English
中文简体The reason why silicone fresh-keeping cover are still elastic at low temperatures involves the unique molecular structure and physical properties of the silicone material. The following are several key factors that explain in detail why silicone cover can maintain elasticity in low temperature environments:
First of all, the molecular chain structure of silica cover is linear and flexible. Silica cover is a chain structure formed by alternating arrangements of silicon (silicon element) and oxygen (oxygen element). This structure gives silicone cover superior flexibility. At normal temperature, the silica cover molecular chains can move and bend freely, making the silica cover material exhibit good elasticity. When the temperature decreases, although the molecular chains are affected by freezing, due to the high degree of freedom of the silica cover chains, they can still maintain relative flexibility in low temperature environments and prevent hardening and embrittlement.
Secondly, silicone materials are not prone to glass transition at low temperatures. Vitrification is a phenomenon in which solid materials transform from a solid state to a glass-like amorphous state at low temperatures. Due to the special properties of its molecular chain structure, silica cover is not prone to obvious vitrification. This allows the silicone fresh-keeping cover to maintain high molecular fluidity at low temperatures, maintain sufficient elasticity, and not easily become brittle and hard.
In addition, the chemical bond structure of silica cover materials is stable. The silicon-oxygen bond (Si-O bond) in silica cover is a very stable chemical bond and is relatively insensitive to temperature changes. This stability makes the silica cover molecular chain less likely to break or undergo drastic structural changes in low temperature environments, helping to maintain the overall elasticity of the silica cover fresh-keeping cover.
In addition, the intermolecular forces of silica cover materials are weak. The interaction force between silica cover molecules is small, which allows the silica cover molecules to still move and rotate relatively freely in a low temperature environment, and the material will not become stiff due to excessive mutual attraction.
The main reason why the silicone fresh-keeping cover is still elastic at low temperatures is its unique molecular chain structure, anti-vitrification ability, stable chemical bond structure and weak intermolecular forces. These properties work synergistically to enable the silicone lid to maintain its original elasticity in extremely low temperature environments, thereby ensuring reliability and durability in the frozen food preservation process.
