Interface porcelain tile/PVA modified mortar: a novel nanostructure approach.

Ceramic tile systems rely on strong adhesion between porcelain tiles and polymer-modified mortars. Prior research has shown that adhesion is influenced by surface chemistry and interfacial structures. However, the exact role of polymer additives in enhancing adhesion remains unclear. This gap motivated researchers to explore how polymer additives like PVA influence the interface at the nanoscale. Existing studies have focused on macro-level adhesion but not on the nanostructured mechanisms. No prior work had resolved how PVA affects interfacial hydrogen bonding. This uncertainty drove the investigation into nanostructure formation. The goal was to understand how PVA contributes to adhesion at the tile-mortar interface. This paper's contribution is a detailed analysis of the nanostructure formed by PVA in the interface.

The aim of this study was to investigate how PVA improves adhesion between porcelain tiles and polymer-modified mortars. The specific problem addressed is the lack of understanding about how polymer additives affect the interface at the nanoscale. The motivation came from the need to improve ceramic tile adhesion through better material design. The researchers sought to determine if PVA enhances adhesion by forming a hybrid interface. They focused on hydrogen bonding between PVA and tile surfaces. The study also aimed to identify the role of nanostructured C-S-H gel interlayers. By analyzing interface structures, the team hoped to explain adhesion mechanisms. This approach could lead to better tile-mortar systems in construction.

The study used pull-off tests to measure adhesion strength between porcelain tiles and PVA-modified mortars. Scanning Electron Microscopy (SEM) was employed to visualize the interface at high resolution. Small Angle X-ray Scattering (SAXS) experiments were conducted to analyze nanostructure formation. The researchers examined how PVA interacts with the tile surface and mortar. They focused on hydrogen bonding between PVA hydroxyl groups and silanol groups on the tile. Water molecules in the nanostructured C-S-H gel interlayer were also studied. The team combined mechanical testing with imaging and scattering techniques. This approach allowed them to link structural changes to adhesion performance.

The strongest finding was that PVA increases adhesion by forming a hybrid ceramic-polymer-ceramic interface. SEM images showed a more uniform interface with PVA addition. SAXS experiments confirmed the formation of nanostructured C-S-H gel interlayers. Pull-off tests demonstrated higher adhesion strength when PVA was used. Hydrogen bonds between PVA hydroxyl groups and silanol groups were identified as key contributors. Water molecules in the interlayer also played a role in bonding. The hybrid interface improved mechanical stability between tile and mortar. These results suggest that PVA enhances adhesion through both chemical and structural effects.

The authors propose that PVA improves adhesion by forming a hybrid interface through hydrogen bonding. The study suggests that nanostructured C-S-H gel interlayers are essential for adhesion. SEM and SAXS data support the idea that PVA modifies the interface at the nanoscale. The findings suggest that PVA enhances adhesion without altering the tile or mortar composition. The hybrid interface model explains how PVA contributes to stronger bonding. The study does not claim that PVA is the only factor affecting adhesion. It suggests that water in the interlayer also plays a role in bonding. These conclusions are based on the observed structural and mechanical changes.