Thecharacterizationoftheinterfaceandinterphasestructureofadimethoxysilyl-terminatedpolypropyleneoxide(DMSi-PPO)/diglycidyletherofbisphenolA(DGEBA)system,whichhasaphasestructureofDGEBAparticlesinaDMSi-PPOmatrix,wereinvestigatedbyusingmodeljointswithseveralsubstrates.Thesurfacefreeenergy(r)oftheDMSi-PPO/DGEBAsystemhadvariedwiththe7ofeachsubstrate.Whenthesystemcontactedtohighsurfacefreeenergymaterialsuchaspolyvinylalcohol(PVA)andPEswithUVirradiationfor5andlOminutes(PEuv5,PEuvlO),the7ofthesystemshowedabout42.9-48.9mJ/nrsincetheconcentrationoftheDGEBAasahigh7componentincreasedatadhesioninterface.ItwasshownthatthisDGEBAinclinationoninterfacesjointedtohigh7substratesresultedintheDGEBAconccntrationgradienttoward0､,48/zmdepthofthecuredsystem.Ontheotherhand,whenthesystemcontactedtolowsurfacefreeenergymaterialsuchaspolytetrafluoroethylene(PTFE),polypropylene(PP)andpolyethylene(PE),the7ofthesystemshowedabout24.2-31..6mJ/nrsincetheconcentrationoftheDMSi-PPOincreasedatadhesioninterfaceasalow7component.ItwasalsoshownthatthisDMSi-PPOinclinationoninterfacesjointedtolow7substratesresultedintheDGEBAconcentrationgradienttoward0.24/zmdepthofthecuredsystem.ThesedifferencesinthisDGEBA/DMSi-PPOrationearsurfacesaffectedtothesephaseseparationstructurescomparedwiththebulkstructure.

View full abstract

Recently, Lignophenol has been obtained from Lignin contained in wood-sources, and now the establishment of the use of Lignophenol as industrial materials has been required. If the use of Lignophenol has been developed, new recycle process of wood-sources will be constructed.Lignophenol have many phenolic and alcholic hydroxy groups, so we think that they works as hardner for thermosetting resins like Polyols.Then we tried to apply the Lignophenol as hardner for Polyurethane adhesives, in place of Polyols.We used the mixtures of Ligophenols, Polyols and isocyanates as adhesives, and mesured the tensile strength of glued test pieces.As a result, the Lignophenol-modified Polyurethane gave 2.6 times stronger adhesives than ordinary Polyurethane.

View full abstract

The biodegradation behavior of cellulose acetate (CA; DS=2.5) films/fibers containing orthophosphoric acid (PA) was examined by a laboratory soil burial test.It was observed that the biodegradation rate of the CA films/fibers containing PA increased in comparison with that of the control CA films/fibers.In storage (relative humidity: 60%), the formation of acetic acid and the decrease in the DS, indicating the deacetvlation of CA, were observed in the case of CA containing PA.In the case of the CA-PA-polyvinylpyrrolidone (PVP) composite, the biodegradation rate was well in agreement with that of the CA containing PA.Further, the emission of acetic acid caused by the deacetylation of CA was inhibited in storage.An infrared (IR) analys is suggested that PA interacted with the acetyl group of CA in the CA-PA composite.On the other hand, in the CA-PA-PVP composite, PA interacted with the carbonyl group of PVP in preference to CA.In a water-rich environment, PA functioned as an acid catalyst, and the DS of the CA component decreased.

View full abstract