Solvent-free and highly branched water-soluble polyester (WPET) is prepared through self-emulsification methodology, using dimethyl terephthalate (DMT), sodium dimethyl isophthalate-5-sulfonate (SIPM), trimethylolpropane (TMP), and ethylene glycol (EG) by the transesterification and polycondensation. The WPET were first utilized as surface-sizing agents for cellulose fiber paper. The structure, average molecular weights, and physical properties of the water-soluble polyester were characterized by FTIR, 1 H NMR, gel permeation chromatography (GPC), dynamic light scattering (DLS), X-ray diffraction (XRD), and dynamic rheometer. The effects of polymer structure and properties, as well as the surface sizing of the paper, were investigated. WPET displayed better surface sizing properties when it was prepared under the following conditions: –COO/–OH molar ratio of 1:2, the SIPM content of 17.98%, and TMP content of 11.10%. The relationships between the WPET structure and sized paper were clearly illustrated. The mechanical properties and water resistance of sized paper did not only depend on multi-branched hydroxyl groups of the WPET chains but also relied on the interactions among polymers and fibers, as well as the high toughness of surface sizing agent. The sizing paper possesses excellent mechanical properties as well as water resistance.
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机译：通过自乳化方法，使用二甲酯（DMT），二甲基苯甲酸钠-5-磺酸钠（SIPM），三羟甲基丙烷（TMP）和乙二醇（例如）通过自乳化方法制备无溶剂和高度支化的水溶性聚酯（WPPET）。通过酯交换和缩聚。该WPET首先用作纤维素纤维纸的表面尺寸调味剂。通过FTIR，1 H NMR，凝胶渗透色谱（GPC），动态光散射（DLS），X射线衍射（XRD）和动态流变仪表征水溶性聚酯的结构，平均分子量和物理性质。 。研究了聚合物结构和性质的影响以及纸张的表面尺寸。在下列条件下制备时，WPET显示出更好的表面施胶性能：-OO / -OH摩尔比为1：2，SIPM含量为17.98％，TMP含量为11.10％。清楚地说明了WPET结构和大小纸张之间的关系。尺寸纸的机械性能和耐水性不仅取决于WPET链条的多支化羟基，而且依赖于聚合物和纤维之间的相互作用，以及表面上浆剂的高韧性。施胶纸具有优异的机械性能以及耐水性。
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