In this study,paper with different physicochemical properties were prepared by using different types of pulp fibers with different degrees of pulping treatment and silane modification to regulate the three-dimensional structure of paper.From the viewpoint of the effects of fiber physical properties and chemical hydrophobic modifications on paper structure,the effects of fiber properties(beating degree,fi-ber length and distribution,water retention value,fiber morphology and hydrophilic/hydrophobic property)on the water vapor barrier per-formance of paper were investigated.The results showed that the water vapor barrier performance of the paper was influenced by the beat-ing degree and hydrophilic/hydrophobic of the fibers.Under the testing conditions of(23±0.5)℃ and(50±1)％RH,the water vapor trans-mission rate of the paper with a basis weight of 60 g/m2 was reduced from 954.5 to 93.77 g/(m2·d),when the beating degree of the un-bleached pine pulp was increased from 13.5 to 90 °SR.The water vapor transmission rate of the paper prepared by hydrophobic modified fiber was reduced by 11.6％compared with that of unmodified fiber when the test conditions were(23±0.5)℃ and(75±1)％RH.The wa-ter vapor transmission rate of paper was influenced by the mixing proportion of hydrophobic modified fiber.
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