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  
資料大小: 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: 凤台县| 邵阳县| 日喀则市| 固原市| 乌鲁木齐县| 孟州市| 湾仔区| 沁水县| 嘉黎县| 宁晋县| 孙吴县| 沾化县| 凤山县| 琼结县| 孟连| 马鞍山市| 新和县| 赤峰市| 临泉县| 乐平市| 淮阳县| 新余市| 漳平市| 尚志市| 宣汉县| 武冈市| 清流县| 广宗县| 甘洛县| 内乡县| 台州市| 枞阳县| 高碑店市| 探索| 高阳县| 托克逊县| 乡城县| 永和县| 安西县| 韶山市| 突泉县|