Adhesiveness of Dissimilar Materials～ Analysis and Evaluation for Material Interface ～In terms of ADHESION of polymer with other materials (polymer, metal), characteristics of polymer have agreat impact on adhesiveness. In case polymer has reactive functional groups, structural analysis of adhesiveinterface is highly effective. In other case of crystalline polymer, crystallinity evaluation of interface can befound as correlational results with adhesiveness.

Major Factor and Analysis for AdhesivenessMolecularDiffusion

MechanicalInterface adhesion Chemically bonded An adhesive soakby intermolecular interface byinto fine microstructure offorces
functional groupmaterial surface

Van der Waals Force（exist on all material interface）

Mechanical

ChemicalChemicalPhysicalPhysicalAnchoring effectCovalent bondHydrogen bond Molecular Diffusion++-+Surface / Interface Analysis

+-C

C

CC

B

B

B

B

A

A

A

A

Methods

molecular chain
entangle andcompatible to
make interface

Adhesive Factor

Components, Chemical Formula

XPS, TOF-SIMS, FT-IR

Physical, Chemical

Shape of Fine Structure
Crystallinity

SEM, TEM, AFM, DSC,
X-ray Diffraction, RamanMechanical, Physical,
Molecular Diffusion

Wettability, Surface Free Energy

Contact Angle

Physical, Mechanical, Chemical■Specimen【FT-IR-ATR Spectra】- Adhesive︓Epoxy(2 component)- Substrate︓PA (Nylon6) 0.2
Absorbance■Preparation(1) Coat epoxy on PA(2) Heat 1h @120℃(3) Polish and observe
interface
ATR
Crystalline
Epoxy
PA

νC=O
（PA）

δN-H
（PA）

O

（Ep）

PA（Ep）
PA

0.1

0.00.002

Ep1700 1600 1500 940
900
Wavenumber (cm-1)

EpEpoxy Reaction Ratio（%）

Polymer / Polymer - Status of Chemical Bond at Interface Epoxy/PAInterface

100 Epoxy innerLayer
95

Reaction ratio of epoxy atinterface of PA is 5% higher
than that of epoxy inner layer.
It is considered epoxy and PA
were bonded by amide groupat interface.
C NO HAmidegroup90
Depth < 700nm

85
80

400
Depth（μm）

C N

H2C CHOO CH2HC O C CH2 N
OInsertion

HHC OHAddition

Chemical analysis of surface /interface structure is very
effective for molecular design
1.000.5
Abs. Intensity Ratio of Adhesive having reactive（A1545:PA/A1510:Ep） functional group.
Epoxy
side0+PAsideMetal / Polymer - Crystallization of Interface Influence for Adhesiveness 【Polarizing Microscope Observation (Crossed Nicol)】- Al foil (12 micron)- PET film (200 micron)■Preparation(1) Melt PET @295℃(2) After fused on Al foil,①Quenching②Quenching &reheating 1h @130℃③Slow cooling

PETTm 263℃
Tg 69℃②③The larger Spherulites
become, the lower theadhesiveness is. It is
20μm
considered size/densityof spherulites
relate to①amorphous、②&③Spherulites in different size observed
mechanical properties of0.160.12
polymer and internal stress derived fromspherulites formation have some impact on（Breaking Al Foil）
0.12
adhesiveness.
0.08
In the case of crystalline thermoplastic resin
0.08 Increasing(PE, PP, PET, PPS, PEEK), crystalline growth
Folding Structure
at the temp. of quenching or operating
0.04(Lamellar)
Decreasing
0.04
have a great impact on adhesiveness.
Adhesiveness
It is important to understand precisely
0.00
0.00
thermal properties of polymer (Tm, Tg, Tc)③Slow②Quenching①Quenchingand consider operating conditions.
Cooling& Reheating（A989:folding structure/A793:Aromatic）

Al
Al

Abs. Intensity Ratio（IR)PET①【Schematic Diagram of Spherulites】
Amorphous Lamellar

Adhesiveness（kN/m）■Specimen

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