量空速≤2h-1。

Low molecular N,O-carboxymethyl-chitosans with different degrees of substitution were synthesized under heterogeneous conditions by controlling the reaction temperature,the reaction time and the molar ratio of low molecular weight chitosan to chloroacetic acid.

采用不同反應(yīng)溫度国产人爱视频A片在线观看、反應(yīng)時間和低分子量殼聚糖與氯乙酸摩爾比欧美精品视频专区在线，在非均相反應(yīng)體系中合成了不同取代度的低分子量N，O-羧甲基殼聚糖鲁一鲁在线观看精品视频。

In this study, Cryptomeria japonica was liquefied in phenol with H2SO4 and HCl as a catalyst. The epoxy resin was synthesized from epichlorohydrin and bisphenol A with the molar ratio of 5/1. Blending resins were prepared by mixing the liquefied Japanese cedar and epoxy resin with weight ratios of 30/100, 50/100 and 70/100, and the triethylene tetramine was added as a cross-linking hardener. The effect of mixing ratios of liquefied Japanese cedar to epoxy resin and amount of hardener added on the reactivity of blending resins and the properties of cured resins were investigated. Furthermore, polysiloxane and rice husk were added as foaming agent and filler, respectively, to the epoxy resin and blending resins. The foaming process, the bubbles shape, the mechanical properties, and the thermal stability of the epoxy foams were investigated.

中文摘要本研究將柳杉(Cryptomeria japonica在线黄色视频了,； Japanese cedar)木材以酚為溶劑，H2SO4及HCl為催化劑進行液化處理无码又黄又湿又免费视频下载，另以莫耳比5/1之環(huán)氧氯丙烷與雙酚A反應(yīng)合成環(huán)氧樹脂免費看男女高潮又猛又爽，并將液化柳杉與環(huán)氧樹脂以重量比30/100、50/100及70/100混合制備摻合樹脂欧美一级A一级a爱片牲交高清，并以三乙基四胺(Triethylene tetramine自拍黄网； TETA)為架橋硬化劑，探討液化柳杉與環(huán)氧樹脂混合比及硬化劑添加量對其摻合樹脂之反應(yīng)性久久性AV，及其硬化樹脂性質(zhì)之影響99热这里只有精品最新首页；進一步於環(huán)氧樹脂與摻合樹脂中添加聚矽氧烷為發(fā)泡劑，稻殼粉為填料制備發(fā)泡體午夜精品在线，探討其發(fā)泡體之發(fā)泡過程高清国语自产拍视频在线不卡、泡體形態(tài)、發(fā)泡體機械性質(zhì)與熱穩(wěn)定性亚洲免费黄色三级录像。