Some of the physical properties (average molecular weight, melting/pour point, viscosity, surface tension, foam height, cloud point and hydrophili~lipophilic balance) of the Pluronic PEO-PPO-PEO copolymers are listed in Table 1 (data supplied
by the manufacturer [18]). The cloud point,the temperature at which the copolymers phase
separate from water, ranges from approximately 10 C for copolymers with low PEO content to above 100"C for copolymers with high PEO content. The PEO content also influences
the rate of dissolution: this rate decreases as the relative proportion of the PEO block increases. The dissolution rate also decreases as the copolymer molecular weight increases for Pluronic copolymer groups with the same PPO/PEO corn
Some of the physical properties (average molecular weight, melting/pour point, viscosity, surface tension, foam height, cloud point and hydrophili~lipophilic balance) of the Pluronic PEO-PPO-PEO copolymers are listed in Table 1 (data suppliedby the manufacturer [18]). The cloud point,the temperature at which the copolymers phaseseparate from water, ranges from approximately 10 C for copolymers with low PEO content to above 100"C for copolymers with high PEO content. The PEO content also influencesthe rate of dissolution: this rate decreases as the relative proportion of the PEO block increases. The dissolution rate also decreases as the copolymer molecular weight increases for Pluronic copolymer groups with the same PPO/PEO corn
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