蜜胺樹脂論文：蜜胺樹脂聚乙二醇三(2-羥乙基)異氰脲酸酯增韌熱解動力學(xué)

1、增韌熱解動力學(xué)【中文摘要】蜜胺泡沫塑料是一種具有阻燃、吸音降噪、隔熱、耐熱穩(wěn)定、衛(wèi)生無毒、后加工性能優(yōu)良的綠色環(huán)保的高性能泡沫塑料。但純蜜胺樹脂是含有剛性三嗪環(huán)結(jié)構(gòu)的三維立體網(wǎng)絡(luò)結(jié)構(gòu)的熱固性高聚物,交聯(lián)密度大，發(fā)泡性能差，制成的泡沫體硬度較大，柔韌性較差,不易拉伸。因此,樹脂韌性的提高，脆性的降低，成為開發(fā)新型發(fā)泡用蜜胺樹脂的重要目標(biāo)。本論文選取聚乙二醇（PEG-200）、三（2-羥乙基）異氰脲酸酯（THEIC）兩種改性劑分別對蜜胺樹脂進(jìn)行增韌改性，以樹脂體系的動力粘度作為改性樹脂的評價指標(biāo)，由正交實驗結(jié)合單因素實驗優(yōu)化改性樹脂的聚合工藝條件（如反應(yīng)物摩爾比、反應(yīng)時間、改性劑添加量、固含量等）

2、；通過紅外光譜、核磁共振碳譜、熱失重對改性樹脂的結(jié)構(gòu)、熱穩(wěn)定性進(jìn)行表征和鑒定，并通過測定改性樹脂的拉伸強度和斷裂伸長率對其韌性進(jìn)行表征；最后對改性樹脂的熱解動力學(xué)進(jìn)行研究，為進(jìn)一步了解發(fā)泡用蜜胺樹脂的耐熱性及其應(yīng)用提供參考價值。實驗得出,PEG改性樹脂的適宜工藝條件為：體系pH值為9.5,n（F）/n（M）為2.8,固含量為75%,反應(yīng)時間為50min,PEG添加量為5%THEIC改性樹脂的適宜工藝條件為：體系pH值為9.5,n（F）/n（M）為2.8,固含量為75%反應(yīng)時間為90min,THEIC添加量為10%PEGTHEIC參與了體系反應(yīng)，成功地植入蜜胺樹脂的分子鏈中,加大了三嗪環(huán)之間的距

3、離，可起到增韌改性的作用，但改性劑加入對樹脂的耐熱性能有一定的降低；當(dāng)PEG添加量為5%,THEIC添加量為10%寸,對應(yīng)的改性樹脂的拉伸強度和斷裂伸長率基本達(dá)到發(fā)泡用樹脂GFDA-7勺要求,進(jìn)一步得出適合發(fā)泡用蜜胺樹脂的適宜工藝條件。得到PEG改性樹脂熱解動力學(xué)方程為：【英文摘要】Melaminefoamisakindofhigh-performaneegreenfoamwithFlame-retardant,acousticnoise,thermalinsulation,heatstable,healthnon-toxic,easypost-processingperformance.Wi

4、delyusedinarchitecturalacoustics,automotive,industrialnoise,industrialinsulation,railtransportation,aerospacenavigation,equipmentinstallationandairconditioningsystems,cleaningsystems,etc.Butpuremelamineresinwasathermosettingpolymer,anditformedacross-linkingnetworkstructureinthreedimensions,arigidity

5、triazineringincludedinthenetworkstructure,thusresultedinthatthemelamineresinhasapoorformingfoamperformanee.Foamformedishardandcrispwithpoormechanicalproperties,lowintensity,smalldeformationcapacity,poortensileandflex.Therefore,improvementoftoughnessanddecreasementofbrittlenesswereanimportantgoalonde

6、velopingnewfoamingmelamineresin.ThemelamineresinwhichwasrespectivelymodifiedwithPEG-200andtri(2-hydroxyethyl)isocyanuratewasstudiedinthispaper.Dynamicviscosityofresinsystemisusedastheevaluationindexofmodifiedresin.Theorthogonalexperimentandsinglefactorexperimentwereusedtoinvestigatethepolymerizingre

7、actionconditionsofmodifiedresin(suchasmaterialratio、reactiontime、amountofmodifier、solidcontent)onthepolymerizationreactionsystem;Structureandthermalstabilityofmodifiedresinwerecharacterizedandidentifiedusinginfraredspectroscopy,nuclearmagneticresonancecarbonspectra,thermalgravimetric;Toughnesswascha

8、racterizedthroughdeterminingthetensilestrengthandfractureelongationofthemodifiedresins,andtheoptimalreactionconditionsofappropriatefoamingmodifiedresinareobtained;Finally,Throughstudyingthepyrolysiskineticsofthemodifiedresin,providerefereneevaluesforfurtherunderstandingtheheatresistaneeandapplicationofthefoamingmelamine.TheresultsindicatethattheappropriateconditionsofPEGmodifiedresinwereasfollows,pHis9.5,n(F)/n(M)=2.8,solidcontentis75%,reactiontimeis50min,theamountofPEGis5%;theappropriateconditionsofTHEICmodifiedresinw