形成及相互关系
打程子
合等中
初数粒子的核
20m「pC分子链集或品
聚氯乙婚的熔化过程,是在热及剪切力的
作用下形成的多层次
粒子不断破裂、不断变化的过程,助剂的种类和数量、设备的塑化
能力、加工工艺参数都会影响粒子的这一变化过程,而聚氯乙烯本
身质量如颗粒形态结构规整,粒径分布较,能使工艺参数控制恒
定,加工过程平稳,产品质量稳定。通常氯乙烯粒子结构疏松
孔晾率高、皮膜薄,且粒径较小的树脂,吸收增塑剂能力强、速率
快,容易塑化,加工性能好
聚氯乙烯配方混合及以容积计量的加工中,较为理想的是具有
规整、均匀面且适当大小粒径的树脂,颗粒过细的树脂易造成粉尘
飞扬和容积计量困难,相反,粒径过粗,也会带来包装和贮存的不
便,还会使加工设备效率过低
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pvc聚氯乙烯结晶
氯乙烯树脂早期被认为是无定形聚合物,但后来在科学仪器
的帮助下,人们发现有少量晶体存在于聚氯乙烯树脂中,一般估计
聚氯乙烯结晶度为5%~10%。Nata在研究聚氯乙烯定向纤维时
得出结论,聚氯乙烯晶体是正交晶系,其晶体尺寸为a=
1.024m,b=0.524nm,c-0.508mm,这些微品是问规立构型
段的有序排列,它是在粒径为23nm的区域结构内生成的品片,品
片厚度为1.0~1.5m,宽度为5~10mm,其余区城为无序排列的
链段。此结构似乎难以令人置信,但是用此结构模型可成功解释X
射线宽角散射(WAXS)、小角X射线散射(SAXS)和小角可见光散射(SALS)的数据。在聚合初期,聚氯乙烯大分子浓度很低
Formation and interrelationship
A number of days
In the us such as
The nucleus of the elementary particle
20m "pC molecular chain set or product
The melting process of polyvinyl chloride is under thermal and shear forces
Under the action of the formation of a multi-level
Particle breaking, changing process, type and quantity of additives, plasticization of equipment
Ability, processing parameters will affect the particle of this change in the process, and polyvinyl chloride this
If the body mass is regular as the particle shape structure, the particle size distribution is relatively, the process parameters can control constant
Ding, the processing process is stable, product quality is stable.The particle structure of vinyl chloride is usually loose
The resin with high hole air ratio, thin film and small particle size has strong ability to absorb plasticizer and high speed
Fast, easy to plasticize, good processing performance
Polyvinyl chloride formula mixing and volumetric processing, the more ideal is with
Regular, uniform and appropriate size of the size of the resin, resin particles too fine particles easy to cause dust
Flying and volume measurement is difficult, on the contrary, particle size is too thick, will also bring packaging and storage
Then, will also make processing equipment efficiency too low
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PVC crystallization
Vinyl chloride resins were early considered amorphous polymers, but later in scientific instruments
With the help of general estimates, it has been found that there are small amounts of crystals present in polyvinyl chloride resins
The crystallinity of PVC is 5%~10%.Nata in the study of oriented polyvinyl chloride fibers
It is concluded that polyvinyl chloride crystal is an orthorhombic system, and its crystal size is a=
1.024m,b=0.524nm,c-0.508mm, these micro-products are of stereoscopic configuration
The ordered arrangement of segments, which is the product sheet generated in the regional structure with particle size of 23nm
The thickness of the slice is 1.0~1.5m, the width is 5~10mm, and the rest areas are disordered
Chain segments.This structure seems incredible, but this structural model successfully explains X
Data of X-ray wide Angle scattering (WAXS), small Angle X-ray scattering (SAXS) and small Angle visible light scattering (SALS).At the beginning of polymerization, the concentration of polyvinyl chloride macromolecules was very low
