Chem. J. Chinese Universities ›› 2018, Vol. 39 ›› Issue (2): 397.doi: 10.7503/cjcu20170417
• Polymer Chemistry • Previous Articles
WANG Xuan1, JIN Tao2, WANG Haowei2, LIAO Shengzhi2, YANG Huaiyu1,*()
Received:
2017-06-29
Online:
2018-02-10
Published:
2017-12-04
Contact:
YANG Huaiyu
E-mail:hyyang@imr.ac.cn
CLC Number:
TrendMD:
WANG Xuan, JIN Tao, WANG Haowei, LIAO Shengzhi, YANG Huaiyu. Preparation and Characterization of Polysulfide Sealant Microcapsules Based on in situ Polymerization of Urea and Formaldehyde†[J]. Chem. J. Chinese Universities, 2018, 39(2): 397.
Type of dispersion stabilizer (1%, mass fraction) | Effect of emulsifying and dispersion for polysulfide sealant |
---|---|
Tween 80 | Not dispersed, and reunited after standing |
Span 80 | Spherical particles with clear boundary, but largely difference in particle size and adhesion between particles |
TX-100 | Not dispersed, agglomerated into a block after standing |
SDBS | Uniformly dispersion, the particles were spindle type |
Methylcellulose | Mostly spherical particles with clear boundary and partial particles were spindle type, small difference in particle size |
Arabic gum + gelatin | Non-uniformly dispersion, irregular shape and largely difference in particle size, partially reunited after standing |
PVA-124 | Uniformly dispersion, well-defined spherical particles with clear boundary, little difference in particle size |
PVA-1799 | Uniformly dispersion, spherical particles with clear boundary, but largely difference in particle size |
PVA-1750 | Poor dispersion, irregular shape, largely difference in particle size |
Table 1 Effect of different dispersion stabilizers on the result of emulsifying and dispersion for polysulfide sealant
Type of dispersion stabilizer (1%, mass fraction) | Effect of emulsifying and dispersion for polysulfide sealant |
---|---|
Tween 80 | Not dispersed, and reunited after standing |
Span 80 | Spherical particles with clear boundary, but largely difference in particle size and adhesion between particles |
TX-100 | Not dispersed, agglomerated into a block after standing |
SDBS | Uniformly dispersion, the particles were spindle type |
Methylcellulose | Mostly spherical particles with clear boundary and partial particles were spindle type, small difference in particle size |
Arabic gum + gelatin | Non-uniformly dispersion, irregular shape and largely difference in particle size, partially reunited after standing |
PVA-124 | Uniformly dispersion, well-defined spherical particles with clear boundary, little difference in particle size |
PVA-1799 | Uniformly dispersion, spherical particles with clear boundary, but largely difference in particle size |
PVA-1750 | Poor dispersion, irregular shape, largely difference in particle size |
Fig.3 Particle size distributions of polysulfide sealant after emulsifying and dispersing in different PVA-124 solutionsMass fraction of PVA: a. 1%; b. 1.5%; c. 1.75%; d. 2%.
Reaction temperature/℃ | Encapsulation effect of polysulfide sealant |
---|---|
25 | Completely encapsulated, well-defined spherical particles with thick wall, little wall materials precipitated |
30 | Completely encapsulated, well-defined spherical particles with thick wall, little wall materials precipitated |
40 | Partially encapsulated, poor spherical particles with thin wall, little wall materials precipitated |
50 | Encapsulated, particle shape was irregular and large materials precipitated |
60 | Completely encapsulated, spherical particles with thin wall, large wall materials precipitated |
80 | Partially encapsulated, spherical particles with thin wall, large wall materials precipitated |
Table 2 Encapsulation effect of polysulfide sealant at different reaction temperature
Reaction temperature/℃ | Encapsulation effect of polysulfide sealant |
---|---|
25 | Completely encapsulated, well-defined spherical particles with thick wall, little wall materials precipitated |
30 | Completely encapsulated, well-defined spherical particles with thick wall, little wall materials precipitated |
40 | Partially encapsulated, poor spherical particles with thin wall, little wall materials precipitated |
50 | Encapsulated, particle shape was irregular and large materials precipitated |
60 | Completely encapsulated, spherical particles with thin wall, large wall materials precipitated |
80 | Partially encapsulated, spherical particles with thin wall, large wall materials precipitated |
pH | Encapsulation effect of polysulfide sealant |
---|---|
2 | Completely encapsulated, well-defined spherical particles with thick wall, but large precipitation and low utilization for the wall materials |
2.5 | Completely encapsulated, well-defined spherical particles with thick wall, but large precipitation and low utilization for the wall materials, and large difference in size |
3 | Completely encapsulated, well-defined spherical particles with thick wall and uniform size, little precipitation and high utilization for the wall materials |
3.5 | Completely encapsulated, well-defined spherical particles with thick wall and uniform size, little precipitation and high utilization for the wall materials |
4.5 | Well encapsulated, well-defined spherical particles with thick wall, but large precipitation and low utilization for the wall materials |
Table 3 Encapsulation effect of polysulfide sealant at different pH values
pH | Encapsulation effect of polysulfide sealant |
---|---|
2 | Completely encapsulated, well-defined spherical particles with thick wall, but large precipitation and low utilization for the wall materials |
2.5 | Completely encapsulated, well-defined spherical particles with thick wall, but large precipitation and low utilization for the wall materials, and large difference in size |
3 | Completely encapsulated, well-defined spherical particles with thick wall and uniform size, little precipitation and high utilization for the wall materials |
3.5 | Completely encapsulated, well-defined spherical particles with thick wall and uniform size, little precipitation and high utilization for the wall materials |
4.5 | Well encapsulated, well-defined spherical particles with thick wall, but large precipitation and low utilization for the wall materials |
Fig.5 Optical photos of microspheres prepared at different polymerization timeTime/h: (A) 2; (B) 3; (C) 4; (D) 5; (E) 6; (F) 7; (G) 8. (H) repersentative microcapsule at 8 h.
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