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Molecular weight is another crucial factor; as the molecular weight of HPMC increases, Tg tends to increase. This is because higher molecular weight polymers have longer chains that are entangled, leading to a more rigid structure. Additionally, the presence of plasticizers, such as glycerin or polyethylene glycol, can significantly lower the Tg of HPMC by increasing chain mobility.
hpmc glass transition temperature

Another significant benefit of redispersible polymer powders is their water resistance. This is particularly important for exterior applications or in areas with high moisture exposure. By incorporating these polymers, the modified mixes exhibit a lower permeability, which helps to protect the underlying structures from moisture damage. This enhanced durability is critical for ensuring the longevity and performance of building materials.
redispersible polymer powder wiki
