摘要:

AbstractThe molecular structure of diphenylmethyl methacrylate has been determined by means of X‐ray diffraction. Crystals are monoclinic, space groupC2/c,a= 29, 177 (2),b= 6,017(1),c= 16,110(1) Å, β = 96,840(5)°, andZ= 8. The structure was solved by the direct method and refined by the block‐diagonal least‐squares procedure toR= 0,071 (Rw= 0,091) for 1768 measured reflections. The molecule has anantiperiplanarconformation as to the CC and CO double bonds about the C(1)C(2) bond and asynperiplanarconformation as to the CO and CO bon

ISSN:0025-116X    

DOI:10.1002/macp.1982.021831121

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe incorporation ofN,N‐dimethylacrylamide (DMA) as a comonomer in polyethylene yields a material possessing dramatically improved mechanical compatibility with poly(vinyl chloride) (PVC). At increased levels of DMA (25–30 wt.‐%) miscibility with PVC is achieved. This behavior is believed to be due to the specific interaction of the tertiary hydrogen of poly(vinyl chloride) (weak “acid” or proton donor) with the disubstituted amide in the ethylene copolymer (weak “base” or proton acceptor). Dynamic mechanical characterization of the ethylene/DMA copolymer (EDMA)/PVC blends reveals separate glass transitions temperatures at DMA levels below 20 wt.‐%; they merge into a singleTgwhen the DMA content reaches a value above 25 wt.‐% in the ethylene copolymer. The secondary loss transition for PVC (−40°C) is lowered in temperature and greatly suppressed in magnitude. This is further evidence of molecular miscibility. Mechanical property data obtained on the EDMA/PVC blends are consistent with the fore

ISSN:0025-116X    

DOI:10.1002/macp.1982.021831122

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

ISSN:0025-116X    

DOI:10.1002/macp.1982.021831123

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY