Effect of Added Poly （vinyl pyrrolidone） during Condensation on Properties of Poly（p-phenylene terephthalamide）Pulp

Poly (p-phenylene terephthalamide) (PPTA) pulp was prepared by polycondensation of the p-phenylene diamine (PPDA) with terephthaloyl chloride (TPC) in the completely anhydrous solvent system of N-methyl pyrrolidone (NMP) having calcium chloride, in the presence of poly (vinyl pyrrolidone) (PVP) having a viscosity average molecular weight lower than 40 000. It was confirmed that the polycondensation could be accelerated, the inherent viscosity of the polymer could be increased, and the polymers could be fibrillated more easily by the addition of the PVP. FTIR and X-ray spectra proved that PVP had not combined into molecular chains of the resultant PPTA pulps. The morphology of the resultant pulps, the effect of viscosity average molecular weight, amount and adding mode of PVP on inherent viscosity, specific surface area,and mean length of the resultant pulps were discussed in detail. And the friction and wear properties of the compound reinforced by the resultant pulps were simply investigated.     

外伤性脱位牙保留牙髓再植术的临床研究

探讨外伤性脱位牙保留牙髓再植术的临床治疗效果。对97颗不同类型的外伤性脱位牙采用保留牙髓植术．并对治疗方法和治疗效果进行综合分析。结果表明，外伤性脱位牙保留牙髓再植术后，牙髓愈合率为34．02％，正常牙周膜愈合率为55．67％，根管治疗率为62．89％，牙根吸收率为44．33％。可见外伤性脱位牙保留牙髓再植术可获得较高的牙髓愈合率，最大限度地保留活髓，牙周膜愈合率也得到提高，从而提高了患牙的长期保存率。     

脱果胶试剂在全棉秆化机浆漂白中的应用

通过原子吸收分光光度计(FAAS)对原料中金属离子含量进行定量分析.以果胶酸钙为模型物,考察氢氧化钠、草酸钠等脱果胶试剂对棉秆皮部的果胶脱除及化学成分的影响,进而探讨改进全棉秆化机浆成浆性能的方法.实验结果表明:各脱果胶试剂与果胶酸钙模型物反应速率的关系为2 2 43 4Na C O NaOHNa POv>v>v;用3%草酸钠进行皮部预处理,棉秆皮部果胶脱除率可达到53.72%.对全棉秆化机浆漂白结果显示,当温度90,℃、草酸钠用量3%的预处理条件下,以6.5%NaOH和11%H2O2制得全棉秆化机浆白度可以达到76.2%,尘埃度可降至50.10,mm2/m2.     

KRAFT WOOD PULP TCF AND ECF BLEACHING WITH ENZYME PRETREATMENT *

针叶木硫酸盐浆用木聚糖酶Ｉｒｇａｚｙｍｅ４０＿Ｘ４进行预处理,然后进行各种无元素氯（ＥＣＦ）和全无氯（ＴＣＦ）漂白．实验结果表明,酶预处理能提高后续漂白效果,提高白度,降低卡伯值,并改善纸浆的粘度,在不用元素氯的情况下,能将纸浆漂白到８８％ＩＳＯ以上的白度     

越南甜竹制浆漂白性能的研究

以越南甜竹为研究对象,经KP法蒸煮后,进行 DEpQP漂白,系统分析了其制浆漂白性能。KP法蒸煮适宜工艺条件为:碱(NaOH计)、硫、AQ质量分数分别为22%、20%、0.1%,液比为1∶4,最高温度为170℃,保温时间120min. 蒸煮结果为:粗浆得率381%, Kappa值1847,白度2525%(ISO)。采用单因素法研究DEpQP漂白中D段ClO2、Ep段H2O2、P段H2O2的最佳用量,漂白结果为:卡伯值114,白度 7932%(ISO),黏度9314mL/g.     

无机电解质对淀粉在纸浆上吸附的影响

考察了无机电解质 Na Cl、Na2 SO4 和 Al2 ( SO4 ) 3 对淀粉在混合木浆和麦草浆上吸附的影响 .实验结果表明 :在使用的盐浓度范围内 ,无机盐的存在可促进原淀粉在两种浆上的吸附 ,但大幅减小阳离子淀粉的吸附率 .三种无机电解质对淀粉吸附的影响也各不相同 .这些结果能被氢键作用机理、邻位水层模型和DLVO理论解释     

麦草浆造纸废液制木材胶粘剂的研究

使纸浆造纸废液自然发酵，用经过发酵的木素，按常规的制胶工艺制取木素酚醛树脂胶，并研究其胶合性能。     

纸制缓冲材料的研究与开发

介绍了纸浆模、瓦楞纸板、纸管和再生纸等纸制缓冲材料的性能和特点，经初步实验研究，表明以纸制缓冲材料代替聚苯乙烯发泡塑料缓冲材料是完全可能的。     

果浆发酵生产苹果酒的研究

以红富士苹果为原料,探讨了果浆酿制苹果酒的生产工艺和成品品质,研究发酵过程中酒精度、糖度的变化。确定了果浆发酵苹果酒的工艺流程和生产条件,制得的成品中含有丰富的氨基酸、维生素和矿物质,酒味浓郁,口感丰润,色泽金黄清亮,为今后苹果果浆发酵酒的工业化生产提供了一定的理论基础和实验数据。     

PREPARATION AND APPLICATION OF COPOLYMERS OF 2-ACRYLAMIDO-2-METHYL PROPANE SULFO ACID AS WASTE WATER TREATMENT AGENTS

1INTRODUCTION2-acrylamido-2-methyl propane sulfo acid (AMPS), i.e. butyl acrylamido sulfo acid, is a kind of acrylamido anionic monomers. Its structure is shown below.AMPS is widely applied in oil chemicals, waste water treatment, paper making, spin, plastics dyeing, dope leather and so on. Thereinto, the waste water treatment is one of the great application fields of AMPS. Copolymers with acrylamide can be used as dewatering agents to purify waste water, wipe-off bilge agents of cale…