Preparation Of Polymer Latex And Study On Structure-property Relation Of Latex Particle Morphology And Pressure-sensitive Properties

The control of polymer latex particle morphology is an essential part of producing high quality latex products. Improved or peculiar pressure-sensitive property can be gain by building different polymer latex morphology. Structure-property relations of polymer latex particle morphology and pressure-sensitive properties are built throuth study on the relations of polymer latex particle morphology and rheological property through TEM and AR-2000(25℃, frequency conversion from 0.01Hz-100Hz) and analysis the relation of pressure-sensitive property and rheological property of polymer films.Study on the relations of polymer latex particle morphology and rheological property, get fine correspondence relation: 1) Phase-separation effect can lead to the system's untie-entanglement ability coming down, behaving the bigger G' (storage modulus) , and lead to inner friction enhances when feasible chain section moves, behaving the bigger G" (loss modulus) . Phase-separation effect is creasing, following the bigger G' or G". 2) The bigger phase-seperation effect, the slower the increasing speed of G' or G", which will increasing when the frequency is increasing. That means to the better balance of the system's elasticity and viscidity. 3) Phase-separation effect, which can lead to the system untie-entanglement abiligy coming down and inner friction enhances when fesible chain section moves, lead to the lower ability of molecule tropism, behaving more viscosity. The bigger phase-separation effect, viscosity will be bigger and the decrease of viscosity will be more quickly with the increasing of frequency.Based on rheology theory, to establish the structure-property relations of polymer latex particle morphology and pressure-sensitive property: 1) Initial adhesion has inverse correlation with G'(0.01Hz) and was effected by tand (loss factor) . When the G'(0.01Hz) beyond 10~5Pa, the system has no adhesion. Phase-separation effect is unfarorable to the initial adhesion. But when the homogeneous phase system has no adhesion, Phase-separation effect will make the system having adhesion.2) Peel strength has positive correlation with G"(100Hz), and was effected by G'(0.01Hz) and tand. Phase-separation effect is farorable to peel strength and but should not be too large. 3) Cohesion has positive correlation with viscosity(0.01Hz) and was effected by tand. Phase-separation effect is farorable to cohesion and but should not be too large.