Glass fiber reinforced plastics (GFRP) are extensively used in many kinds of industry fields. Matrixs used are commonly unsaturated polyester resin, epoxy resin and phenolic resin. Especially, phenolic resin is expected as a matrix because of its good heat resistance, high mechanical properties and flame resistance.We have studied a new type of phenolic resin, which released no volatiles and needed no catalysts. Our objective in this study is to develop a new type of high-performance phenolic GFRP, which releases no volatiles and needs no catalysts. Bisphenol-A, based benzoxazine (B-a) as a new type of phenolic resin precursor was prepared from bisphenol-A, formaline and aniline. Matrix used was a molten mixture from B-a and bisoxazoline. Bisoxazoline is well known as a compound that can improve in interfacial bonding between matrix and fiber. GFRP laminate was reinforced by E-glass woven cloth fabric of 10 plies by hand-layup method. The surface treatment of fiber was acrylic silane-treatment. As a result, GFRP using B-a and bisoxazoline as a matrix showed higher heat resistance, tensile strength, flexural strength and especially impact strength than GFRP using a conventional bisphenol-A type novolac (BisA-N) and bisoxazoline as a matrix. The reason of this high strength of GFRP using B-a and bisoxazoline as a matrix was considered as follows: interfacial bonding strength of GFRP using B-a and bisoxazoline as a matrix was slightly weaker than that of GFRP using BisA-N and bisoxazoline as a matrix, and so stress concentration in matrix was relaxed by interfacial delamination.

View full abstract

The measuring method which determines complex modulus of elasticity such as adhesives anddamping materials has been standardized in ASTM from bending vibration test of laminatedbeams.In this study,measuring method for such modulus by a torsional vibration test waspresented,and the relative measurement of both test methods for dynamic elastic modulus of astructural adhesive was carried out.Though the application range of the above standardizedmethod was limited to soft or hard adhesive range,a reliable value determined is not obtainedbetween middle range of the adhesives.The torsion test is shown that the determination is possible for the hard adhesive from such middle range.The measurement accuracy of both testmethods is dependent on the shape and the material constants of the laminated specimen,and itcould be evaluated for the loss factor ratio of the specimen to adhesive itself.

View full abstract

A resist dot-pattern adhering on a substrate can be removed precisely by applying a certainload with an atomic force microscope tip.The applying load for the pattern destruction isreflected strongly by the adhesion force of the resist pattern.In this paper,we propose a quantitative and statistical method foranalyzing the destruction property.Concretely,the destructionproperty of KrF excimer laser chemically amplified resist is analyzed by this method.The reliability of this method is evaluated with the threshold load and the number of initial failurepatterns.The pattern collapsed easily when the cohesion strength of resist material is relativelylow,because certain pattern residue can be observedonthesubstrate.Then,thedestructionforceforArFexcimerlaserchemicallyamplifiedresistwasalsoanalyzedbythismethod.Astressdistributedinaresistpatternisalsocalculatedbythree-dimensionalfiniteelementmethod・Theresidueformationofdot-patternsisstronglyaffectedbythestressconcentrationatavicinityofinterface.

View full abstract