Influences of diallyl phthalate as chain extender on the properties of high molecular weight poly(vinyl chloride) resin

2017 ◽  
Vol 134 (29) ◽  
pp. 45093
Author(s):  
Jianning Wu ◽  
Baoxun Sui ◽  
Lei Li ◽  
Guihua Meng ◽  
Xuhong Guo ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Vinyl Chloride ◽  
Chain Extender ◽  
Poly Vinyl Chloride ◽  
Diallyl Phthalate ◽  
High Molecular Weight Poly

scholarly journals Orientation of Poly(ε-caprolactone) in Its Poly(vinyl chloride) Blends Crystallized under Strain: The Role of Strain Rate

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5655
Author(s):  
Ruru Wan ◽  
Xiaoli Sun ◽  
Zhongjie Ren ◽  
Huihui Li ◽  
Shouke Yan
Keyword(s):  
Molecular Weight ◽  
Strain Rate ◽  
High Molecular Weight ◽  
Vinyl Chloride ◽  
Draw Ratio ◽  
Bulk Sample ◽  
Axis Orientation ◽  
Poly Vinyl Chloride ◽  
Before And After

The blends of high and low molecular weights poly(ε-caprolactone) (PCL) with poly(vinyl chloride (PVC) were prepared. The samples before and after the crystallization of PCL were uniaxially stretched to different draw ratios. The orientation features of PCL in a stretched crystalline PCL/PVC blend and crystallized from the amorphous PCL/PVC blends under varied strains were studied by wide-angle X-ray diffraction (WAXD). It was found that a uniaxial stretching of crystalline PCL/PVC blend with high molecular weight PCL results in the c-axis orientation along the stretching direction, as is usually done for the PCL bulk sample. For the stretched amorphous PCL/PVC blend samples, the crystallization of high molecular weight PCL in the blends under a draw ratio of λ = 3 with a strain rate of 6 mm/min leads to a ring-fiber orientation. In the samples with draw ratios of λ = 4 and 5, the uniaxial orientation of a-, b-, and c-axes along the strain direction coexist after crystallization of high molecular weight PCL. With a draw ratio of λ = 6, mainly the b-axis orientation of high molecular weight PCL is identified. For the low molecular weight PCL, on the contrary, the ring-fiber and a-axis orientations coexist under a draw ratio of λ = 3. The a-axis orientation decreases with the increase of draw ratio. When the λ reaches 5, only a poorly oriented ring-fiber pattern has been recognized. These results are different from the similar samples stretched at a higher strain rate as reported in the literatures and demonstrate the important role of strain rate on the crystallization behavior of PCL in its blend with PVC under strain.

Linear and high-molecular-weight poly-porphyrins for efficient photodynamic therapy

2021 ◽  
Author(s):  
Nan Zheng ◽  
Xiahui Li ◽  
Shangwei Huangfu ◽  
Kangkai Xia ◽  
Ruofei Yue ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Photodynamic Therapy ◽  
Quantum Yield ◽  
Singlet Oxygen ◽  
High Molecular Weight ◽  
Linear Poly ◽  
High Molecular Weight Poly

A linear poly-porphyrin with high Mw and conjugated by PEG and acetazolamide was developed with enhanced singlet oxygen quantum yield, improved photo-toxicity and excellent in vivo photodynamic therapy.

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