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生物基不饱和聚酯(UPOEM)具有出色的热稳定性、机械性和耐腐蚀性,广泛应用在包装、医用缝合线和药物封装等领域.其制备的核心反应如下:下列说法不正确的是( )
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高三下学期化学《》真题及答案
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不饱和聚酯树脂的固化过程
不饱和聚酯树脂是由饱和的或不饱和的与饱和的及不饱和的缩聚而成的线性高分子化合物
关于聚酯片基的特点叙述错误的是
收缩性低
熔点高
化学稳定性低
热稳定性好
弹性高
关于聚酯片基特点的叙述错误的是
熔点高
热稳定性好
化学稳定性低
收缩性低
弹性高
下列关于聚酯片基的特点叙述错误的是
弹性高
熔点高
收缩性低
热稳定性好
化学稳定性低
不饱和聚酯是指分子主链上含有的聚酯一般由饱和的与饱和的及不饱和的聚合而成.
简述不饱和聚酯树脂的固化特点
简述不饱和聚酯树脂的特性
不饱和聚酯的原料包括和
不饱和聚酯树脂的单体分别为和
乙烯基酯不饱和聚酯树脂腐蚀材料主要分为胶泥和三类
聚酯片基的特点叙述错误的是
熔点高
热稳定性好
化学稳定性低
收缩性低
弹性高
不饱和聚酯树脂固化中引发产生自由基自由基引发树脂中的不饱和双键形成交联网状结构
添加型阻燃剂可分为有机阻燃剂和无机阻燃剂它们和树脂进行机械混合后赋予树脂一定的阻燃性能主要用于等树脂
聚烯烃、聚氨酯、不饱和聚酯
聚碳酸酯、环氧树脂、不饱和聚酯
聚烯烃、聚氯乙烯、聚苯乙烯
聚氨酯、不饱和聚酯、聚碳酸酯
聚酯漆是不饱和聚酯树脂为主要成膜物质由于不饱和聚酯树脂的干燥速度慢漆膜厚实丰满有较高的光泽度和较好的
关于聚酯片基的特点叙述错误的是
收缩性低
熔点高
化学稳定性低
热稳定性好
弹性高
不饱和聚酯涂料的优点有哪些
不饱和聚酯树脂如何固化
不饱和聚酯胶粘剂是以不饱和聚酯树脂为基料加人和配制而成的溶液胶粘剂
引发剂
改性剂
促进剂
填料
助剂
简述不饱和聚酯的成膜机理
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如图所示关系图其中“——”表示相互反应“→”表示转化关系. 1右图中物质X是 2写出实现转化③的一个反应方程式 3转化⑤中Fe3O4发生反应选填“氧化”或“还原” 4图中实现①—⑤的反应中一定是化合反应的是
Itisreportedthatmanymiddleschoolstudentsarejustnotgettingenoughsleepespeciallyduringtheschoolweek.Theproblemseemstoget1badastheygetolder.Year7studentssleep8.4hoursinaschoolnightandYear9studentsonly6.9hours. It'salsoreportedthatnotgettingenoughsleepcancause2probleminastudent'slife.Manystudentsfall3sleepatschoolorwhiledoingtheirhomeworksoitisnot4surprisethattheygetlowergradesthanthosewhogetenoughsleep.Scientistssuggestninehoursanightformiddleschoolstudents.5thestudentswhofeelunhappyandnervous73%don'tgetenoughsleepatnight. Whyaren'tstudentsgettingenoughsleep?Manystudentshaveoneofthe6followthingsliketelephonetelevisionorcomputerintheirbedrooms. 7usethemonaschoolnightnotonlytakestheirtimeawayfromhomeworkbutalsomakes688difficultforthemtosleep.Asaresultmanystudentscan'tsleepbefore11pmyettheymustgetupearly9gotoschool. Scientistsalsosuggeststudentsshouldnotdoexcitingactivitiesforanhour10bedtime.
下列关于热机和环境保护的说法中正确的是
请运用“守恒”的思想回答下列问题. 古代“银针验毒”的原理是4Ag+2H2S+O22X+2H2O根据化学反应前后推出X的化学式为Ag2S.
按要求回答下列问题. 地壳中含量最多的元素符号是
Theywantpracticetheirhobbiesasmanyastheywant.
如图将线段AB绕点O顺时针旋转90°得到线段A'B'那么A﹣25的对应点A'的坐标是
下图是实验室制取气体时常用的仪器回答下列问题1仪器A的名称是2实验室制取二氧化碳的化学反应方程式是3①组装一套制取二氧化碳气体的装置时若选用了标号为AGHIJO的仪器还应选用所给仪器中的②用上述装置制取CO2检验集气瓶内已经收集满CO2气体的操作是4在实验室里用加热高锰酸钾来制取氧气时除合理选用题中所给仪器外还必须补充的一种玻璃仪器是5选择气体制取装置时要考虑反应物状态和气体的性质.
北方冬天常用水作为工作物质向千家万户供暖用水作为工作物质主要是利用水的
FourBenefitsofWritingbyHand TodayisNationalHandwritingDay!Althoughwedon'twritelikeweusedtoherearefourwayshandwritingisstillhelpful. It'sbetterforlearning. 1That'sbecauseputtinginktopaperstimulates刺激thebrain.Onestudyfrom2010foundthatthebrainareasrelatedtolearninglitupmuchmorewhenkidswereaskedtowritewordslikespaceshipbyhandversusjuststudyingthewordclosely. 2 Manyfamousauthorspreferwritingbyhandtotheuseofatypewriterorcomputer.WriterSusanSontagoncesaidthatshepennedherfirstdrafts草稿beforetypingthemupforeditinglater.Shesaid3A2009studyseemstosupportSontag'spreferenceforwritingbyhandElementaryschoolstudentswhowroteessayswithapennotonlywrotemorethantheirkeyboardtappingfriendsbuttheyalsowrotefasterandinmorecompletesentences. Itwillpreventyoufrombeingdistracted分心. Thecomputerinfrontofyouisreallyadistraction.4In2012scientistsevensuggestedthattakingfiveminutebreakstobrowseTumblrorBuzzFeedcouldmakeyouamoreproductiveworker.Howeverwhenit'stimetoworkonthatessayhaveonlyapenandpaperinfrontofyou. Itkeepsyourbrainsharpasyougetolder. 5AccordingtoTheWallStreetJournalsomephysicianssaythattheactofwritingisgoodexerciseforthosewhowanttokeeptheirmindssharpastheyage. A.Itmakesyouabetterwriter. B.Writingisgoodforyourbrain. C.OfcoursetheInternetisn'tallbad. D.Iliketheslownessofwritingbyhand. E.Trywritingbyhandatleast20minuteseachday. F.Manywritershaveapreferenceforwritingbyhand. G.Oneofthemosteffectivewaystostudyistorewriteyournotesbyhand.
计算×=
下列化学实验操作正确的是
Whydidhehaveanawithhiswifeyesterday?Hiswifewasverysad.
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—What'sthematter?—TheysaidIwasn'tallowedhere.Theydon’tallowinthewaitingroom.A.smoking;tosmoke B.smoke;smokeC.tosmoke;smoking D.smoking;smoking
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—It’sawisetowearthewhitetie.Itmatchesyourshirtwell.—Thankyouverymuch.A.choice B.support C.mixture D.honour
下列实验现象的描述错误的是
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父亲使我牢记努力工作的价值.impress…on
下列实验设计无法达到实验目的的是
—Haveyougettoclasslate?—Notyet.
—Ihearyouhavetoexerciseearlyinthemorning.—Right.It'soneoftheinmyfamily.A.plans B.members C.rules D.suggestions
请回答下列与含碳物质有关的问题 CO和CO2都是碳的氧化物但由于它们的不同导致化学性质不同.要鉴别它们可分别向两瓶气体中滴加
如图抛物线y=ax2+bx+c与x轴交于AB两点与y轴交于C点且A10C03抛物线的对称轴为x=-11求抛物线的解析式2在该抛物线的对称轴上是否存在点M使得M到AC距离之和最小若存在求出点M的坐标若不存在请说明理由3该抛物线在第二象限的图象上是否存在一点P使四边形BOCP的面积最大若存在求出点P的坐标若不存在请说明理由4EF分别在抛物线和x轴上以EFBC为顶点的四边形为平行四边形.
Look!Thereissomething漂浮ontheriver
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