Matches in SemOpenAlex for { <https://semopenalex.org/work/W617422689> ?p ?o ?g. }
Showing items 1 to 83 of
83
with 100 items per page.
- W617422689 abstract "This thesis considers the effect of manufacturing conditions and polymer ratio on water permeability and morphology of free-films. A novel spray method for producing ethyl cellulose (EC) and hydroxypropyl cellulose (HPC) free-films was developed where several process parameters was controlled. The process was optimised by pre-spraying solvent until the system reached a steady-state temperature. This minimised the variation of outlet air temperature to < 2.5 °C. Coating time was approximately 4 minutes excluding drying. Free-films were produced using 94 wt% solvent (95 %-ethanol) and 6 wt% polymer. The amount of HPC in the films was varied (wt% HPC defined as HPC/(HPC+EC)*100). Films with 30-40-50-57 wt% HPC were studied. Phase diagrams was constructed to study the phase transformation of polymer mixtures. Results show that all polymer mixtures with HPC content above 30 wt% were phase separated prior to film manufacturing. Temperature had an effect on the polymer phase transformation. In the phase diagram, the 2-phase area was larger for temperatures above 40 °C. The investigated manufacturing conditions were outlet air temperature (°C) and spray rate (g/min). Outlet air temperature was controlled by adjusting the inlet air temperature. The films were characterized by measuring water permeability (m2/s). Cross section structure of the films was analyzed with confocal laser scanning microscopy (CLSM). FITC-HPC was added for enhanced contrast between the domains. Higher outlet air temperature gave higher water permeability of the film whereas higher spray rate gave lower water permeability. The outlet air temperature had an impact on evaporation rate. The evaporation rate together with spray rate affected the solidification and hence the structure of the film. Images show that longer solidification time smeared the domains into larger domains. Lower water permeability was caused by less connectivity between the pores. In conclusion, experiments show that water permeability of EC/HPC free-films was highly dependent on the manufacturing conditions." @default.
- W617422689 created "2016-06-24" @default.
- W617422689 creator A5067653354 @default.
- W617422689 date "2009-01-01" @default.
- W617422689 modified "2023-09-27" @default.
- W617422689 title "Effect of manufacturing conditions and polymer ratio on the permeability and film morphology of ethyl cellulose and hydroxypropyl cellulose free-films produced by using a novel spray method." @default.
- W617422689 cites W1991247114 @default.
- W617422689 cites W2022109236 @default.
- W617422689 cites W2091878648 @default.
- W617422689 cites W301945428 @default.
- W617422689 hasPublicationYear "2009" @default.
- W617422689 type Work @default.
- W617422689 sameAs 617422689 @default.
- W617422689 citedByCount "0" @default.
- W617422689 crossrefType "journal-article" @default.
- W617422689 hasAuthorship W617422689A5067653354 @default.
- W617422689 hasConcept C113196181 @default.
- W617422689 hasConcept C114932410 @default.
- W617422689 hasConcept C120882062 @default.
- W617422689 hasConcept C127413603 @default.
- W617422689 hasConcept C159985019 @default.
- W617422689 hasConcept C178790620 @default.
- W617422689 hasConcept C185592680 @default.
- W617422689 hasConcept C188027245 @default.
- W617422689 hasConcept C192562407 @default.
- W617422689 hasConcept C2776035855 @default.
- W617422689 hasConcept C2779227376 @default.
- W617422689 hasConcept C2779251873 @default.
- W617422689 hasConcept C2781218482 @default.
- W617422689 hasConcept C2781448156 @default.
- W617422689 hasConcept C41625074 @default.
- W617422689 hasConcept C42360764 @default.
- W617422689 hasConcept C43617362 @default.
- W617422689 hasConcept C44280652 @default.
- W617422689 hasConcept C521977710 @default.
- W617422689 hasConcept C55493867 @default.
- W617422689 hasConceptScore W617422689C113196181 @default.
- W617422689 hasConceptScore W617422689C114932410 @default.
- W617422689 hasConceptScore W617422689C120882062 @default.
- W617422689 hasConceptScore W617422689C127413603 @default.
- W617422689 hasConceptScore W617422689C159985019 @default.
- W617422689 hasConceptScore W617422689C178790620 @default.
- W617422689 hasConceptScore W617422689C185592680 @default.
- W617422689 hasConceptScore W617422689C188027245 @default.
- W617422689 hasConceptScore W617422689C192562407 @default.
- W617422689 hasConceptScore W617422689C2776035855 @default.
- W617422689 hasConceptScore W617422689C2779227376 @default.
- W617422689 hasConceptScore W617422689C2779251873 @default.
- W617422689 hasConceptScore W617422689C2781218482 @default.
- W617422689 hasConceptScore W617422689C2781448156 @default.
- W617422689 hasConceptScore W617422689C41625074 @default.
- W617422689 hasConceptScore W617422689C42360764 @default.
- W617422689 hasConceptScore W617422689C43617362 @default.
- W617422689 hasConceptScore W617422689C44280652 @default.
- W617422689 hasConceptScore W617422689C521977710 @default.
- W617422689 hasConceptScore W617422689C55493867 @default.
- W617422689 hasLocation W6174226891 @default.
- W617422689 hasOpenAccess W617422689 @default.
- W617422689 hasPrimaryLocation W6174226891 @default.
- W617422689 hasRelatedWork W1964181333 @default.
- W617422689 hasRelatedWork W1969970923 @default.
- W617422689 hasRelatedWork W1983706640 @default.
- W617422689 hasRelatedWork W2004756187 @default.
- W617422689 hasRelatedWork W2014072004 @default.
- W617422689 hasRelatedWork W2017180780 @default.
- W617422689 hasRelatedWork W2019512861 @default.
- W617422689 hasRelatedWork W205202213 @default.
- W617422689 hasRelatedWork W2056578175 @default.
- W617422689 hasRelatedWork W2060265200 @default.
- W617422689 hasRelatedWork W2065535986 @default.
- W617422689 hasRelatedWork W2069000124 @default.
- W617422689 hasRelatedWork W2073881125 @default.
- W617422689 hasRelatedWork W2075744168 @default.
- W617422689 hasRelatedWork W2089896242 @default.
- W617422689 hasRelatedWork W21206310 @default.
- W617422689 hasRelatedWork W2352846039 @default.
- W617422689 hasRelatedWork W2371317311 @default.
- W617422689 hasRelatedWork W2600158303 @default.
- W617422689 hasRelatedWork W908527163 @default.
- W617422689 isParatext "false" @default.
- W617422689 isRetracted "false" @default.
- W617422689 magId "617422689" @default.
- W617422689 workType "article" @default.