私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

搜索:  
Intrinsic Self-healing of Covalent Polymers Based on Alkoxyamines Units  
Intrinsic Self-healing of Covalent Polymers Based on Alkoxyamines Units
資料類型: PDF文件
關鍵詞: intrinsic  self-healing  covalent  polymers  alkoxyamines  units  
資料大?。?/td> 110K
所屬學科: 分子表征
來源: 第六屆亞歐研討會上處理和性能增強聚合物會議文集(2013.6.2-6 武漢)
簡介:
Cracksinintrinsicself-mendingpolymerscanbehealedasaresultofcrossoverinterconnectionofreversiblecovalentbondsatthebrokenfaces.Typicalreversiblecovalentbondsservedasbasisforself-healingofstructuralmaterialsareDiels-Alder(DA)interactions[l].Generally,re-mendingofhardsolidmaterialexhibitinggoodmechanicalpropertiesatroomtemperaturehastobeheatedaboveitsTgforfacilitatingmolecularmovementandmass(monomer)transportationtodamagedareas.Thismendingprocesswouldinevitablydistortmaterial‘sshapeasaresultofmolecularcleavageanddrasticallyincreasedeformabilityduetoglasstransition[2].Itisworthnotingthatdistortionofend-useproductsisnotallowedforstructuralapplicationswheremechanicalstrengthpropertiesarecriticalevenifself-healingisproceeding.Tosolvethisproblem,weintroduceanovelhealingmechanismbyemployingalkoxyaminemoietiesasintermolecularlinkstocrosslinkpolystyrene,polyurethaneandepoxy.Uponheatingtocertainhomolysistemperature,covalentC-ONbondfissionandradicalrecombinationsynchronouslytakeplaceamongalkoxyaminemoieties.Crackedpartswerethusreconnectedrepeatedlyinasingle-stepfashion(ratherthanthetwo-steponeinthecaseofDAreaction),withoutlosingintegrityandloadbearingabilityofthematerialevenaboveTg.Moreover,thehealingcanbeconductedwithinawidetemperaturerangebytailoringthespatialandelectroniceffectsofalkoxyaminesunits.Itisfoundthatthespecialdesignedpolymerscanrepeatedlyself-healcrackswithoutdeformationinducedbychainscission,andprovidethepolymerwithmechanicalstabilityatelevatedtemperatureaswell.Molecularstructuresofalkoxyaminesmoieties,aswellasthermodynamicbehaviorofC-ONbondsscissionandrecombination,etc.,arestudiedindetailstooptimizeself-healingbehaviorofthepolymers.
作者: M. Z. Rong, M. Q. Zhang, C. E. Yuan
上傳時間: 2013-06-26 13:32:38
下載次數: 1
消耗積分: 2  
立即下載:
1人
1人
1人
友情提示:下載后對該資源進行評論,即可獎勵2分。
報告錯誤:  1.下載無效  2. 資料明顯無價值  3. 資料重復存在

相關評論 共有0人發表評論 更多評論
你還沒有登錄,無法發表評論,請首先 登錄 注冊
免責聲明:本站部分資源由網友推薦,來自互聯網,版權屬于原版權人,如果不慎侵犯到您的權利,敬請告知,我們會在第一時間撤除。本站中各網友的評論只代表其個人觀點,不代表本站同意其觀點。
主站蜘蛛池模板: 海淀区| 冀州市| 东乡| 剑阁县| 海盐县| 津市市| 墨玉县| 常州市| 古丈县| 曲麻莱县| 南通市| 克山县| 桓台县| 邓州市| 宁远县| 浠水县| 灵宝市| 广丰县| 定陶县| 清远市| 封开县| 洞口县| 海阳市| 淮南市| 休宁县| 游戏| 南靖县| 正蓝旗| 滦平县| 吴忠市| 广元市| 陆川县| 大港区| 辛集市| 万山特区| 宣汉县| 贵溪市| 康平县| 子洲县| 洪江市| 海兴县|